1. The fermentation process of the white vinegar is characterized by comprising the following steps of:

s1, alcoholic fermentation: crushing, cooking, liquefying, saccharifying and fermenting the fermentation raw materials to prepare alcohol;

s2, acetic fermentation: adding white vinegar and acetic acid bacteria suspension into alcohol, adjusting the initial fermentation alcoholic strength to 3-5%, total acid to 5-7g/100mL, adding 8-15% of acetic acid bacteria suspension, adding 15-20% of cassava saccharification liquid of the total amount of alcohol and white vinegar, fermenting at 29-33 deg.C, ventilating at 40-60L/h, periodically detecting acetic acid content, stopping fermentation when the acetic acid content is more than 6% and the acidity growth rate is 0-0.29%, and making into semi-finished product;

s3, fixation: filtering, preparing and steaming the fermented semi-finished product to obtain the white vinegar, wherein the steaming temperature is 110-125 ℃, and the steaming time is 4-6 s.

2. The fermentation process of white vinegar according to claim 1, wherein: the fermentation raw material is rice.

3. The fermentation process of white vinegar according to claim 2, wherein: the fermentation raw materials also comprise taro, couchgrass root and water chestnut peel, wherein the addition amount of the taro is 10-20% of the rice amount, the addition amount of the couchgrass root is 5-15% of the rice amount, and the addition amount of the water chestnut peel is 15-30% of the rice amount.

4. The fermentation process of white vinegar according to claim 3, wherein: the step S1 of alcoholic fermentation specifically comprises the following steps: s11, crushing rice, mixing the crushed rice with water according to the weight ratio of 1:4-6, uniformly stirring, heating to 100-;

cleaning and peeling taro, mixing with cleaned lalang grass rhizome and corm Eleocharitis peel, pulping, performing enzymolysis on the mixed pulp, adjusting pH to 4-4.5, filtering to obtain mixed solution B, mixing the mixed solution A and the mixed solution B to obtain fermentation liquid;

s12, adding a saccharifying agent and active dry yeast into the fermentation liquor, mixing, and fermenting for 5-7 days at 25-30 ℃ to obtain the alcohol, wherein the adding amount of the active dry yeast is 0.05-0.2% and the adding amount of the saccharifying agent is 20-40% based on the weight of the fermentation raw materials.

5. The fermentation process of white vinegar according to claim 4, wherein: in the step S12, in the fermentation, saccharifying enzyme is supplemented to the fermentation liquid to make the concentration of glucose in the fermentation liquid 22-25 g/L.

6. The fermentation process of white vinegar according to claim 4, wherein: the enzymolysis method of the mixed slurry in the step S11 comprises the following steps: adding cellulase and pectase into the mixed pulp, and performing enzymolysis at 35-45 deg.C for 60-90min, wherein the cellulase is 0.07-0.1% of the mixed pulp, and the pectase is 0.1-0.15% of the mixed pulp.

7. The fermentation process of white vinegar according to claim 4, wherein the saccharifying agent is a vinegar residue saccharifying yeast, and the vinegar residue saccharifying yeast is prepared by the following method: mixing bran with water, steaming and boiling for 30-50min under normal pressure, cooling, mixing with vinegar residue, adding sweet potato Aspergillus AS3.324 accounting for 3-5% of the mass of the bran and Aspergillus niger accounting for 3-5% of the mass of the bran, mixing uniformly, culturing at constant temperature of 30-35 ℃ for 27-32h, and drying to obtain the vinegar residue saccharified yeast, wherein the mass ratio of the bran to the vinegar residue is 1: 1.25-2.5.

8. The fermentation process of white vinegar according to claim 1, wherein the cassava saccharification liquid is prepared by pulverizing cassava, adding water, mixing, heating to 85-90 deg.C, maintaining for 10-20mi, cooling, adding 0.01-0.05 wt% of saccharifying enzyme, and saccharifying at 60-65 deg.C for 30-40 min.

9. The fermentation process of white vinegar according to claim 1, wherein the concentration of acetic acid bacteria suspension is 10⁷-10⁸g/mL。

10. A white vinegar characterized by being produced by the fermentation process of the white vinegar according to any one of claims 1 to 9.

Background

The vinegar is an essential seasoning in people's life, and the traditional Chinese vinegar brewing process is a solid brewing method, and is mainly characterized by that the raw materials are steamed, gelatinized, liquefied and saccharified to convert starch into sugar, then the sugar is fermented into ethanol by using yeast, then the fillers of bran, rice husk and the like are supplemented to make acetic fermentation, and then the finished product is obtained through ageing, vinegar spraying and disinfection.

In the prior art, the chinese patent application No. CN201710048820.1 discloses an application method of multiple enzyme preparations in the solid-state acetic acid fermentation process of whole grain mature vinegar, which comprises the following steps: (1) crushing the raw materials; (2) slurry mixing and liquefying; (3) saccharifying; (4) alcohol fermentation: cooling to 32 deg.C, adding yeast 62.5 wt% and yeast 0.2 wt% into the saccharified solution with concentration of 15BX, stirring, and continuously cooling to 25-28 deg.C for alcoholic fermentation; open fermentation is carried out 2 days before fermentation, the temperature is controlled to be 30-32 ℃, natural fermentation is carried out in a closed manner 3 days, and closed fermentation is maintained for 15 days; (5) solid-state acetic acid fermentation: adding bran, bran coat and rice hull into the fermented glutinous rice according to 100%, 80% and 40% of the raw materials, respectively, adding acid protease with the proportion of 3% -5% of the fermented grains of vinegar, cellulase with the proportion of 0.4% -0.5% and glucoamylase with the proportion of 0.20% -0.25%, mixing, turning and stirring uniformly, keeping the water content at 65% and the alcoholic strength at more than or equal to 4.5%; putting the fermented grains into a jar for ignition, wherein the inoculation amount is 10% of the fermented grains of the vinegar, covering the peripheral fermented grains after ignition, and stacking the new fermented grains into a convex shape; turning over the fermented grains every day, controlling the temperature to be 38-40 ℃ in the first 3 days, and controlling the temperature to be more than 45 ℃ in the middle period of fermentation; after acetic acid fermentation is carried out for 9-12 days, the temperature is naturally reduced to below 38 ℃, the total acid is 4.5g/100mL, the alcoholic strength is less than 0.2 percent, and the acetic acid fermentation is finished; (6) smoking; (7) pouring vinegar: .

Aiming at the related technologies, the inventor considers that the fermentation period of the existing solid brewing method does not need to turn over the fermented grains of vinegar every day, the fermentation period is different from 21 to 27 days, the fermentation period is longer, the color of the fermented finished product is dark brown or reddish brown, and the shape of western dishes or light dishes is easily influenced.

Disclosure of Invention

In order to remove the complicated steps of the traditional process, shorten the fermentation period, reduce the color depth of the white vinegar and prevent the color depth from influencing the dish shape, the application provides the fermentation process of the white vinegar and the white vinegar.

In a first aspect, the application provides a fermentation process of white vinegar, which adopts the following technical scheme:

a fermentation process of white vinegar comprises the following steps:

s1, alcoholic fermentation: crushing, cooking, liquefying, saccharifying and fermenting the fermentation raw materials to prepare alcohol;

s2, acetic fermentation: adding white vinegar and acetic acid bacteria suspension into alcohol, adjusting the initial fermentation alcoholic strength to 3-5%, total acid to 5-7g/100mL, adding 8-15% of acetic acid bacteria suspension, adding 15-20% of cassava saccharification liquid of the total amount of alcohol and white vinegar, fermenting at 29-33 deg.C, ventilating at 40-60L/h, periodically detecting acetic acid content, stopping fermentation when the acetic acid content is more than 6% and the acidity growth rate is 0-0.29%, and making into semi-finished product;

s3, fixation: filtering, preparing and steaming the fermented semi-finished product to obtain the white vinegar, wherein the steaming temperature is 110-125 ℃, and the steaming time is 4-6 s.

By adopting the technical scheme, fermentation raw materials are subjected to crushing, cooking, liquefaction and saccharification and then are fermented to prepare alcohol, then white vinegar and acetic acid bacteria suspension are used for carrying out acetic acid fermentation, cassava saccharification liquid is added during fermentation to provide glycogen for the acetic acid bacteria suspension, so that the fermentation speed is accelerated, the acetic acid fermentation period is about 7 days, the fermentation time is shortened, complicated steps such as unstrained spirits turning and vinegar pouring are not needed, the operation process is simple, cassava has the effects of resisting bacteria and diminishing inflammation, and the sterilization effect of the white vinegar is enhanced after the white vinegar is prepared by fermentation.

Preferably, the fermentation raw material is rice.

By adopting the technical scheme, the rice is fermented, the nutrient components are converted, the protein is fermented and then decomposed into rich amino acid and short peptide which can be directly absorbed by the human body, and the function of the human body can be recovered in the shortest time, and the rice contains 18 amino acids, and a part of inorganic mineral substances can become healthy organic mineral substances after being fermented, thereby being beneficial to the absorption of the human body.

Preferably, the fermentation raw materials also comprise taro, couchgrass root and water chestnut peel, wherein the addition amount of the taro is 10-20% of the rice dosage, the addition amount of the couchgrass root is 5-15% of the rice dosage, and the addition amount of the water chestnut peel is 15-30% of the rice dosage.

By adopting the technical scheme, along with the gradual aggravation of the pollution problem in China, smoke dust, tail gas, dust and the like in the air are retained in alveolus through the respiration action, one part of the smoke dust, tail gas, dust and the like are deposited in the lung, the other part of the smoke dust, tail gas, dust and the like are slowly absorbed into the body, diseases such as chronic bronchitis and the like are gradually accumulated, the main symptoms of cough and excessive phlegm are cough and excessive phlegm, through using the taro, the couchgrass root and the water chestnut peels as fermentation raw materials, the taro can reduce phlegm and relieve cough, moisten the lung and condition, can dredge blood vessels and promote blood circulation, the couchroot can clear away heat and toxic materials and reduce phlegm and relieve cough, is suitable for lung heat cough, wind heat cough, acute tracheitis, pneumonia and the like, and the couchroot also has the effects of bacteriostasis and phlegm reduction, and the water chestnut peels have the antibacterial effects of clearing away the lung heat and relieving cough, reducing qi and reducing phlegm, and the water chestnut peels have the antibacterial effect on escherichia coli, staphylococcus aureus and the like, so the taro, the water chestnut peels and the rice are used as the fermentation raw materials together, the white vinegar has the effects of moistening lung, relieving cough, eliminating phlegm and regulating lung, and also has the antibacterial and bacteriostatic effects.

Preferably, the step S1 of alcoholic fermentation specifically includes: s11, crushing rice, mixing the crushed rice with water according to the weight ratio of 1:4-6, uniformly stirring, heating to 100-;

cleaning and peeling taro, mixing with cleaned lalang grass rhizome and corm Eleocharitis peel, pulping, performing enzymolysis on the mixed pulp, adjusting pH to 4-4.5, filtering to obtain mixed solution B, mixing the mixed solution A and the mixed solution B to obtain fermentation liquid;

s12, adding a saccharifying agent and active dry yeast into the fermentation liquor, mixing, and fermenting for 5-7 days at 25-30 ℃ to obtain the alcohol, wherein the adding amount of the active dry yeast is 0.05-0.2% and the adding amount of the saccharifying agent is 20-40% based on the weight of the fermentation raw materials.

By adopting the technical scheme, rice is smashed, cooked and liquefied to prepare a mixed solution A, taro, cogongrass rhizome and water chestnut peel are mixed and pulped, and are mixed with the mixed solution A after enzymolysis, saccharifying agent and active dry yeast are added, and saccharification and alcohol fermentation are carried out simultaneously, glucose produced by saccharification is utilized by the yeast through production, product inhibition is removed, activity of the saccharifying agent is kept, and bacteria contamination is prevented, so that a fermentation process is simplified, fermentation time is shortened, taro, cogongrass rhizome, water chestnut peel and rice are used for fermentation to prepare alcohol, and the alcohol is subjected to acetic acid fermentation, so that the prepared white vinegar has the effects of moistening lung to arrest cough, reducing phlegm and regulating lung, and the antibacterial and bacteriostatic effects are improved.

Preferably, in the step S12, a saccharifying enzyme is added to the fermentation broth during fermentation to adjust the glucose concentration in the fermentation broth to 22-25 g/L.

By adopting the technical scheme, the saccharifying enzyme can decompose residual starch, the starch in the couchgrass roots, the taros and the water chestnut peels is converted into glucose, the glucose concentration is the fermentation sugar concentration suitable for the strains, the raw material utilization rate and the yield are improved, the fermentation speed is further accelerated, the fermentation time is shortened, and if the adding amount of the saccharifying enzyme is high, the activity of the saccharifying enzyme is reduced rapidly due to the inhibition of the saccharified glucose on the saccharifying enzyme, the post-saccharification effect is weak, and the fermentation time is prolonged.

Preferably, the enzymolysis method of the mixed slurry in step S11 is as follows: adding cellulase and pectase into the mixed pulp, and performing enzymolysis at 35-45 deg.C for 60-90min, wherein the cellulase is 0.07-0.1% of the mixed pulp, and the pectase is 0.1-0.15% of the mixed pulp.

By adopting the technical scheme, the cellulase is helpful for hydrolyzing cellulose on one hand, converts the cellulose into sugar which can be used by active yeast, participates in fermentation, improves the utilization rate of raw materials, and helps for dissolving out other substances, including substances such as starch, protein and the like, and the substances such as pectin, mucin and the like existing in couchgrass root, taro and water chestnut peel can be removed by the synergistic enzymolysis of the cellulase and the pectinase, so that the influence of the cellulase on the hydrolysis effect of the enzyme on the starch is prevented, the cellulose and pectin substances are catalytically hydrolyzed, and the viscosity of the mixed pulp is reduced.

Preferably, the saccharifying agent is vinegar residue saccharifying yeast and is prepared by the following method: mixing bran with water, steaming and boiling for 30-50min under normal pressure, cooling, mixing with vinegar residue, adding sweet potato Aspergillus AS3.324 accounting for 3-5% of the mass of the bran and Aspergillus niger accounting for 3-5% of the mass of the bran, mixing uniformly, culturing at constant temperature of 30-35 ℃ for 27-32h, and drying to obtain the vinegar residue saccharified yeast, wherein the mass ratio of the bran to the vinegar residue is 1: 1.25-2.5.

By adopting the technical scheme, the vinegar residue is vinegar residue which is a byproduct of vinegar brewing, the vinegar residue and the bran are used AS raw materials, the sweet potato aspergillus AS3.324 and the aspergillus niger are added, the culture is carried out in a microbial fermentation mode, waste is turned into wealth, the nutritive value of the vinegar residue is improved, the fermented vinegar residue saccharified yeast contains a large amount of beneficial live bacteria, a plurality of vitamins, a plurality of biological enzymes, amino acids, short peptides, high-quality proteins and the like, the nutritional ingredients are metabolites in the microbial growth process, the vinegar residue saccharified yeast is green, environment-friendly and purely natural, in addition, the aspergillus niger and the sweet potato aspergillus are good carbon sources for fermenting glucose, the saccharifying force is high, and the fermentation period of white vinegar can be shortened.

Preferably, the cassava saccharification liquid is prepared by crushing cassava, adding water, uniformly mixing, heating to 85-90 ℃, maintaining the temperature for 10-20mi, cooling, adding a saccharifying enzyme accounting for 0.01-0.05% of the weight of the cassava, and saccharifying at 60-65 ℃ for 30-40 min.

By adopting the technical scheme, the cassava is crushed, so that the raw material particles are reduced, the cell tissue is partially destroyed, the starch particles are partially leaked, the specific surface area of the raw material is increased, the water absorption speed of the raw material is accelerated, the full contact between the saccharifying enzyme and the starch is facilitated, the complete hydrolysis of the starch is promoted, the saccharifying enzyme is utilized to decompose the starch into fermentable sugar, and the white vinegar is formed by fermentation under the fermentation of acetic acid bacteria suspension.

Preferably, the concentration of the acetic acid bacteria suspension is 10⁷-10⁸g/mL。

By adopting the technical scheme, the acetic acid bacteria suspension at the concentration can fully use alcohol as a carbon source and an energy source.

In a second aspect, the present application provides a white vinegar, which adopts the following technical scheme:

a white vinegar is prepared by fermenting white vinegar.

By adopting the technical scheme, the prepared white vinegar is light yellow in color, the dish shape is prevented from being influenced, and the antibacterial effect is good.

In summary, the present application has the following beneficial effects:

1. the method is characterized in that the white vinegar is prepared by adopting a deep liquid fermentation mode, fermentation raw materials are subjected to crushing, cooking, liquefaction, saccharification and alcohol fermentation to prepare alcohol, then the alcohol is mixed with the white vinegar and an acetic acid bacteria suspension to adjust the fermentation acidity and the alcoholic strength, and then cassava saccharification liquid is used for providing energy and glycogen for the acetic acid bacteria, so that the fermentation speed of the acetic acid bacteria is accelerated, the fermentation period is shortened, and the color of the white vinegar is lightened after enzyme deactivation, so that when the white vinegar is used for a light-colored vegetable system, the color and the shape of the vegetable system cannot be influenced.

2. Preferentially adopt taro, couchgrass root and water chestnut peel and rice as fermentation raw materials in this application, because taro, couchgrass root and water chestnut peel have the effect of clearing away heat and toxic material, eliminating phlegm and relieving a cough, and couchgrass root and water chestnut peel have antibiotic effect to escherichia coli etc. for white vinegar has the effect of clearing away heat and regulating the lung, relieving a cough and reducing phlegm, and antibacterial effect promotes.

3. In the application, preferably, in the alcohol fermentation, saccharifying enzyme is supplemented to the fermentation liquor, so that the glucose concentration is the concentration of the fermentation sugar suitable for the strains, thereby improving the utilization rate of raw materials and the yield, further accelerating the fermentation speed of alcohol and shortening the whole fermentation period.

4. In the application, the vinegar residue saccharified yeast prepared from vinegar residue, bran, sweet potato aspergillus AS3.324 and aspergillus niger is preferably used AS a saccharifying agent, so that the vinegar residue is changed into valuable, the nutritive value of the vinegar residue is improved, the fermented vinegar residue saccharified yeast contains a large amount of beneficial live bacteria, multiple vitamins and the like, the vinegar residue saccharified yeast is natural and environment-friendly, and in addition, the aspergillus niger and the sweet potato aspergillus are good carbon sources, the saccharifying force is high, and the fermentation period can be further shortened.

Detailed Description

Preparation examples 1 to 5 of Vinegar residue saccharifying koji

Preparation examples 1-5 the sweet potato Aspergillus AS3.324 was selected from North Nami organism under accession number BNCC 176431; aspergillus niger is selected from Shanghai Jiachu bioengineering GmbH, numbered as SHBCCD19010, and vinegar residue is selected from Beijing Lai Chen food GmbH.

Preparation example 1: mixing bran and water, wherein the adding amount of the water is 50% of that of the bran, steaming and boiling the bran and the water for 30min under normal pressure, cooling, mixing with vinegar residues, adding sweet potato aspergillus AS3.324 accounting for 3% of the mass of the bran and aspergillus niger accounting for 3%, uniformly mixing, culturing at a constant temperature of 30 ℃ for 32h, performing heat sealing drying at 50 ℃ by using 0.8m/s of gourmet powder, and drying until the water content of the vinegar residue saccharified yeast is 16% to obtain the vinegar residue saccharified yeast, wherein the mass ratio of the bran to the vinegar residue is 1: 1.25.

Preparation example 2: mixing bran and water, wherein the adding amount of the water is 55% of the bran, steaming and boiling the bran and the water for 40min under normal pressure, cooling, mixing with vinegar residues, adding sweet potato aspergillus AS3.324 accounting for 4% of the mass of the bran and aspergillus niger accounting for 4% of the mass of the bran, uniformly mixing, culturing at constant temperature of 35 ℃ for 27h, performing heat sealing drying at 50 ℃ by using 0.6m/s of gourmet powder, and drying until the water content of the vinegar residue saccharified yeast is 16% to prepare the vinegar residue saccharified yeast, wherein the mass ratio of the bran to the vinegar residue is 1:2.

Preparation example 3: mixing bran and water, wherein the adding amount of the water is 60% of that of the bran, steaming and boiling the bran and the water for 50min under normal pressure, cooling, mixing with vinegar residues, adding sweet potato aspergillus AS3.324 accounting for 5% of the mass of the bran and aspergillus niger accounting for 5%, uniformly mixing, culturing at constant temperature of 35 ℃ for 32h, performing heat sealing drying at 50 ℃ by using 1.0m/s of gourmet powder, and drying until the water content of the vinegar residue saccharified yeast is 16% to obtain the vinegar residue saccharified yeast, wherein the mass ratio of the bran to the vinegar residue is 1: 2.5.

Preparation example 4: the difference from preparation example 1 was that Aspergillus sojae AS3.324 was not added.

Preparation example 5: the difference from preparation example 1 is that Aspergillus niger was not added.

Examples

In various embodiments, the alpha-amylase is selected from the group consisting of Qingdao Hevesen Biotech, Inc., cat # 6139; saccharifying enzyme is selected from Jiangsu Fushend bioengineering limited company, the product number is 102, active dry yeast is selected from Hebei Rui-win biotechnology limited company, the product number is 075, acetic acid bacteria is selected from Jinan Yuyuan biotechnology limited company, the product number is NY-300, cellulase is selected from Qingdao Hevesen biotechnology limited company, and the product number is 1011; the pectinase is selected from Huizhou Yuanle Biotech, Inc., Cat 250.

Example 1: a fermentation process of white vinegar comprises the following steps:

s1, alcoholic fermentation:

s11, crushing rice, mixing the crushed rice with water according to the weight ratio of 1:4, stirring uniformly, heating to 100 ℃, cooking, cooling to room temperature, adding 8U/g alpha-amylase, mixing uniformly, adjusting the pH value to 6.5, controlling the pH value to 85 ℃, adding water to enable the mass percentage of soluble solids to be 16%, cooling to 20 ℃, and preparing a mixed solution A;

s12, adding a saccharifying agent and active dry yeast into the mixed liquor A, uniformly mixing, and fermenting at 25 ℃ for 6 days to obtain alcohol, wherein the adding amount of the active dry yeast is 0.05 percent, the adding amount of the saccharifying agent is 20 percent and the saccharifying agent is saccharifying enzyme based on the weight of the rice;

s2, acetic fermentation: adding white vinegar and acetic acid bacteria suspension into alcohol, adjusting initial fermentation alcoholic strength to 3%, total acid to 5g/100mL, adding acetic acid bacteria suspension 8% of white vinegar and alcohol, and acetic acid bacteria suspension concentration to 10⁷g/mL, adding a cassava saccharification liquid accounting for 15% of the total amount of the alcohol and the white vinegar, controlling the fermentation temperature to be 29-33 ℃, controlling the ventilation volume to be 40L/h, fermenting for 7 days, periodically detecting the content of acetic acid, and stopping fermentation when the content of the acetic acid is more than 6% and the acidity increase rate is 0.15%, thus obtaining a semi-finished product;

the cassava saccharification liquid is prepared by crushing cassava, adding water accounting for 60% of the cassava, uniformly mixing, heating to 85 ℃, maintaining the temperature for 20mi, cooling, adding saccharifying enzyme accounting for 0.01% of the cassava, and saccharifying at 60 ℃ for 40 min;

s3, fixation: and (3) filtering, preparing and performing steam enzyme deactivation on the fermented semi-finished product to obtain the white vinegar, wherein the enzyme deactivation temperature is 110 ℃, and the enzyme deactivation time is 6 s.

Example 2: a fermentation process of white vinegar comprises the following steps:

s1, alcoholic fermentation:

s11, crushing rice, mixing the crushed rice with water according to the weight ratio of 1:5, stirring uniformly, heating to 105 ℃, cooking, cooling to room temperature, adding 20U/g alpha-amylase, mixing uniformly, adjusting the pH value to 6, controlling the temperature to 90 ℃, adding water to enable the mass percentage of soluble solids to be 17%, cooling to 25 ℃, and preparing a mixed solution A;

s12, adding a saccharifying agent and active dry yeast into the mixed liquor A, uniformly mixing, and fermenting at 27 ℃ for 6 days to obtain alcohol, wherein the adding amount of the active dry yeast is 0.1 percent, the adding amount of the saccharifying agent is 30 percent and the saccharifying agent is saccharifying enzyme based on the weight of the rice;

s2, acetic fermentation: adding white vinegar and acetic acid bacteria suspension into alcohol, adjusting initial fermentation alcoholic strength to 4%, total acid to 6g/100mL, adding acetic acid bacteria suspension 11% of white vinegar and alcohol, and acetic acid bacteria suspension concentration to 10⁸g/mL, adding cassava saccharification liquid accounting for 18% of the total amount of the alcohol and the white vinegar, controlling the fermentation temperature to be 29-33 ℃, controlling the ventilation volume to be 50L/h, fermenting for 7 days, periodically detecting the content of acetic acid, and stopping fermentation when the content of the acetic acid is more than 6% and the acidity increase rate is 0 to obtain a semi-finished product;

the cassava saccharification liquid is prepared by crushing cassava, adding 55% of water for uniformly mixing, heating to 90 ℃, maintaining for 10mi, cooling, adding 0.05% of saccharifying enzyme for saccharifying at 65 ℃ for 30 min;

s3, fixation: and (3) filtering, preparing and performing steam enzyme deactivation on the fermented semi-finished product to obtain the white vinegar, wherein the enzyme deactivation temperature is 120 ℃, and the enzyme deactivation time is 5 s.

Example 3: a fermentation process of white vinegar comprises the following steps:

s1, alcoholic fermentation:

s11, crushing rice, mixing the crushed rice with water according to the weight ratio of 1:6, stirring uniformly, heating to 110 ℃, cooking, cooling to room temperature, adding 30U/g alpha-amylase, mixing uniformly, adjusting the pH value to 6.3, controlling the temperature to be 90 ℃, adding water to enable the mass percentage of soluble solids to be 18%, cooling to 25 ℃, and preparing a mixed solution A;

s12, adding a saccharifying agent and active dry yeast into the mixed liquor A, uniformly mixing, and fermenting at 30 ℃ for 7 days to obtain alcohol, wherein the adding amount of the active dry yeast is 0.2 percent, the adding amount of the saccharifying agent is 40 percent, and the saccharifying agent is saccharifying enzyme;

s2, acetic fermentation: adding white vinegar and acetic acid bacteria suspension into alcohol, adjusting initial fermentation alcoholic strength to 5%, total acid to 7g/100mL, adding acetic acid bacteria suspension 15% of white vinegar and alcohol, and acetic acid bacteria suspension concentration to 10⁷g/mL, adding cassava saccharification liquid accounting for 20% of the total amount of the alcohol and the white vinegar, controlling the fermentation temperature to be 29-33 ℃, controlling the ventilation volume to be 60L/h, fermenting for 7 days, periodically detecting the content of acetic acid, and stopping fermentation when the content of the acetic acid is more than 6% and the acidity increase rate is 0.29%, thus obtaining a semi-finished product;

the cassava saccharification liquid is prepared by crushing cassava, adding water accounting for 50% of the cassava, uniformly mixing, heating to 85 ℃, maintaining for 15mi, cooling, adding saccharifying enzyme accounting for 0.03% of the cassava, and saccharifying at 65 ℃ for 35 min;

s3, fixation: filtering, preparing and steaming the fermented semi-finished product to obtain the white vinegar, wherein the steaming temperature is 125 ℃, and the steaming time is 4 s.

Example 4: a fermentation process of white vinegar is different from that of embodiment 1 in that in step S11, taro is cleaned and peeled, the taro is mixed with cleaned couchgrass roots and water chestnut peels and pulped, cellulase and pectinase are added into the mixed liquid, enzymolysis is carried out for 90min at 35 ℃, the pH value is adjusted to 4, filtration is carried out, mixed liquid B is prepared, the mixed liquid A and the mixed liquid B are mixed to prepare fermentation liquid, the addition amount of the taro is 10% of the amount of rice, the amount of the couchgrass roots is 5% of the amount of the rice, the amount of the water chestnut peels is 15% of the amount of the rice, the addition amount of the cellulase is 0.07% of the total weight of the mixed pulp, and the addition amount of the pectinase is 0.1% of the total weight of the mixed pulp.

Example 5: a fermentation process of white vinegar is different from that of embodiment 1 in that in step S11, taro is cleaned and peeled, the taro is mixed with cleaned couchgrass roots and water chestnut peels and pulped, cellulase and pectinase are added into the mixed liquid, enzymolysis is carried out for 70min at 40 ℃, the pH value is adjusted to 4.3, filtration is carried out to obtain mixed liquid B, the mixed liquid A and the mixed liquid B are mixed to prepare fermentation liquid, the addition amount of the taro is 15% of the amount of rice, the amount of the couchgrass roots is 10% of the amount of rice, the amount of the water chestnut peels is 20% of the amount of rice, the addition amount of the cellulase is 0.09% of the total weight of the mixed pulp, and the addition amount of the pectinase is 0.13% of the total weight of the mixed pulp.

Example 6: a fermentation process of white vinegar is different from that of embodiment 1 in that in step S11, taro is cleaned and peeled, the taro is mixed with cleaned couchgrass roots and water chestnut peels and pulped, cellulase and pectinase are added into the mixed liquid, enzymolysis is carried out for 60min at 45 ℃, the pH value is adjusted to 4.5, filtration is carried out to obtain mixed liquid B, the mixed liquid A and the mixed liquid B are mixed to prepare fermentation liquid, the addition amount of the taro is 20% of the amount of rice, the amount of the couchgrass roots is 15% of the amount of rice, the amount of the water chestnut peels is 30% of the amount of rice, the addition amount of the cellulase is 0.1% of the total weight of the mixed pulp, and the addition amount of the pectinase is 0.15% of the total weight of the.

Example 7: a fermentation process of white vinegar, which is different from that of example 4 in that taro is not added in step S11.

Example 8: a fermentation process of white vinegar, which is different from the embodiment 4 in that couchgrass root is not added in the step S11.

Example 9: a fermentation process of white vinegar, which is different from the embodiment 4 in that water chestnut peels are not added in the step S11.

Example 10: a process for fermenting white vinegar, which is different from that of example 4, is characterized in that a saccharifying agent is an acetic acid residue saccharifying yeast prepared in preparation example 1 of acetic acid residue saccharifying yeast.

Example 11: a fermentation process of white vinegar is different from that of example 4 in that a saccharifying agent is an acetic acid residue saccharifying yeast prepared in preparation example 2 of the acetic acid residue saccharifying yeast.

Example 12: a fermentation process of white vinegar is different from that of example 4 in that a saccharifying agent is an acetic acid residue saccharifying yeast prepared in preparation example 3 of the acetic acid residue saccharifying yeast.

Example 13: a fermentation process of white vinegar is different from that of example 4 in that a saccharifying agent is an acetic acid residue saccharifying yeast prepared in preparation example 4 of the acetic acid residue saccharifying yeast.

Example 14: a fermentation process of white vinegar is different from that of example 4 in that a saccharifying agent is an acetic acid residue saccharifying yeast prepared in preparation example 5 of acetic acid residue saccharifying yeast.

Example 15: a difference from example 4 is that, in step S12, saccharifying enzyme is added to the fermentation broth so that the concentration of glucose in the fermentation broth is 22 g/L.

Example 16: a difference from example 4 is that, in step S12, saccharifying enzyme is added to the fermentation broth so that the concentration of glucose in the fermentation broth is 25 g/L.

Example 17: a difference from example 4 is that, in step S12, saccharifying enzyme is added to the fermentation broth during fermentation to make the glucose concentration in the fermentation broth 35 g/L.

Example 18: a process for fermenting white vinegar, which is different from that of example 4 in that a saccharifying agent is an acetic acid residue saccharifying yeast prepared in preparation example 1 of acetic acid residue saccharifying yeast, and that saccharifying enzyme is supplemented to a fermentation liquid during fermentation to make the concentration of glucose in the fermentation liquid 25 g/L.

Comparative example

Comparative example 1: a fermentation process of white vinegar is different from that of example 1 in that the step S3 of deactivating enzymes is not performed.

Comparative example 2: a fermentation process of white vinegar is different from the fermentation process of the embodiment 1 in that no cassava saccharification liquid is added in the step S2 and the acetic acid fermentation.

Comparative example 3: a fermentation process of white vinegar is different from the fermentation process of the embodiment 1 in that in the step S2 and the acetic acid fermentation, the dosage of cassava saccharification liquid is 10 percent.

Comparative example 4: a fermentation process of white vinegar is different from the fermentation process of the embodiment 1 in that in the step S2 and the acetic acid fermentation, the dosage of cassava saccharification liquid is 25 percent.

Comparative example 5: a process for self-making white vinegar comprises the following steps: (1) preparing the following components in parts by mass: 50 parts of barley, 10 parts of rice and 0.2 part of buckwheat; (2) soaking the above materials respectively, decocting, mixing, adding distiller's yeast, fermenting at room temperature for 25 days while stirring once a day, adding purified water after fermentation, filtering, and collecting filtrate.

Performance test

Firstly, sensory evaluation: white vinegar was prepared according to the methods of the examples and comparative examples, 10 volunteers were randomly selected, the white vinegar prepared according to the examples and comparative examples was subjected to sensory evaluation according to the criteria of table 1, the sensory evaluation results of the 10 volunteers for the white vinegar were recorded in table 2, and the score of each result was averaged over 10 volunteers.

Secondly, detecting the acidity value: the content of total acids and soluble salt-free solids in the white vinegar was measured according to the standard of GB/T18187-2000 brewed Vinegar, and the measurement results are reported in Table 2.

Thirdly, bacteriostatic activity detection: the pathogenic bacteria are activated to two generations for standby: LB culture medium, inoculum size of 1%, shake culture at 37 ℃ for 12h, pouring the sterilized LB culture medium to a flat plate under aseptic operation, cooling to the culture medium to be completely solidified, diluting the activated second-generation pathogenic bacteria to 10-2CFU/mL, respectively removing 100 mu L of diluted staphylococcus aureus and escherichia coli, injecting the staphylococcus aureus and escherichia coli to the completely solidified flat plate, uniformly coating an ingoing coating rod, placing for about 30min, uniformly punching holes on each flat plate by using a puncher, then adding 100 mu L of white vinegar into the small holes, paralleling each sample, placing the sample-adding flat plate in an incubator at 20 ℃ for diffusion for about 12h, transferring the diffused flat plate to an incubator at 37 ℃ for 24h, measuring the diameter of a bacteriostatic ring, observing the bacteriostatic effect, and recording the detection result in Table 2.

TABLE 1 sensory evaluation criteria

TABLE 2 sensory evaluation, acidity and bacteriostatic effect test of each example and comparative example

In the examples 1-3, rice is adopted as a fermentation raw material, after the rice is fermented into alcohol, the alcohol is mixed with white vinegar, acetic acid bacteria and cassava saccharification liquid and fermented into a semi-finished product, and after the filtration, the preparation and the fixation, the prepared white vinegar is obtained, and the sensory evaluation results of the fragrance, the taste and the color of the white vinegar are carried out by 10 volunteers, so that the white vinegar prepared in the examples 1-3 has good sour and sweet taste, has certain faint scent, pure smell and no peculiar smell, is light yellow, clear and transparent, prevents the influence on the shapes of western dishes or light-colored dishes or soup, and has better antibacterial effect on staphylococcus aureus and escherichia coli.

Compared with the embodiment 1, the white vinegar prepared by adding the taro, the couchgrass root and the water chestnut peel and fermenting in the embodiments 4-6 has the advantages of improved fragrance evaluation score, lasting mouthfeel, improved taste sensory score, increased diameter of a bacteriostatic circle for staphylococcus aureus and escherichia coli and improved bacteriostatic effect.

Compared with the example 4, the white vinegar prepared by the examples 7 to 9 has reduced fragrance and taste score and reduced content of soluble salt-free solid compared with the example 4, and the white vinegar prepared by the example 8 without the couchgrass root and the example 9 without the water chestnut peel has reduced diameter of the inhibition zone for escherichia coli and staphylococcus aureus compared with the example 4, which shows that the couchgrass root and the water chestnut peel have antibacterial effect after fermentation and can improve the antibacterial effect of the white vinegar.

Examples 10 to 12 compared with example 4, the white vinegar produced in examples 10 to 12, which used a koji from vinegar residue saccharification as a saccharifying agent, had a fragrance, color and taste comparable to example 4, and still had a good fragrance, flavor and color, and a content of soluble salt-free solids comparable to example 4.

Example 13 compared with example 4, the koji for vinegar residue saccharification prepared in preparation example 4, in which aspergillus batatas AS3.324 was not added, was used, and example 14 compared with example 4, in which aspergillus niger was not added, the white vinegar prepared in examples 13 to 14 had little change in taste, color and aroma compared with examples 4 and 10, but the content of soluble salt-free solids of the white vinegar prepared in examples 13 and 14 was decreased.

In examples 15 to 17, in comparison with example 4, in acetic acid fermentation, saccharifying enzyme was supplemented, and in example 18, in comparison with example 1, not only saccharifying enzyme but also vinegar residue saccharifying yeast was used as a saccharifying agent, and the white vinegar prepared in examples 15 to 18 had high sensory evaluation scores for flavor, taste and color and had a good bacteriostatic effect.

Compared with the example 1, the white vinegar has the advantages that the color and luster of the white vinegar are too dark and the fragrance is insufficient without the enzyme deactivating treatment, but the bacteriostatic effect and the acidity of the white vinegar are not influenced.

Comparative example 2 compared with example 1, the white vinegar prepared in comparative example 2 had reduced aroma and deteriorated taste without addition of the tapioca saccharification liquid, and had reduced bacteriostatic activity against staphylococcus aureus and escherichia coli.

In comparative example 3, compared with example 1, the addition amount of the cassava saccharification liquid is reduced, the scores such as the taste of the white vinegar are increased, and the inhibition zone diameters of the cassava saccharification liquid and the white vinegar on staphylococcus aureus and escherichia coli are increased in comparative example 3, but compared with example 1, the sensory evaluation score and the inhibition effect are poor, and the fact that the addition amount of the cassava saccharification liquid can improve the taste and the inhibition effect of the white vinegar is shown.

In comparative example 4, the addition amount of the cassava saccharification liquid is increased compared with example 1, and compared with example 1, the sensory evaluation changes such as the taste, the color and the like of the white vinegar are not large, and the change of the diameter of the inhibition zone is not obvious.

Comparative example 5 is white vinegar prepared by the prior art, which has small color, taste and aroma scores, and has small diameter of inhibition zone for staphylococcus aureus and escherichia coli.

Fourthly, detecting the acetic fermentation time and the alcohol fermentation time: (1) acetic acid fermentation time: semi-finished products are prepared by fermenting according to the methods in examples 1-3 and comparative examples 2-4, the change trend of acidity along with time is detected, the days when the acidity is more than 6 percent is determined as fermentation time, and the detection result is shown in Table 3; (2) alcohol fermentation time: alcohol was produced according to the methods of examples 1 to 4 and examples 10 to 17, and the amount of decrease in the mass of the fermentation liquid was measured at different fermentation time points, and the fermentation rate was evaluated by taking the time when the amount of decrease in the mass of the fermentation liquid increased slowly as the alcohol fermentation time, and the results of the measurements are shown in Table 4.

TABLE 3 acetic acid fermentation time in examples 1-3 and comparative examples 2-4

As is clear from the data in Table 3, in examples 1 to 3, rice was used as a fermentation material, and after alcohol was produced by liquefaction and saccharification fermentation, the rice was mixed with a tapioca saccharification liquid and fermented to produce white vinegar, and the acidity of the white vinegar was already over 6% at 7 days, and the increase rate of the acidity was 0 to 0.29% at the time of fermentation, so that the fermentation time was 7 days.

In comparative example 2, no cassava saccharification liquid is added, the acidity of the fermentation liquid is still 5.52% on the 8 th day of fermentation, the acidity is still not more than 6%, the acidity is more than 6% on the 9 th day, and the fermentation period is longer.

Comparative example 3 compared with example 1, the amount of the cassava saccharification liquid is reduced, the acidity of the fermentation liquid is 5.22% at the 7 th day of fermentation, and reaches 6.13% at the 8 th day, so that the requirement that the acidity is more than 6% is met, the fermentation period is prolonged, and the fermentation speed is reduced compared with examples 1-3.

In comparative example 4, compared with example 1, the dosage of the cassava saccharification liquid is increased, and the acidity of the fermentation liquid is more than 6% at the 7 th day of fermentation, which is not much different from examples 1-3, and shows that the addition of the dosage of the cassava saccharification liquid has little influence on the fermentation speed.

TABLE 4 alcohol fermentation time in each example

As can be seen from the data in table 4, the alcohol prepared by fermenting rice in example 1 tends to have a stable decrease in the fermentation liquid quality at day 5, and the fermentation is slow, while the fermentation time in examples 2 to 3 is 6 days and 7 days, respectively, and the acetic acid fermentation time in examples 1 to 3 is about 7 days, in combination with the data in table 3, so that the fermentation period of the white vinegar in examples 1 to 3 of the present application is about 14 days, and in example 4, compared with example 1, taro, couchgrass root and chufa pericarp are added, and after the fermentation, the decrease in the fermentation liquid quality at day 7 does not change significantly, and the fermentation speed is not significantly different from that in example 1.

Examples 10 to 12 compared with example 4, the amount of decrease in the fermentation broth quality at the 4 th day after fermentation was stabilized and the fermentation time was shortened compared with example 4 by using the koji for vinegar residue saccharification prepared in the present application as a saccharifying agent.

In example 13, the fermentation rate was decreased AS compared with example 10 on day 4, and in example 14, the amount of decrease in the mass of the alcoholic fermentation liquor was decreased AS compared with example 10 on day 4, while the orientation was stabilized on day five, indicating that the fermentation was gradually stopped on day 4 to day 5, indicating that the fermentation was not completed on day 4 in examples 13 to 14, and that the fermentation rate was decreased AS compared with example 10 to 12.

In examples 15 to 16, compared with example 4, in the alcoholic fermentation period, saccharifying enzyme was added to the fermentation broth to control the concentration of glucose in the fermentation broth, and in examples 15 to 16, the mass reduction of the fermentation broth tended to be stable on day 4, and the mass reduction of the fermentation broth did not change significantly with time, and the fermentation was gradually stopped for 4 days.

Example 17 compared with example 4, the amount of supplemental saccharifying enzyme was larger, resulting in excessively high glucose concentration and stable orientation of fermentation broth at 4-5 days, and the fermentation rate was slower than examples 15-16, indicating that the saccharifying effect was decreased and the fermentation time was prolonged due to the larger amount of saccharifying enzyme.

In example 18, in comparison with example 4, the fermentation rate was higher than in examples 4, 10 and 15 because the saccharifying enzyme was added during the fermentation in addition to the use of the koji as the saccharifying agent, and the mass reduction of the fermentation liquid reached 25.7g on day 3, the fermentation was completed on days 3 to 4.

Fifthly, auxiliary cough relieving and phlegm reducing effects detection: selecting the population with cough and profuse sputum, randomly dividing the population into 14 groups, wherein each group comprises 20 persons, each person does not take cough-relieving and phlegm-reducing medicines during the test period, correspondingly eating 20 ml of the white vinegar prepared in examples 1-9 and comparative examples 1-5 every day, the test time is 20 days, and the curative effect judgment standard is as follows: and (3) curing: the discomfort symptom disappears, and the cough can not be seen within 2 hours; the method has the following advantages: the discomfort symptom is obviously improved; and (4) invalidation: the discomfort symptoms are not obviously improved, and after the patient continuously eats the medicine for 20 days, the cure rate (%) is recorded, wherein the cure rate is (effective number of people + effective number of people)/total number of people tested multiplied by 100%, and the detection results are recorded in table 5.

TABLE 5 white vinegar prepared in examples 1 to 9 and comparative examples 1 to 5 has auxiliary antitussive and expectorant effects

Item	Show effect	Is effective	Invalidation	Percent cure rate/%)
					Example 1	1	2	17	15
Example 2	0	2	18	11
					Example 3	1	1	18	11
Example 4	8	7	5	75
					Example 5	8	8	4	80
Example 6	7	8	5	75
					Example 7	5	6	9	50
Example 8	5	5	10	55
					Example 9	4	5	11	45
Comparative example 1	0	2	18	11
					Comparative example 2	1	2	17	15
Comparative example 3	1	1	18	11
					Comparative example 4	1	3	16	20
Comparative example 5	1	2	17	15

The white vinegar prepared in the examples 1 to 3 has a remarkable effect of improving symptoms of cough and excessive phlegm after being eaten by a test crowd for 20 days, the cure rate is only 11 to 15 percent, while the white vinegar prepared in the examples 4 to 6 and added with the taro, the couchgrass root and the water chestnut peels has a remarkable effect of improving symptoms of cough and excessive phlegm after being used by the test crowd for 20 days, the cure rate is 75 to 80 percent, and compared with the example 4, the white vinegar prepared in the examples 7 to 9 has no taro added in the example 7, no couchgrass root added in the example 8, no water chestnut peels added in the example 9 and the white vinegar prepared in the examples 7 to 9 have a reduced effect of improving symptoms of cough and excessive phlegm compared with the example 4, which shows that the taro, the couchgrass root and the water chestnut peels have the effect of assisting in relieving cough and reducing phlegm.

As shown by the data in Table 5, the white vinegar prepared in the comparative examples 1 to 5 has no significant effect on the adjuvant therapy effect on cough and phlegm reduction, thereby indicating that the water-removing is not carried out in the comparative example 1, and the cassava saccharification liquid added in the comparative examples 2 to 4 has no great influence on the cough and phlegm reduction effect of the white vinegar.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.