1. A stable isotope amino compound labeling reagent has a chemical structural formula as shown in formula 1:

wherein: and X is D, and R is any one of F, Cl, Br and I.

2. The stable isotope amino compound labeling reagent of claim 1, wherein R is Cl.

3. The stable isotope amino compound labeling reagent in accordance with claim 1, wherein n is 2 or 3.

4. A method for synthesizing a stable isotope amino compound labeling reagent, comprising the steps of:

(1) providing an intermediate I: [ d₅]-N-phenyl anthranilic acid;

(2) synthesis of intermediate II: dissolving the intermediate I in concentrated sulfuric acid, heating for reaction, cooling, pouring cooling liquid obtained by cooling into boiling water, separating out a separated solid product, washing the solid product, and drying to obtain an intermediate II;

(3) synthesis of intermediate III: dissolving the intermediate II and ethylene carbonate into dimethyl sulfoxide, adding trace potassium hydroxide, heating for reaction, cooling, pouring the obtained cooling liquid into a salt water solution, separating out a precipitated solid product, washing the solid product, drying, and recrystallizing to obtain an intermediate III;

(4) under the cooling condition, triethylamine is dripped into the solution dissolved with the solid phosgene; and then adding a solution in which the intermediate III is dissolved, and separating a solid product after the reaction is finished to obtain the stable isotope amino compound labeling reagent.

5. The method of synthesizing a stable isotope amino compound labeling reagent of claim 4, wherein in step (1), the synthesis of intermediate I comprises the steps of:

(i) dissolving o-aminobenzoic acid, copper powder and potassium carbonate into dimethyl sulfoxide, uniformly mixing, and adding deuterated bromobenzene-d₅Then heating for reaction, filtering reaction liquid after the reaction is finished, and collecting filtrate;

(ii) and pouring the filtrate into water, adjusting the pH value to 5-6 by using concentrated hydrochloric acid, and filtering and drying the precipitated solid to obtain an intermediate I.

6. The method of claim 5, wherein in step (i), the anthranilic acid is reacted with deuterated bromobenzene-d₅The molar ratio of (A) to (B) is 1-1.5: 1;

or the addition amount of the copper powder is anthranilic acid and deuterated bromobenzene-d₅0.05 to 0.1 times of the total molar amount;

or the potassium carbonate is added in the amount of anthranilic acid and deuterated bromobenzene-d₅1.1 to 1.5 times of the total molar amount;

preferably, in the step (i), the heating reaction is carried out by adopting oil bath heating, and the heating temperature is 145-150 ℃;

or in the step (2), the heating reaction temperature is 95-100 ℃, and the reaction time is 1.5-2.5 h.

7. The method for synthesizing a stable isotope amino compound labeling reagent in accordance with claim 4, wherein in step (3), the molar ratio of the intermediate II to ethylene carbonate is 1:1.2 to 1.5;

or, in the step (3), the heating reaction is carried out by adopting oil bath heating, the heating temperature is 140-150 ℃, and the reaction time is 5-6.5 h;

or, in the step (3), recrystallizing with acetonitrile to obtain a light yellow crystal, namely the intermediate III.

8. The method for synthesizing a stable isotope amino compound labeling reagent in accordance with claim 4, wherein in the step (4), the phosgene solution is prepared by dissolving phosgene in methylene chloride;

or in the step (4), the addition amount of the triethylamine is 2.7-3.5% of the mass of the solid phosgene;

or in the step (4), the molar ratio of the intermediate III to the solid phosgene is 1: 1.8-2.3;

or, in the step (4), the reaction is firstly carried out in an ice bath for 4 hours, then the temperature is raised to the room temperature, the reaction is continuously carried out for 5 hours, after the reaction is finished, the reaction solution is filtered, the filtrate is decompressed and evaporated to dryness by using a rotary evaporator, and is recrystallized by using acetonitrile, so that the labeled reagent is obtained.

9. Use of the stable isotope amino compound labeling reagent of any one of claims 1 to 3 and/or the stable isotope amino compound labeling reagent obtained by the synthesis method of any one of claims 4 to 8 in the fields of life analysis, environmental analysis, and food analysis, preferably for detecting the concentration of biogenic amines in an analyte.

10. The use of claim 9, wherein the method for detecting the concentration of biogenic amine in the test substance comprises the steps of:

s1: preparing borax/boric acid buffer solution (preferably pH 9.5), and preparing [ d [ ]₀]Acetonitrile solution of (E) -2- (9-acridone) ethyl chloroformate as light marking reagent solution to prepare (d)₄]-a solution of 2- (9-acridone) ethylchloroformate in acetonitrile as a solution of a heavy-duty labeling reagent;

s2: mixing the borax/boric acid buffer solution, a sample to be tested containing biogenic amine and a light marking reagent solution in sequence and then reacting to obtain a reaction solution a;

s3: mixing the borax/boric acid buffer solution, a sample to be tested containing biogenic amine and a heavy marking reagent solution in sequence and then reacting to obtain a reaction solution b;

s4: and mixing the reaction solution a and the reaction solution b in equal volume, and then analyzing by adopting HPLC-MS/MS: the peak area of the light derivative obtained after the derivation of the light labeling agent is represented as A1, and the concentration of the biogenic amine is represented as C1; the peak area of the heavy derivative obtained after the heavy labeling reagent is derived is marked as A2, and the concentration of the biogenic amine is shown as C2, so that the concentration of the biogenic amine in the sample can be obtained according to the formula C1/C2-A1/A2.

Background

The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

High performance liquid chromatography-mass spectrometry tandem technology (HPLC-MS/MS) is widely applied to the research fields of life analysis, environmental detection, food evaluation and the like due to high sensitivity and high selectivity. Targeted and semi-targeted analytes in a sample can be selectively monitored using a Selective Reaction Monitoring (SRM) or multi-stage reactive ion monitoring (MRM) mode of HPLC-MS/MS. However, the presence of matrix effects significantly compromises the analytical performance of HPLC-MS/MS.

In recent years, stable isotope coding technology has attracted much attention, especially stable isotope coding derivatization technology, isotope derivatives of a class of analytes with the same functional group can be obtained by means of light/heavy isotope coding derivatization reagents, and HPLC-MS/MS quantitative analysis can be carried out by taking heavy isotope derivatives as internal standard substances, so that the influence of matrix effect can be effectively calibrated. However, the current chemical labeling methods have more or less defects, such as slow labeling reaction rate, low labeling yield, weak labeling product signal, poor labeling accuracy and sensitivity, and the like, and many labeling reagents are complicated to synthesize and are not easy to obtain corresponding isotope products, thereby limiting their wide use.

Disclosure of Invention

Aiming at the problems, the invention provides a stable isotope amino compound labeling reagent and a synthesis method and application thereof, and the labeling reagent has the characteristics of high labeling reaction rate, high labeling product signal, strong accuracy and high sensitivity of mass spectrum detection of amino compounds and simple and convenient synthesis. In order to achieve the purpose, the invention discloses the following technical scheme:

in a first aspect of the present invention, there is provided a stable isotope amino compound labeling reagent having a chemical name of: [ d₄]-2- (9-acridone) -ethylchloroformate, the chemical formula of the labeling reagent being shown in formula 1:

wherein: x ═ D (i.e. deuterium as an isotope of hydrogen), and the labeling reagent is [ D ═ D₄]-2- (9-acridone) -ethylchloroformate, abbreviated AEC-R- [ d₄]。

Further, in the formula 1, R is any one of F (fluorine), Cl (chlorine), Br (bromine), I (iodine) and other elements, preferably Cl element, wherein the acid chloride is stable and easily available.

Further, n ═ 2 or 3 in formula 1, the length of the carbon chain should not be too long, and too long may result in unstable structure of the derivatizing reagent.

In a second aspect of the present invention, there is provided a method for synthesizing the stable isotope amino compound labeling reagent, comprising the steps of:

(1) providing an intermediate I: [ d₅]-N-phenyl anthranilic acid.

(2) Synthesis of intermediate II: dissolving the intermediate I in concentrated sulfuric acid, heating for reaction, cooling, pouring the cooled cooling liquid into boiling water, separating out the precipitated solid product, washing the solid product, and drying to obtain the intermediate IAn intermediate II: [ d₄]-acridone.

(3) Synthesis of intermediate III: dissolving the intermediate II and ethylene carbonate into dimethyl sulfoxide, adding potassium hydroxide, heating for reaction, cooling, pouring the obtained cooling liquid into a salt water solution, separating out a precipitated solid product, washing the solid product, drying, and recrystallizing to obtain an intermediate III: [ d₀/d₄]-2- (9-acridone) ethanol.

(4) Under the cooling condition, triethylamine is dripped into the solution dissolved with the solid phosgene; and then adding a solution in which the intermediate III is dissolved, and separating a solid product after the reaction is finished to obtain the marking reagent with the chemical structural formula shown in the formula 1.

Further, in step (1), the synthesis of the intermediate I comprises the steps of:

(i) dissolving o-aminobenzoic acid, copper powder and potassium carbonate into dimethyl sulfoxide, uniformly mixing, and adding deuterated bromobenzene-d₅Then, the reaction solution was heated to react, and after the reaction was completed, the reaction solution was filtered to collect the filtrate.

(ii) And pouring the filtrate into water, adjusting the pH value to 5-6 by using concentrated hydrochloric acid, and filtering and drying the precipitated solid to obtain an intermediate I.

Further, in the step (i), the heating reaction is carried out by adopting oil bath heating, and the heating temperature is 145-150 ℃.

Further, in step (i), the anthranilic acid is reacted with deuterated bromobenzene-d₅The molar ratio of (A) to (B) is 1-1.5: 1; the addition amount of the copper powder is anthranilic acid and deuterated bromobenzene-d₅0.05 to 0.1 times of the total molar amount; the addition amount of the potassium carbonate is anthranilic acid and deuterated bromobenzene-d₅The total molar weight is 1.1-1.5 times, wherein the copper powder is added as a catalyst, and the potassium carbonate is an acid-binding agent.

Further, in the step (2), the heating reaction temperature is 95-100 ℃, and the reaction time is 1.5-2.5 h.

In the step (3), the molar ratio of the intermediate II to the ethylene carbonate is 1: 1.2-1.5.

Furthermore, in the step (3), the addition amount of the potassium hydroxide is 0.01-0.04 times of the molar weight of the ethylene carbonate, the potassium hydroxide is mainly used for promoting the ethylene carbonate to be hydrolyzed,

further, in the step (3), the heating reaction is carried out by adopting oil bath heating, the heating temperature is 140-150 ℃, and the reaction time is 5-6.5 h.

Further, in the step (3), the intermediate III is recrystallized by acetonitrile to obtain a light yellow crystal.

Further, in the step (4), the solid phosgene is dissolved in the dichloromethane, so that a solution in which the solid phosgene is dissolved is obtained.

Further, in the step (4), the addition amount of the triethylamine is 2.7-3.5% of the mass of the solid phosgene.

Further, in the step (4), the molar ratio of the intermediate III to the solid phosgene is 1: 1.8-2.3.

Further, in the step (4), the reaction is firstly carried out in an ice bath for 4 hours, then the temperature is raised to room temperature, the reaction is continued for 5 hours, after the reaction is finished, the reaction solution is filtered, the filtrate is decompressed and evaporated by distillation by a rotary evaporator, and is recrystallized by acetonitrile, so that the labeled reagent shown in the formula 1 is obtained.

In the third aspect of the present invention, the stable isotope amino compound labeled reagent is disclosed to be used in the research fields of life analysis, environmental analysis, food analysis, and the like, preferably for detecting the concentration of biogenic amine in an analyte.

Further, the method for detecting the concentration of the biogenic amine in the analyte comprises the following steps:

s1: preparing borax/boric acid buffer solution and preparing [ d ]₀]Preparing [ d ] by using acetonitrile solution of (E) -2- (9-acridone) ethyl chloroformate as light marking reagent (X ═ H) solution₄]-2- (9-acridone) ethylchloroformate in acetonitrile as a solution of heavy labelling reagent (X ═ D).

S2: and mixing the borax/boric acid buffer solution, a sample to be detected containing biogenic amine and a light marking reagent solution in sequence, and reacting to obtain a reaction solution a.

S3: and mixing the borax/boric acid buffer solution, a sample to be detected containing biogenic amine and a heavy marking reagent solution in sequence and then reacting to obtain a reaction solution b.

S4: and mixing the reaction solution a and the reaction solution b in equal volume, and then analyzing by adopting HPLC-MS/MS: the peak area of the light derivative obtained after the derivation of the light labeling agent is represented as A1, and the concentration of the biogenic amine is represented as C1; the peak area of the heavy derivative obtained after the heavy labeling reagent is derived is marked as A2, and the concentration of the biogenic amine is shown as C2, so that the concentration of the biogenic amine in the sample can be obtained according to the formula C1/C2-A1/A2.

Further, said [ d ]₀]Acquisition of (E) -2- (9-acridone) ethylchloroformate]CN202010117911.8, Chinese patent document entitled "a reagent for labeling acridone fluorescent amine compounds and a synthesis method and application thereof".

Further, the pH of the borax/boric acid buffer solution was 9.5, and the amino compound was rapidly labeled in this concentration range.

Compared with the prior art, the invention has the following beneficial effects:

(1) the isotope labeling reagent of the invention takes acridone as a parent ring and an isotope labeling group, takes chloroformate as a reaction group, utilizes the rapid reaction principle of acyl chloride and an amino compound, selectively labels the amino compound by adjusting the pH value and the reaction time, and has the advantages of simple and convenient synthesis method, high labeling reaction rate, strong signal of a labeled product, high labeling yield, high selectivity to amino, and the like, and enhances the accuracy and the sensitivity of mass spectrum detection of the amino compound.

(2) The isotopic deuterated labeling reagent obtained by the invention has stable isotopic labeling position, chemical purity of more than 99.5 percent and isotopic abundance of more than 99.0 percent, can rapidly label amino compounds in borax/boric acid buffer solution, shows high sensitivity and excellent selectivity to the amino compounds, realizes absolute quantification to the amino compounds, and is simple, convenient, sensitive and rapid to detect the amino compounds, and has accurate results.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a nuclear magnetic 1HNMR map of a heavy duty labeling reagent prepared according to a first embodiment of the present invention.

FIG. 2 is a nuclear magnetic 1HNMR map of a lightweight labeling agent prepared according to a second embodiment of the present invention.

FIG. 3 is an MRM ion chromatography flowsheet of a biogenic amine standard detected by an embodiment of the invention.

FIG. 4 is a secondary mass spectrum of a light derivative of cadaverine in an example of the invention.

Detailed Description

In the following description, further specific details of the invention are set forth in order to provide a thorough understanding of the invention. The terminology used in the description of the invention herein is for the purpose of describing particular advantages and features of the invention only and is not intended to be limiting of the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Unless otherwise indicated, the drugs or agents used in the present invention are used according to the instructions of the product or by the conventional methods in the art.

As mentioned above, the current chemical labeling methods have more or less defects, such as slow labeling reaction rate, low labeling yield, weak labeling product signal, poor labeling accuracy and sensitivity, etc., and many labeling reagents are complicated to synthesize and are not easy to obtain corresponding isotope products. Therefore, the invention provides a stable isotope amino compound marking reagent and a synthesis method thereof, and the method is further explained according to the attached drawings and the detailed description of the specification.

First embodiment

Heavy marking reagents [ D ] are carried out with reference to scheme 1 (wherein X ═ D) below₄]-synthesis of 2- (9-acridone) ethylchloroformate comprising the steps of:

1. intermediate I: [ d₅]Preparation of-N-Phenylanthranilic acid:

adding 20g of anthranilic acid, 1g of copper powder and 10g of potassium carbonate into a 250mL three-neck flask, then adding 150mL of dimethyl sulfoxide as a solvent, stirring and mixing uniformly, and adding 15g of deuterated bromobenzene-d into the obtained mixed solution₅Then stirred in an oil bath at 150 ℃ for 5 hours (o-aminobenzoic acid and deuterated bromobenzene-d)₅To effect a substitution reaction).

And after the reaction is finished, filtering to remove redundant copper powder and potassium carbonate, and collecting filtrate. Pouring the filtrate into 200mL of clear water, adjusting the pH value to 5 by using concentrated hydrochloric acid, fully stirring, filtering after a solid product is completely separated out, putting the obtained solid product into an oven, and drying the solid product to constant weight at 50 ℃ to obtain 17.1g of gray powdery product, namely an intermediate I: [ d₅]-N-phenyl anthranilic acid, the product was found to be 83% yield.

2. Intermediate II: [ d₄]-preparation of acridone:

15g of the intermediate I synthesized in the previous step is dissolved in 40mL of concentrated sulfuric acid (98 wt.%), fully stirred and dissolved, heated in an oil bath, and stirred for reaction for 2 hours while controlling the reaction temperature at 100 ℃ (the intermediate I is heated in the concentrated sulfuric acid for cyclization).

After the reaction is finished, cooling to room temperature, then slowly pouring the cooled reaction liquid into 300mL of boiling water along the wall of a beaker, stirring for 5 minutes, after a solid product is completely separated out, filtering out the solid product, washing the solid product with water twice, and then boiling and washing the solid product with 5% potassium carbonate solution twice to obtain 12g of a green powdery product, namely an intermediate II: [ d₄]-acridone, giving the product a yield of 85.2%.

3. Intermediate III: [ d₄]Preparation of-2- (9-acridone) ethanol:

5g of intermediate II synthesized in the previous step, 3g of ethylene carbonate and 0.25g of potassium hydroxide were charged into a 250mL three-necked flask, and then 100mL of dimethyl sulfoxide was added thereto, and the mixture was dissolved by stirring and reacted at 150 ℃ for 4 hours (intermediate II was substituted with ethylene carbonate).

After the reaction is finished, cooling the reaction solution to room temperature, pouring the reaction solution into 200mL of a salt solution, continuously stirring to separate out a light yellow solid, and washing the obtained light yellow solid product twice after suction filtration to obtain a crude product; after air drying, recrystallizing with acetonitrile for 2 times to obtain a light yellow crystal, namely an intermediate III: [ d₄]-2- (9-acridone) ethanol, giving the product a yield of 80%.

4. And (3) target products: [ d₄]Preparation of (E) -2- (9-acridone) ethylchloroformate:

5g of solid phosgene and 100mL of dichloromethane are added into a 500mL single-neck round-bottom flask, 50 mu L of triethylamine is added under the condition of ice bath cooling and stirring, then the dichloromethane solution dissolved with the intermediate III prepared in the previous step is continuously and slowly dripped, the temperature naturally rises to room temperature after 4 hours of reaction, and the reaction is continuously carried out for 5 hours (the intermediate III and the solid phosgene are subjected to acylation reaction).

And after the reaction is finished, carrying out suction filtration on the reaction solution, carrying out reduced pressure evaporation on the filtrate by using a rotary evaporator, and recrystallizing for 3 times by using acetonitrile to obtain a target product A, namely a heavy-duty labeled reagent: [ d₄]-2- (9-acridone) ethylchloroformate, and the yield of the objective product was found to be 74%.

Characterization of the target product A synthesized in this example, nuclear magnetism¹The H NMR spectrum is shown in FIG. 1:

¹HNMR(500MHz,DMSO)δ8.36(dd,J＝8.0,1.7Hz,1H),7.92(d,J＝3.1Hz,1H),7.82(ddd,J＝8.7,6.9,1.8Hz,1H),7.33(s,1H),6.49(s,4H),4.61(t,J＝6.3Hz,2H),3.90(t,J＝6.3Hz,2H).

¹³CNMR(126MHz,DMSO)δ176.97,142.58,134.43,127.00,122.02,121.68,116.91,58.70,48.05。

Found:C62.72,H2.69Cl11.75,N4.55,O15.65；Calculated:C62.95,H2.61Cl11.65,N4.59,O15.74.

MS:m/z:[M+H]⁺＝306.5.

it can be seen that this example was successfulThe target product a, noted heavy labeling reagent, was synthesized: [ d₄]-2- (9-acridone) ethylchloroformate.

Second embodiment

Reference is made to the application number]CN202010117911.8, a synthetic route in Chinese patent literature entitled "a light-duty labeling reagent of acridone fluorescent amine compounds and a synthetic method and application thereof" for preparing a light-duty labeling reagent [ d₀]-2- (9-acridone) ethylchloroformate, namely the target product B.

Characterization of the target product B synthesized in this example, nuclear magnetism¹The H NMR spectrum is shown in FIG. 2:

¹HNMR(500MHz,DMSO)δ8.36(dd,J＝8.0,1.5Hz,2H),7.92(d,J＝8.8Hz,2H),7.82(ddd,J＝8.7,7.0,1.6Hz,2H),7.33(t,J＝7.4Hz,2H),4.61(t,J＝6.3Hz,2H),3.90(t,J＝6.3Hz,2H).

¹³CNMR(126MHz,DMSO)δ176.96,142.44,142.32,134.39,126.99,122.02,121.65,116.88,58.59,48.03

Found:Found:C63.79,H3.99Cl11.79,N4.65,O15.95；Calculated:C63.69,H4.01Cl11.75,N4.64,O15.91.

MS:m/z:[M+H]⁺＝302.1.

it can be seen that this example successfully synthesized target product B, which is designated as light labeling reagent: [ d₀]-2- (9-acridone) ethylchloroformate.

Third embodiment

A method for detecting the concentration of biogenic amine in an analyte by using a stable isotope amino compound labeled reagent, which comprises the following steps: the heavy-duty labeling reagent and the light-duty labeling reagent prepared in the first embodiment and the second embodiment respectively are used for testing biogenic amines, and the following specific steps are carried out:

the first step is as follows: preparing borax/boric acid buffer solution with pH of 9.5; the preparation concentration is 1 multiplied by 10^-6A biological amine standard substance acetonitrile solution of mol/L; the preparation concentration is 1 multiplied by 10^-4mol/L of [ d₀]-a solution of 2- (9-acridone) ethylchloroformate in acetonitrile as a solution of a light labeling reagent; the preparation concentration is 1 multiplied by 10^-4mol/L of [ d₄]And (3) using an acetonitrile solution of the (E) -2- (9-acridone) ethyl chloroformate as a heavy-duty labeling reagent solution for standby.

The second step is that: and sequentially adding 200 mu L of the borax/boric acid buffer solution, 100 mu L of the biogenic amine standard solution and 50 mu L of the light marking reagent solution into a 2mL amputated bottle, and reacting for 5min at room temperature to obtain reaction liquid a.

The third step: and sequentially adding 200 mu L of borax/boric acid buffer solution, 100 mu L of biogenic amine standard solution and 50 mu L of fruit juice actual sample subjected to column purification by heavy marking reagent solution into a 2mL amputated bottle, and reacting for 5min at room temperature to obtain reaction liquid b.

The fourth step: mixing the reaction liquid a and the reaction liquid b according to the volume ratio of 1:1, and injecting 1 microliter of the mixture for HPLC-MS/MS analysis, wherein: the peak area of the light derivative obtained after the derivation of the light labeling agent is represented as A1, and the concentration of the biogenic amine is represented as C1; the peak area of the heavy derivative obtained after the heavy marking reagent is derived is marked as A2, and the concentration of the biogenic amine in the fruit juice actual sample is expressed as C2, so that the concentration of the biogenic amine in the fruit juice actual sample can be obtained according to the formula C1/C2-A1/A2.

The reaction of the labeling reagent and biogenic amine is a substitution reaction, and the reaction formula is shown as formula 2 (wherein, X ═ H or D). The flow chart of the MRM ion chromatogram of 8 kinds of biogenic amine standard substances obtained by detection is shown in figure 3, wherein the ratio of the light peak area to the heavy peak area is 5:1, complete separation of 8 biogenic amine analytes is realized within 10 minutes, the retention time difference of the light/heavy derivatives is less than 0.05 minute, and the requirement of mass spectrum quantification is completely met.

The isotope labeling reagent synthesized by the method takes acridone as a parent ring and an isotope labeling group, takes chloroformate as a reaction group, selectively labels an amino compound, has the advantages of high labeling reaction rate, strong signal of a labeled product, high labeling yield, high amino selectivity, and the like, and enhances the accuracy and sensitivity of mass spectrum detection of the amino compound. The N atom in the structure of acridone is weak in alkalinity but has electrons on the N atom, so that ionization of a derivative product and sensitive qualitative of mass spectrum are facilitated, protonation can be performed under an acidic condition, a strong mass spectrum sensitization effect is achieved, and the detection sensitivity of biogenic amine is improved to a great extent.

The biological amine is quantified by an Agilent 1290 type ultra-high performance liquid chromatography system and a 6460 type triple quadrupole tandem mass spectrometer, and is provided with an electrospray ionization source (ESI). Chromatographic conditions are as follows: the mobile phase A is 5% acetonitrile + 95% water, the mobile phase B is 100% acetonitrile, and formic acid with the concentration of 0.1% is added in the mobile phase to enhance the ionization efficiency of the analyte; gradient elution is adopted, the initial gradient of the mobile phase B is set to be 30%, the initial gradient is set to be 100% in 8min, and the mobile phase B is kept for 5 min; the amount of sample was 1. mu.L, and the flow rate was 0.2 mL/min. Mass spectrum conditions: ESI: positive ion mode, dry gas temperature: 300 ℃, flow rate: 10L/min, atomization pressure: 40psi, sheath gas temperature: 250 ℃, flow rate: 8L/min, capillary Voltage: 3.5 KV. The collision voltage (fragment) is shown in table 1.

TABLE 1 Collision Voltage and cracking energy parameters

The derivatives all show stronger [ M + H]⁺The signal, the light derivative, mainly produced fragment ions of m/z222.2 and 238.3, the heavy derivative, mainly produced fragment ions of m/z226.2 and 242.3, the mass spectrum fragmentation diagram represented by the light derivative of cadaverine is shown in fig. 4, and the mass spectrum fragmentation process is reasonable.

The above description is only illustrative of several embodiments of the present invention and should not be taken as limiting the scope of the invention. It should be noted that other persons skilled in the art can make modifications, substitutions, improvements and the like without departing from the spirit and scope of the present invention, and all of them belong to the protection scope of the present invention. Therefore, the scope of the invention is to be determined by the claims as set forth below.