WO2023124266A1 - 一种检测唾液酸糖基酪蛋白糖巨肽的方法 - Google Patents

一种检测唾液酸糖基酪蛋白糖巨肽的方法 Download PDF

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WO2023124266A1
WO2023124266A1 PCT/CN2022/119544 CN2022119544W WO2023124266A1 WO 2023124266 A1 WO2023124266 A1 WO 2023124266A1 CN 2022119544 W CN2022119544 W CN 2022119544W WO 2023124266 A1 WO2023124266 A1 WO 2023124266A1
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mesoporous silica
glycomacropeptide
acid
casein
sample
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张毅
魏皓东
冯永巍
何永熙
鲁晨辉
徐力志
王文龙
沈晓芳
严秀平
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Jiangnan University
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    • B01D15/26—Selective adsorption, e.g. chromatography characterised by the separation mechanism
    • B01D15/38—Selective adsorption, e.g. chromatography characterised by the separation mechanism involving specific interaction not covered by one or more of groups B01D15/265 and B01D15/30 - B01D15/36, e.g. affinity, ligand exchange or chiral chromatography
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    • B01D15/388—Selective adsorption, e.g. chromatography characterised by the separation mechanism involving specific interaction not covered by one or more of groups B01D15/265 and B01D15/30 - B01D15/36, e.g. affinity, ligand exchange or chiral chromatography using an external stimulus modifying the pH
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    • G01N30/02—Column chromatography
    • G01N30/86—Signal analysis
    • G01N30/8624—Detection of slopes or peaks; baseline correction
    • G01N30/8631—Peaks
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    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
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    • G—PHYSICS
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    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
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    • G—PHYSICS
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    • G01N30/02—Column chromatography
    • G01N30/04—Preparation or injection of sample to be analysed
    • G01N30/06—Preparation
    • G01N30/14—Preparation by elimination of some components
    • G01N2030/143—Preparation by elimination of some components selective absorption
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    • G01N30/02—Column chromatography
    • G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
    • G01N2030/8809—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample
    • G01N2030/8813—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample biological materials
    • G01N2030/8831—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample biological materials involving peptides or proteins

Definitions

  • the invention relates to the technical field of food analysis and detection, in particular to a detection method for casein glycomacropeptide in phenylketonuria formula food for special medical purposes, and in particular to a boron affinity column enrichment-liquid chromatography-tandem mass spectrometry detection method Method for casein-glycomacropeptides bearing sialoglycosyl groups.
  • Phenylketonuria referred to as PKU
  • patients cannot metabolize phenylalanine ingested through diet due to the lack or low activity of phenylalanine hydroxylase in the body, so they need to take whole protein replacement special medicine with low phenylalanine for life Use Formula food meets daily nutritional needs.
  • Casein glycomacropeptide CGMP is a polypeptide of amino acid sequence 106-169 produced by enzymolysis of ⁇ -casein by rennet, without phenylalanine.
  • casein glycomacropeptide contains various groups such as sialic acid, galactose, acetylgalactosamine and phosphoric acid, among which sialic acid has the functions of promoting brain development of infants and young children, antibacterial and anti-inflammatory, etc.
  • Patient is an ideal special medical purpose formula food. Due to the special structure of casein glycomacropeptide, complex preparation and high cost, it is necessary to determine the true composition of the polypeptide components in PKU formula food for special medical purposes and the exact content of casein glycomacropeptide with sialic acid sugar group in it. Qualitative and quantitative analysis of casein glycomacropeptide with sialyl glycosyl in PKU formula food for special medical purpose.
  • Liquid chromatography tandem mass spectrometry has high sensitivity and accuracy for the analysis of peptides.
  • the coexistence of peptides and proteins will reduce the ionization efficiency of casein glycomacropeptide, thereby reducing its response value.
  • Casein glycomacropeptide has multiple glycosylation sites, which is a typical glycopeptide, and the phenylboronic acid group on the boron affinity column has a special affinity for the cis-o-diol structure on the sugar group, which can Realize the enrichment and purification of glycopeptides.
  • Chinese invention patent "A method for enriching glycopeptides with phenylboronic acid materials” utilizes a boron affinity column to enrich glycopeptides.
  • the boron affinity column filler used in this method is phenylboronic acid modified silica spheres with a particle size of 2-50 meters;
  • the applicable protein sources are proteins in biological samples such as tissues, cells, serum or urine, or transferrin, fetal Globulin, horseradish peroxidase, ribonuclease B;
  • the enzymes used for proteolysis are trypsin, endopeptidase, pepsin, and chymotrypsin;
  • the washing solvent must have organic solvents such as acetonitrile or methanol, and the pH is neutral; Organic solvents such as acetonitrile or methanol must be used for desolventization.
  • the boron affinity column filler used in this method is agarose gel modified with phenylboronic acid; an automated chromatographic system and gradient mobile phase are used during boron affinity column chromatography; C18 solid phase extraction must be used after boron affinity column chromatography Column desalting; applicable samples are glycoproteins in human serum and trypsin-digested glycopeptides; finally, glycopeptides are analyzed by alternating electron transfer dissociation (ETD) and collision-induced dissociation (CID) tandem mass spectrometry; used in the diagnosis and treatment of diabetes.
  • ETD electron transfer dissociation
  • CID collision-induced dissociation
  • composition of biological samples and food samples is very different.
  • ingredients such as oil, vitamins, and stabilizers are added to food.
  • the existence of these additives makes the pretreatment and analysis process of food samples completely different from biological samples.
  • the purpose of the present invention is to provide a sensitive and rapid boron-affinity silicon column purification-liquid chromatography-tandem mass spectrometry method for detecting sialoglycosylcasein glycomacropeptide in phenylketonuria formula food for special medical purposes.
  • a method for detecting sialyl glycosylcasein glycomacropeptide by boron affinity column enrichment-liquid chromatography-tandem mass spectrometry of the present invention comprises the following steps : Using phenylboronic acid-modified mesoporous silica as boron affinity column filler, using the affinity properties of phenylboronic acid to the special glycosyl-sialic acid on serine and threonine residues in casein glycomacropeptide, by changing the pH regulation Adsorption and elution of casein glycomacropeptide with sialyl sugar groups, followed by liquid chromatography-tandem mass spectrometry analysis, to realize the detection of casein glycomacropeptide in phenylketonuria special medical purpose formula food; the steps are as follows : (1) Sample preparation; (2) Boron affinity column enrichment and purification; (3) Liquid chromatography-tan
  • sample preparation accurately weigh 5-10 g of the fully homogenized sample into a beaker, add 20-30 mL of deionized water to dissolve, stir magnetically, heat to 90°C to dissolve, and cool to room temperature Adjust the pH to 4.5-5.0 with hydrochloric acid, dilute to 50mL, transfer to a centrifuge tube, centrifuge, and take 20mL of the supernatant as the sample solution;
  • step (2) boron affinity column enrichment purification:
  • the preparation method of the boron affinity column Step1 synthesis of mesoporous silica; Step2 amination of mesoporous silica; Step3 phenylboronic acid modification of aminated mesoporous silica; Step4 preparation of boron affinity column;
  • step (3) liquid chromatography-tandem mass spectrometry analysis: after the purified liquid is filtered through a filter membrane, it is detected by liquid chromatography-tandem mass spectrometer to obtain the ion flow chromatogram and mass spectrum of casein glycomacropeptide, and the ion flow The peak area of the chromatogram was brought into the standard curve analysis and calculation, and combined with the mass spectrum for structural identification, so as to obtain the content and structure information of the casein glycomacropeptide in the sample.
  • step (2) the synthesis of Step1 mesoporous silica: 0.25-0.3g cetyltrimethylammonium bromide is dissolved in 240-250mL water, and 0.8-1.0mL NaOH (2.0 mol/L), the temperature was raised to 80°C, and vigorously stirred, 5-7mL tetraethyl orthosilicate was added dropwise into the solution, and the mixture was stirred and reacted for 2-5h to produce white flocs.
  • Step 2 amination of mesoporous silica weigh 0.3-0.4g of mesoporous silica, disperse in 80-90mL of anhydrous toluene, add 0.5-2mL of aminopropyl tris Ethoxysilane, nitrogen protection, heating and reflux for 20-24h, centrifugation, washing the precipitate with toluene and methanol three times and vacuum drying to obtain aminated mesoporous silica.
  • step (2) Step3 modification of aminated mesoporous silica with phenylboronic acid: Weigh 0.2-0.3g of aminated mesoporous silica and disperse it in 20-25mL dimethyl sulfoxide, mix 0.8- Add 1.0g of 4-carboxyphenylboronic acid, 0.1-0.2g of N-hydroxysuccinimide, and 0.05-0.1g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride in sequence for 5 -React in 10mL dimethyl sulfoxide, stir at room temperature for 30-60min, then add to the above-mentioned aminated mesoporous silica dispersion, stir at room temperature for 10-24h, centrifuge, use dimethyl sulfoxide, water, methanol for precipitation washing three times respectively, and drying in vacuum to obtain phenylboronic acid-modified mesoporous silica;
  • Step4 boron affinity column preparation: put 20 mg of phenylboronic acid-modified mesoporous silica into a polyethylene solid-phase extraction tube, add a sieve plate, and compact to obtain a boron affinity column. and column.
  • the mobile phase ratio for redissolving the polypeptide is: the volume ratio of water and acetonitrile in the acetonitrile aqueous solution containing 0.1% formic acid is 90:10.
  • the chromatographic conditions are: chromatographic column: Agilent AdvanceBio PeptideMapping column; column temperature: 40°C; injection volume: 10 ⁇ L; flow rate 0.3mL/min; mobile phase A is acetonitrile containing 0.1% formic acid Aqueous solution, the volume of water and acetonitrile is 90:10; mobile phase B is acetonitrile solution containing 0.1% formic acid, gradient elution: 0-5min, 98%A; 5-55min, 98%-50%A; 55-60min, 50%-10%A; 60-75min, 10%A.
  • the mass spectrometry conditions are: electrospray ion source; positive ion scan; spray voltage: 5500V; temperature: 450°C; detection method: data-dependent scan.
  • step (3) the method for making the standard curve is: prepare a casein glycomacropeptide standard solution with a concentration of 0.1-50 ⁇ g/mL, take the casein glycomacropeptide concentration as the abscissa, and the peak area as the ordinate , to make a standard curve.
  • the present invention uses phenylboronic acid-modified mesoporous silica as the boron affinity column filler, and its preparation process is simple, and the special glycosyl-sialic acid on the serine and threonine residues in casein glycomacropeptide is utilized in the preparation process.
  • the affinity characteristics at a specific pH achieve high selective adsorption and high recovery elution, liquid chromatography-tandem mass spectrometry analysis of casein glycomacropeptide in the eluent, sensitive and efficient realization of special medical applications for phenylketonuria Detection of casein-glycomacropeptide in formula.
  • Fig. 1 is a schematic diagram of the operation flow of the present invention.
  • FIG. 2 is a transmission electron microscope image of the phenylboronic acid-modified mesoporous silica synthesized in Example 1.
  • FIG. 2 is a transmission electron microscope image of the phenylboronic acid-modified mesoporous silica synthesized in Example 1.
  • FIG. 3 is an elemental analysis diagram of the phenylboronic acid-modified mesoporous silica synthesized in Example 1.
  • FIG. 3 is an elemental analysis diagram of the phenylboronic acid-modified mesoporous silica synthesized in Example 1.
  • Figure 4 is the MALDI-TOF mass spectrogram before and after enrichment in Example 2.
  • a boron affinity column enrichment-liquid chromatography-tandem mass spectrometry method for detecting sialoglycosylcasein glycomacropeptide of the present invention comprises the following steps: using phenylboronic acid-modified mesoporous silica as boron affinity column filler , using the affinity of phenylboronic acid to the special glycosyl-sialic acid on the serine and threonine residues in casein glycomacropeptide, the adsorption and washing of casein glycomacropeptide with sialic acid sugar groups were regulated by changing the pH Then, liquid chromatography-tandem mass spectrometry analysis was used to realize the detection of casein glycomacropeptide in formula food for special medical purposes of phenylketonuria; the steps are as follows: (1) sample preparation; (2) boron affinity column enrichment Purification; (3) liquid chromatography-tandem mass spectrometry analysis.
  • Sample preparation Accurately weigh 5g of a fully homogenized sample into a beaker, add 30mL of deionized water to dissolve, stir magnetically, heat to 100°C to dissolve, cool to room temperature, adjust pH to 5.0 with hydrochloric acid, and dilute to 60mL , transferred to a centrifuge tube, centrifuged, and 20 mL of the supernatant was taken as the sample solution.
  • a kind of phenylboronic acid-modified mesoporous silica of the present invention is the preparation of the boron-affinity silicon column of filler:
  • Step1 Synthesis of mesoporous silica: Dissolve 0.28g of cetyltrimethylammonium bromide in 240mL of water, add 0.8mL of NaOH (2.0mol/L) to it, raise the temperature to 80°C, stir vigorously, and dissolve 5mL of orthosilicon Ethyl acetate was added dropwise to the solution, and the mixture was stirred for 5 hours to produce white flocs.
  • Step2 Amination of mesoporous silica Weigh 0.3g of mesoporous silica, disperse it in 90mL of anhydrous toluene, add 2mL of aminopropyltriethoxysilane, heat and reflux under nitrogen protection for 23h, centrifuge, and use toluene for precipitation and methanol were washed three times and then vacuum-dried to obtain aminated mesoporous silica;
  • Step3 Phenylboronic acid modification of aminated mesoporous silica: Weigh 0.3 g of aminated mesoporous silica and disperse it in 20 mL of dimethyl sulfoxide. Add 1.0 g of 4-carboxyphenylboronic acid, 0.1 g of N-hydroxysuccinimide, and 0.09 g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride to 10 mL of dimethylmethylene React in sulfone, stir at room temperature for 50 min, add to the above-mentioned aminated mesoporous silica dispersion, stir at room temperature for 24 h, centrifuge, wash the precipitate three times with dimethyl sulfoxide, water and methanol, and dry in vacuum to obtain benzene Boric acid-modified mesoporous silica.
  • Step4 Boron affinity column preparation: Put 50 mg of phenylboronic acid-modified mesoporous silica into a polyethylene solid-phase extraction tube, add a sieve plate, and compact to prepare a boron affinity column.
  • Tandem mass spectrometer detection, mass spectrometry conditions electrospray ion source; positive ion scan; spray voltage: 5500V; temperature: 400-450°C; detection method: data-dependent scan.
  • concentration of casein glycomacropeptide is taken as the abscissa, and the peak area is taken as the ordinate to make a standard curve.
  • the peak area of the ion current chromatogram was brought into the standard curve analysis and calculation, and combined with the mass spectrum for structural identification, so as to obtain the content and structure information of the casein glycomacropeptide with sialyl sugar groups in the sample.
  • Fig. 1 is a schematic diagram of the operation flow of the present invention.
  • Fig. 4 is the MALDI-TOF mass spectrogram before and after enrichment in embodiment 2
  • casein glycomacropeptide is the polypeptide in the range of 5000-7000Da, it can be seen that the content of polypeptides with a mass-to-charge ratio above 4000Da increases significantly before and after enrichment, so for Phenylboronic acid modified mesoporous silica has enrichment effect on casein glycomacropeptide.
  • Figure 2 is a transmission electron microscope image of the phenylboronic acid-modified mesoporous silica synthesized in Example 1. It can be seen from Figure (a) that the synthesized mesoporous silica is a spherical material with a diameter of about 100 nm, and the dispersion Good; it can be seen from Figure (b) that there are mesopores of about 2-3 nm on the surface of the silica microspheres.
  • Fig. 3 is the scanning electron microscope and the elemental spectrogram of the mesoporous silica modified with phenylboronic acid synthesized in Example 1. It can be seen that the element distribution of B, C, N, O, and Si is consistent with the distribution of the material. Where there are more silicon oxide materials, the elements also increase accordingly, and the content of element B is finally calculated to be 9.23%.
  • Example 2 a boron affinity column enrichment-liquid chromatography-tandem mass spectrometry method for detecting sialyl glycosylcasein glycomacropeptide of the present invention comprises the following steps:
  • Sample preparation Accurately weigh 10g of a fully homogenized sample into a beaker, add 25mL of deionized water to dissolve, stir magnetically, heat to 90°C to dissolve, cool to room temperature, adjust pH to 4.8 with hydrochloric acid, and dilute to 50mL , transferred to a centrifuge tube, centrifuged, and 20 mL of the supernatant was taken as the sample solution.
  • a kind of phenylboronic acid modified mesoporous silica of the present invention is the preparation of the boron-affinity silicon column of filler:
  • Step1 mesoporous silica Dissolve 0.25g of cetyltrimethylammonium bromide in 250mL of water, add 1.0mL of NaOH (2.0mol/L) to it, heat up to 80°C, stir vigorously, and dissolve 7mL of Ethyl silicate was added dropwise into the solution, and the mixture was stirred for 2 hours to produce white floc.
  • Step2 Amination of mesoporous silica Weigh 0.35g of mesoporous silica, disperse in 80mL of anhydrous toluene, add 1.5mL of aminopropyltriethoxysilane, heat and reflux under nitrogen protection for 20h, centrifuge, and use for precipitation Toluene and methanol were washed three times and then vacuum-dried to obtain aminated mesoporous silica;
  • Step3 Phenylboronic acid modification of aminated mesoporous silica: Weigh 0.25 g of aminated mesoporous silica and disperse it in 25 mL of dimethyl sulfoxide. Add 0.8 g of 4-carboxyphenylboronic acid, 0.2 g of N-hydroxysuccinimide, and 0.05 g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride to 5 mL of dimethyl ethylene React in sulfone, stir at room temperature for 30 minutes, add to the above-mentioned aminated mesoporous silica dispersion, stir at room temperature for 20 hours, centrifuge, wash the precipitate three times with dimethyl sulfoxide, water and methanol, and dry in vacuum to obtain benzene Boric acid-modified mesoporous silica.
  • Step4 Boron affinity column preparation: put 20 mg of phenylboronic acid-modified mesoporous silica into a polyethylene solid-phase extraction tube, add a sieve plate, and compact to prepare a boron affinity column.
  • chromatographic conditions are: chromatographic column: Agilent AdvanceBio PeptideMapping column; Column temperature: 40 °C; Injection volume: 10mL; Flow velocity 0.3mL/min; Mobile phase A is the acetonitrile aqueous solution containing 0.1% formic acid, described water and The volume of acetonitrile is 90:10; mobile phase B is acetonitrile solution containing 0.1% formic acid, gradient elution: 0-5min, 98%A; 5-55min, 98%-50%A; 55-60min, 50%- 10%A; 60-75min, 10%A.
  • the mass spectrometry conditions are: electrospray ion source; positive ion scan; spray voltage: 5500V; temperature: 450°C; detection method: data-dependent scan.
  • the method for making the standard curve is as follows: prepare a casein glycomacropeptide standard solution with a concentration of 0.1-50 mg/mL, take the casein glycomacropeptide concentration as the abscissa, and the peak area as the ordinate to make a standard curve.
  • Example 3 The difference between Example 3 and Example 1 is that a boron affinity column enrichment-liquid chromatography-tandem mass spectrometry method for detecting sialyl glycosylcasein glycomacropeptide of the present invention comprises the following steps:
  • Sample preparation Accurately weigh 6g of the fully homogenized sample into a beaker, add 20mL of deionized water to dissolve, stir magnetically, heat to 95°C to dissolve, cool to room temperature, adjust the pH to 4.8 with hydrochloric acid, and dilute to 56mL , transferred to a centrifuge tube, centrifuged, and 20 mL of the supernatant was taken as the sample solution.
  • a kind of phenylboronic acid-modified mesoporous silica of the present invention is the preparation of the boron-affinity silicon column of filler:
  • Step1 mesoporous silica Dissolve 0.3g of cetyltrimethylammonium bromide in 245mL of water, add 0.9mL of NaOH (2.0mol/L) to it, heat up to 80°C, stir vigorously, and dissolve 6mL of Ethyl silicate was added dropwise to the solution, and the mixture was stirred for 4 hours to produce white flocs.
  • Step2 Amination of mesoporous silica: Weigh 0.4g of mesoporous silica, disperse it in 85mL of anhydrous toluene, add 0.5mL of aminopropyltriethoxysilane, heat and reflux under nitrogen protection for 24h, centrifuge, and use for precipitation Toluene and methanol were washed three times and then vacuum-dried to obtain aminated mesoporous silica;
  • Step3 Phenylboronic acid modification of aminated mesoporous silica: Weigh 0.2 g of aminated mesoporous silica and disperse it in 24 mL of dimethyl sulfoxide. Add 0.9 g of 4-carboxyphenylboronic acid, 0.15 g of N-hydroxysuccinimide, and 0.08 g of 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride to 8 mL of dimethylmethylene React in sulfone, stir at room temperature for 60 minutes, add to the above-mentioned aminated mesoporous silica dispersion, stir at room temperature for 10 hours, centrifuge, wash the precipitate three times with dimethyl sulfoxide, water and methanol, and dry in vacuum to obtain benzene Boric acid-modified mesoporous silica.
  • Step4 Boron affinity column preparation: put 40 mg of phenylboronic acid-modified mesoporous silica into a polyethylene solid-phase extraction tube, add a sieve plate, and compact to prepare a boron affinity column.

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Abstract

一种以苯硼酸修饰介孔二氧化硅为填料的硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法，属于食品分析检测领域。检测方法包括以下步骤：(1)样品制备；(2)硼亲和柱富集净化；(3)液相色谱-串联质谱检测。利用苯硼酸对酪蛋白糖巨肽中丝氨酸和苏氨酸残基上特殊糖基-唾液酸的亲和特性，通过改变pH调控带有唾液酸糖基的酪蛋白糖巨肽的吸附和洗脱，结合液相色谱串联质谱的高灵敏度和精确度，能对苯丙酮尿症特殊医学用途配方食品复杂基质中的带有唾液酸糖基的酪蛋白糖巨肽进行定性和定量分析。

Description

一种检测唾液酸糖基酪蛋白糖巨肽的方法 技术领域
本发明涉及食品分析检测技术领域，具体涉及一种苯丙酮尿症特殊医学用途配方食品中酪蛋白糖巨肽的检测方法，特别涉及一种硼亲和柱富集-液相色谱-串联质谱检测带有唾液酸糖基的酪蛋白糖巨肽的方法。
背景技术
苯丙酮尿症，简称PKU，患者由于体内苯丙氨酸羟化酶缺失或活性低下不能代谢通过饮食摄入的苯丙氨酸，因此需要终身服用低苯丙氨酸的整蛋白替代性特殊医学用途配方食品满足日常营养所需。酪蛋白糖巨肽(Casein glycomacropeptide，CGMP)是κ-酪蛋白经凝乳酶酶解生成的氨基酸序列106-169位的多肽，不含苯丙氨酸。此外，酪蛋白糖巨肽含有唾液酸、半乳糖、乙酰氨基半乳糖和磷酸等多种基团，其中唾液酸具有促进婴幼儿大脑发育、抗菌消炎等功效，对于PKU患者，尤其是婴幼儿PKU患者是理想的特殊医学用途配方食品。由于酪蛋白糖巨肽结构特殊、制备复杂、成本较高，为确定PKU特殊医学用途配方食品中多肽成分的真正组成和其中带有唾液酸糖基的酪蛋白糖巨肽的准确含量，有必要对PKU特殊医学用途配方食品中带有唾液酸糖基的酪蛋白糖巨肽进行定性、定量分析。
液相色谱串联质谱法分析多肽灵敏度高、准确度好，但是复杂的多肽样品直接检测时，共存多肽和蛋白会降低酪蛋白糖巨肽的离子化效率，从而降低其响应值。酪蛋白糖巨肽上具有多个糖基化位点，是典型的糖肽，而硼亲和柱上的苯硼酸基团对糖基上的顺式邻二醇结构具有特殊亲和作用，可以实现糖肽的富集净化。
中国发明专利“一种苯硼酸材料富集糖肽的方法”(CN201310357237.0)利用硼亲和柱富集糖肽。该方法所用的硼亲和柱填料是苯硼酸修饰硅球，其粒径为2-50米；适用的蛋白来源为组织、细胞、血清或尿液等生物样品中蛋白或者是转铁蛋白、胎球蛋白、辣根过氧化物酶、核糖核酸酶B；蛋白酶解用酶为胰蛋白酶、内肽酶、胃蛋白酶、糜蛋白酶；冲洗溶剂必须有乙腈或甲醇等有机溶剂，pH为中性；洗脱溶剂必须有乙腈或甲醇等有机溶剂。该方法以上几个关键分析条件并不适用于PKU特殊医学用途配方食品中酪蛋白糖巨肽的富集。此外，Qibin  Zhang等在Enrichment and Analysis of Nonenzymatically Glycated Peptides：Boronate Affinity Chromatography Coupled with Electron-Transfer Dissociation Mass Spectrometry(Journal of Proteome Research 2007，6，2323-2330)一文中采用硼亲和柱富集分离糖蛋白和糖肽。该方法所用的硼亲和柱填料是苯硼酸修饰的琼脂糖凝胶；硼亲和柱层析时采用了自动化的色谱系统以及梯度流动相；硼亲和柱层析后必须以C18固相萃取柱脱盐；适用样品为人血清中的糖蛋白和胰蛋白酶消化的糖肽；最后用交替电子转移离解(ETD)和碰撞诱导离解(CID)串联质谱分析糖肽；应用于糖尿病诊疗。该方法以上几个关键分析条件也不适用于PKU特殊医学用途配方食品中酪蛋白糖巨肽的富集和分析。
生物样品与食品样品在组成上有很大区别，例如食品中会添加油脂、维生素、稳定剂等成分，这些添加物的存在使食品样品的前处理过程和分析过程完全不同于生物样品。目前，尚未有适合于酪蛋白糖巨肽的亲和柱净化富集-液相色谱串联质谱检测方案。
因此，需要设计一种硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法，实现对苯丙酮尿症特殊医学用途配方食品中酪蛋白糖巨肽的检测。
发明内容
本发明的目的在于提供一种灵敏快速的硼亲和硅柱净化-液相色谱-串联质谱检测苯丙酮尿症特殊医学用途配方食品中唾液酸糖基酪蛋白糖巨肽的方法。
为了解决现有技术的问题，本发明提供了如下技术方案：本发明的一种硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法，包括如下步骤：以苯硼酸修饰介孔二氧化硅为硼亲和柱填料，利用苯硼酸对酪蛋白糖巨肽中丝氨酸和苏氨酸残基上特殊糖基-唾液酸的亲和特性，通过改变pH调控带有唾液酸糖基的酪蛋白糖巨肽的吸附和洗脱，再以液相色谱-串联质谱分析，实现对苯丙酮尿症特殊医学用途配方食品中酪蛋白糖巨肽的检测；步骤如下：(1)样品制备；(2)硼亲和柱富集净化；(3)液相色谱-串联质谱分析。
进一步地，在步骤(1)中，样品制备：准确称取已充分均质样品5-10g于烧杯中，加入20-30mL去离子水溶解，磁力搅拌、加热至90℃溶解，冷却至室温后用盐酸调节pH至4.5-5.0，定容到50mL，转移到离心管中，离心，取20mL上清液为样品液；
在步骤(2)中，硼亲和柱富集净化：
所述的硼亲和柱的制备方法：Step1介孔二氧化硅的合成；Step2介孔二氧化硅的氨基化；Step3氨基化介孔二氧化硅的苯硼酸修饰；Step4硼亲和柱制备；
硼亲和柱上样品液，上样结束后，用pH为4.5-5.0的盐酸水溶液淋洗，抽干柱内残留液，并弃去以上全部流出液，最后用2mLpH值约为1.0的盐酸水溶液洗脱，洗脱液冻干，再用1mL液相色谱流动相重新溶解、定容，得到净化液；
在步骤(3)中，液相色谱-串联质谱分析：净化液经滤膜过滤后供液相色谱-串联质谱仪检测，获得酪蛋白糖巨肽的离子流色谱图和质谱图，将离子流色谱图的峰面积带入标准曲线分析计算，并结合质谱图进行结构鉴定，从而获得样品中酪蛋白糖巨肽的含量和结构信息。
进一步地，在步骤(2)中，Step1介孔二氧化硅的合成：0.25-0.3g十六烷基三甲基溴化铵溶于240-250mL水中，向其中加入0.8-1.0mL NaOH(2.0mol/L)，升温至80℃，剧烈搅拌，将5-7mL正硅酸乙酯滴加入溶液中，混合物继续搅拌反应2-5h，产生白色絮状物。离心弃去上清液，保留沉淀，用水和甲醇分别洗涤三次，60℃真空干燥，之后将0.4-0.5g上述沉淀分散于150-160mL含有1.5-2.0mL浓盐酸的甲醇溶液中，回流5-8h之后离心，沉淀60℃真空干燥，得到介孔二氧化硅。
进一步地，在步骤(2)中，Step2介孔二氧化硅的氨基化：称取0.3-0.4g介孔二氧化硅，分散于80-90mL无水甲苯中，加入0.5-2mL氨丙基三乙氧基硅烷，氮气保护加热回流20-24h，离心，沉淀用甲苯和甲醇分别洗涤三次后真空干燥，得到氨基化的介孔二氧化硅。
进一步地，在步骤(2)中，Step3氨基化介孔二氧化硅的苯硼酸修饰：称取0.2-0.3g氨基化介孔二氧化硅分散于20-25mL二甲亚砜中，将0.8-1.0g的4-羧基苯硼酸、0.1-0.2g N-羟基琥珀酰亚胺、0.05-0.1g 1-乙基-(3-二甲基氨基丙基)碳二亚胺盐酸盐依次加入5-10mL二甲亚砜中反应，在室温下搅拌30-60min后加入到上述氨基化介孔二氧化硅分散液中，室温下搅拌10-24h，离心，沉淀用二甲亚砜、水、甲醇分别洗涤三次，真空干燥，得到苯硼酸修饰的介孔二氧化硅；
进一步地，在步骤(2)中，Step4硼亲和柱制备：将20mg苯硼酸修饰的介孔二氧化硅装到聚乙烯固相萃取管中，加上筛板，压实，制得硼亲和柱。
进一步地，在步骤(3)中，用于重新溶解多肽的流动相配比为：含0.1％甲酸的乙腈水溶液所述的水和乙腈的体积比为90∶10。
进一步地，在步骤(3)中，色谱条件为：色谱柱：Agilent AdvanceBio PeptideMapping柱；柱温：40℃；进样体积：10μL；流速0.3mL/min；流动相A为含有0.1％甲酸的乙腈水溶液，所述的水和乙腈的体积为90∶10；流动相B为含有0.1％甲酸的乙腈溶液，梯度洗脱：0-5min，98％A；5-55min，98％-50％A；55-60min，50％-10％A；60-75min，10％A。
进一步地，在步骤(3)中，质谱条件为：电喷雾离子源；正离子扫描；喷雾电压：5500V；温度：450℃；检测方式：数据依赖型扫描。
进一步地，在步骤(3)中，标准曲线的制作方法为：配制浓度为0.1-50μg/mL的酪蛋白糖巨肽标准溶液，以酪蛋白糖巨肽浓度为横坐标，峰面积为纵坐标，制作标准曲线。
本发明所述的硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法在苯丙酮尿症特殊医学用途配方食品检测中的应用。
有益效果：本发明以苯硼酸修饰介孔二氧化硅为硼亲和柱填料其制备过程简单，利用苯硼酸对酪蛋白糖巨肽中丝氨酸和苏氨酸残基上特殊糖基-唾液酸在特定pH下的亲和特性实现高选择性吸附和高回收率洗脱，液相色谱-串联质谱分析洗脱液中的酪蛋白糖巨肽，灵敏、高效地实现对苯丙酮尿症特殊医学用途配方食品中酪蛋白糖巨肽的检测。解决目前报道的酪蛋白糖巨肽分离选择特异性不强、杂质多和检测粗放的问题，提供一种选择特异性良好的提取分离酪蛋白糖巨肽的方法，并进行精细结构分析的一种方法。同时，为目前国内酪蛋白糖巨肽标准化检测提供新思路。
附图说明
图1为本发明的操作流程示意图。
图2为实施例1所合成的苯硼酸修饰的介孔二氧化硅的透射电子显微镜图。
图3为实施例1所合成的苯硼酸修饰的介孔二氧化硅的元素分析图。
图4为实施例2中富集前后的MALDI-TOF质谱图。
具体实施方式
以下实施例是对本发明的进一步说明，而不是限制本发明的范围。
实施例1
本发明的一种硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法，包括如下步骤：以苯硼酸修饰介孔二氧化硅为硼亲和柱填料，利用苯硼酸对酪蛋白糖巨肽中丝氨酸和苏氨酸残基上特殊糖基-唾液酸的亲和特性，通过改变pH调控带有唾液酸糖基的酪蛋白糖巨肽的吸附和洗脱，再以液相色谱-串联质谱分析，实现对苯丙酮尿症特殊医学用途配方食品中酪蛋白糖巨肽的检测；步骤如下：(1)样品制备；(2)硼亲和柱富集净化；(3)液相色谱-串联质谱分析。
(1)样品制备：准确称取已充分均质样品5g于烧杯中，加入30mL去离子水溶解，磁力搅拌、加热至100℃溶解，冷却至室温后用盐酸调节pH至5.0，定容到60mL，转移到离心管中，离心，取20mL上清液为样品液。
(2)硼亲和柱富集净化：硼亲和柱上样品液，上样结束后，用pH为5.0的盐酸水溶液淋洗，抽干柱内残留液，并弃去以上全部流出液，最后用1mL pH值约为1.0的盐酸水溶液洗脱，洗脱液冻干，再用1mL液相色谱流动相(含0.1％甲酸的乙腈水溶液(水∶乙腈v∶v＝90∶10))重新溶解、定容，得到净化液。
在步骤(2)中，本发明的一种苯硼酸修饰的介孔二氧化硅为填料的硼亲和硅柱的制备：
Step1介孔二氧化硅的合成：0.28g十六烷基三甲基溴化铵溶于240mL水中，向其中加入0.8mLNaOH(2.0mol/L)，升温至80℃，剧烈搅拌，将5mL正硅酸乙酯滴加入溶液中，混合物继续搅拌反应5h，产生白色絮状物。离心去除上清液，保留沉淀，用水和甲醇分别洗涤三次，60℃真空干燥，之后将0.5g上述沉淀分散于150mL含有1.5mL浓盐酸的甲醇溶液中，回流5h之后离心，沉淀60℃真空干燥，得到介孔二氧化硅。
Step2介孔二氧化硅的氨基化：称取0.3g介孔二氧化硅，分散于90mL无水甲苯中，加入2mL氨丙基三乙氧基硅烷，氮气保护加热回流23h，离心，沉淀用甲苯和甲醇分别洗涤三次后真空干燥，得到氨基化的介孔二氧化硅；
Step3氨基化介孔二氧化硅的苯硼酸修饰：称取0.3g氨基化介孔二氧化硅分散于20mL二甲亚砜中。将1.0g的4-羧基苯硼酸、0.1g N-羟基琥珀酰亚胺、0.09g 1-乙基-(3-二甲基氨基丙基)碳二亚胺盐酸盐依次加入10mL二甲亚砜中反应，在室温下搅拌50min后加入到上述氨基化介孔二氧化硅分散液中，室温下搅拌24h，离心，沉淀用二甲亚砜、水、甲醇分别洗涤三次，真空干燥，得到苯硼酸修饰的介孔二氧化硅。
Step4硼亲和柱制备：将50mg苯硼酸修饰的介孔二氧化硅装到聚乙烯固相萃取管中，加上筛板，压实，制得硼亲和柱。
(3)液相色谱-串联质谱分析：配制浓度为0.1-50μg/mL的酪蛋白糖巨肽标准溶液，酪蛋白糖巨肽标准溶液和样品净化液分别经0.22微米微孔滤膜过滤；液相色谱分离，色谱条件为：色谱柱：Agilent AdvanceBio PeptideMapping柱；柱温：35-40℃；进样体积：5-10微升；流速0.1-0.3mL/min；流动相A为含有0.1％甲酸的乙腈水溶液(水∶乙腈v∶v＝90∶10)；流动相B为含有0.1％甲酸的乙腈溶液，梯度洗脱：0-5min，98％A；5-55min，98％-50％A；55-60min，50％-10％A；60-75min，10％A。串联质谱仪检测，质谱条件为：电喷雾离子源；正离 子扫描；喷雾电压：5500V；温度：400-450℃；检测方式：数据依赖型扫描。获得酪蛋白糖巨肽的离子流色谱图和质谱图。以酪蛋白糖巨肽浓度为横坐标，峰面积为纵坐标，制作标准曲线。将离子流色谱图的峰面积带入标准曲线分析计算，并结合质谱图进行结构鉴定，从而获得样品中带有唾液酸糖基的酪蛋白糖巨肽的含量和结构信息。
本发明所述的硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法在苯丙酮尿症特殊医学用途配方食品检测中的应用。
图1为本发明的操作流程示意图。图4为实施例2中富集前后的MALDI-TOF质谱图，酪蛋白糖巨肽为5000-7000Da范围内的多肽，可以看出富集前后质荷比4000Da以上的多肽含量明显增多，因此对苯硼酸修饰的介孔二氧化硅对酪蛋白糖巨肽有富集效果。
图2为实施例1所合成的苯硼酸修饰的介孔二氧化硅的透射电子显微镜图，由图(a)可看出，合成的介孔二氧化硅为直径约100nm的球状材料，分散性良好；由图(b)可看出二氧化硅微球表面有约2-3nm的介孔。
图3为实施例1所合成的苯硼酸修饰的介孔二氧化硅的扫描电子显微镜和元素谱图图，可以看到B、C、N、O、Si的元素分布和材料的分布一致，二氧化硅材料较多处，元素也相应增多，并最终计算出元素B的含量为9.23％。
实施例2
实施例2与实施例1的区别在于：本发明的一种硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法，包括如下步骤：
(1)样品制备：准确称取已充分均质样品10g于烧杯中，加入25mL去离子水溶解，磁力搅拌、加热至90℃溶解，冷却至室温后用盐酸调节pH至4.8，定容到50mL，转移到离心管中，离心，取20mL上清液为样品液。
(2)硼亲和柱富集净化：硼亲和柱上样品液，上样结束后，用pH为4.5的盐酸水溶液淋洗，抽干柱内残留液，并弃去以上全部流出液，最后用5mL pH值约为1.0的盐酸水溶液洗脱，洗脱液冻干，再用1mL液相色谱流动相(含0.1％甲酸的乙腈水溶液(水∶乙腈v∶v＝90∶10))重新溶解、定容，得到净化液。
本发明的一种苯硼酸修饰的介孔二氧化硅为填料的硼亲和硅柱的制备：
Step1介孔二氧化硅的合成：0.25g十六烷基三甲基溴化铵溶于250mL水中，向其中加入1.0mL NaOH(2.0mol/L)，升温至80℃，剧烈搅拌，将7mL正硅酸乙酯滴加入溶液中，混合物继续搅拌反应2h，产生白色絮状物。离心去除上清液，保留沉淀，用水和甲醇分别洗 涤三次，60℃真空干燥，之后将0.4g上述沉淀分散于160mL含有2.0mL浓盐酸的甲醇溶液中，回流8h之后离心，沉淀60℃真空干燥，得到介孔二氧化硅。
Step2介孔二氧化硅的氨基化：称取0.35g介孔二氧化硅，分散于80mL无水甲苯中，加入1.5mL氨丙基三乙氧基硅烷，氮气保护加热回流20h，离心，沉淀用甲苯和甲醇分别洗涤三次后真空干燥，得到氨基化的介孔二氧化硅；
Step3氨基化介孔二氧化硅的苯硼酸修饰：称取0.25g氨基化介孔二氧化硅分散于25mL二甲亚砜中。将0.8g的4-羧基苯硼酸、0.2g N-羟基琥珀酰亚胺、0.05g 1-乙基-(3-二甲基氨基丙基)碳二亚胺盐酸盐依次加入5mL二甲亚砜中反应，在室温下搅拌30min后加入到上述氨基化介孔二氧化硅分散液中，室温下搅拌20h，离心，沉淀用二甲亚砜、水、甲醇分别洗涤三次，真空干燥，得到苯硼酸修饰的介孔二氧化硅。
Step4硼亲和柱制备：将20mg苯硼酸修饰的介孔二氧化硅装到聚乙烯固相萃取管中，加上筛板，压实，制得硼亲和柱。
(3)色谱条件为：色谱柱：Agilent AdvanceBio PeptideMapping柱；柱温：40℃；进样体积：10mL；流速0.3mL/min；流动相A为含有0.1％甲酸的乙腈水溶液，所述的水和乙腈的体积为90∶10；流动相B为含有0.1％甲酸的乙腈溶液，梯度洗脱：0-5min，98％A；5-55min，98％-50％A；55-60min，50％-10％A；60-75min，10％A。
质谱条件为：电喷雾离子源；正离子扫描；喷雾电压：5500V；温度：450℃；检测方式：数据依赖型扫描。标准曲线的制作方法为：配制浓度为0.1-50mg/mL的酪蛋白糖巨肽标准溶液，以酪蛋白糖巨肽浓度为横坐标，峰面积为纵坐标，制作标准曲线。
实施例3
实施例3与实施例1的区别在于：本发明的一种硼亲和柱富集-液相色谱-串联质谱检测唾液酸糖基酪蛋白糖巨肽的方法，包括如下步骤：
(1)样品制备：准确称取已充分均质样品6g于烧杯中，加入20mL去离子水溶解，磁力搅拌、加热至95℃溶解，冷却至室温后用盐酸调节pH至4.8，定容到56mL，转移到离心管中，离心，取20mL上清液为样品液。
(2)硼亲和柱富集净化：硼亲和柱上样品液，上样结束后，用pH为4.8的盐酸水溶液淋洗，抽干柱内残留液，并弃去以上全部流出液，最后用3mL pH值约为1.0的盐酸水溶液洗脱，洗脱液冻干，再用1mL液相色谱流动相(含0.1％甲酸的乙腈水溶液(水∶乙腈v∶v＝90∶10))重新溶解、定容，得到净化液。
在步骤(2)中，本发明的一种苯硼酸修饰的介孔二氧化硅为填料的硼亲和硅柱的制备：
Step1介孔二氧化硅的合成：0.3g十六烷基三甲基溴化铵溶于245mL水中，向其中加入0.9mL NaOH(2.0mol/L)，升温至80℃，剧烈搅拌，将6mL正硅酸乙酯滴加入溶液中，混合物继续搅拌反应4h，产生白色絮状物。离心去除上清液，保留沉淀，用水和甲醇分别洗涤三次，60℃真空干燥，之后将0.45g上述沉淀分散于155mL含有1.55mL浓盐酸的甲醇溶液中，回流7h之后离心，沉淀60℃真空干燥，得到介孔二氧化硅。
Step2介孔二氧化硅的氨基化：称取0.4g介孔二氧化硅，分散于85mL无水甲苯中，加入0.5mL氨丙基三乙氧基硅烷，氮气保护加热回流24h，离心，沉淀用甲苯和甲醇分别洗涤三次后真空干燥，得到氨基化的介孔二氧化硅；
Step3氨基化介孔二氧化硅的苯硼酸修饰：称取0.2g氨基化介孔二氧化硅分散于24mL二甲亚砜中。将0.9g的4-羧基苯硼酸、0.15g N-羟基琥珀酰亚胺、0.08g 1-乙基-(3-二甲基氨基丙基)碳二亚胺盐酸盐依次加入8mL二甲亚砜中反应，在室温下搅拌60min后加入到上述氨基化介孔二氧化硅分散液中，室温下搅拌10h，离心，沉淀用二甲亚砜、水、甲醇分别洗涤三次，真空干燥，得到苯硼酸修饰的介孔二氧化硅。
Step4硼亲和柱制备：将40mg苯硼酸修饰的介孔二氧化硅装到聚乙烯固相萃取管中，加上筛板，压实，制得硼亲和柱。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。

Claims (5)

  1. 一种检测唾液酸糖基酪蛋白糖巨肽的方法，其特征在于包括如下步骤：以苯硼酸修饰介孔二氧化硅为硼亲和柱填料，利用苯硼酸对酪蛋白糖巨肽中丝氨酸和苏氨酸残基上特殊糖基-唾液酸的亲和特性，通过改变pH调控带有唾液酸糖基的酪蛋白糖巨肽的吸附和洗脱，再以液相色谱-串联质谱分析，实现对苯丙酮尿症特殊医学用途配方食品中酪蛋白糖巨肽的检测；步骤如下：(1)样品制备：准确称取已充分均质样品5-10g于烧杯中，加入20-30mL去离子水溶解，磁力搅拌、加热至90℃溶解，冷却至室温后用盐酸调节pH至4.5-5.0，定容到50mL，转移到离心管中，离心，取20mL上清液为样品液；
    (2)硼亲和柱富集净化；Step1介孔二氧化硅的合成：0.25-0.3g十六烷基三甲基溴化铵溶于240-250mL水中，向其中加入2.0mol/L的0.8-1.0mL NaOH，升温至80℃，剧烈搅拌，将5-7mL正硅酸乙酯滴加入溶液中，混合物继续搅拌反应2-5h，产生白色絮状物；离心弃去上清液，保留沉淀，用水和甲醇分别洗涤三次，60℃真空干燥，之后将0.4-0.5g上述沉淀分散于150-160mL含有1.5-2.0mL浓盐酸的甲醇溶液中，回流5-8h之后离心，沉淀60℃真空干燥，得到介孔二氧化硅；
    Step2介孔二氧化硅的氨基化：称取0.3-0.4g介孔二氧化硅，分散于80-90mL无水甲苯中，加入0.5-2mL氨丙基三乙氧基硅烷，氮气保护加热回流20-24h，离心，沉淀用甲苯和甲醇分别洗涤三次后真空干燥，得到氨基化的介孔二氧化硅；
    Step3氨基化介孔二氧化硅的苯硼酸修饰：称取0.2-0.3g氨基化介孔二氧化硅分散于20-25mL二甲亚砜中，将0.8-1.0g的4-羧基苯硼酸、0.1-0.2g N-羟基琥珀酰亚胺、0.05-0.1g1-乙基-(3-二甲基氨基丙基)碳二亚胺盐酸盐依次加入5-10mL二甲亚砜中反应，在室温下搅拌30-60min后加入到上述氨基化介孔二氧化硅分散液中，室温下搅拌10-24h，离心，沉淀用二甲亚砜、水、甲醇分别洗涤三次，真空干燥，得到苯硼酸修饰的介孔二氧化硅；
    Step4硼亲和柱上样品液，上样结束后，用pH为4.5-5.0的盐酸水溶液淋洗，抽干柱内残留液，并弃去以上全部流出液，最后用2mL pH值为1.0的盐酸水溶液洗脱，洗脱液冻干，再用1mL液相色谱流动相重新溶解、定容，得到净化液，以上淋洗和洗脱液的pH值仅适用于唾液酸糖基酪蛋白糖巨肽的淋洗和洗脱，不适用于其他糖基化修饰的酪蛋白糖巨肽；
    硼亲和柱制备：将20mg苯硼酸修饰的介孔二氧化硅装到聚乙烯固相萃取管中，加上筛板，压实，制得硼亲和柱；
    (3)液相色谱-串联质谱分析：净化液经滤膜过滤后供液相色谱-串联质谱仪检测，获得 酪蛋白糖巨肽的离子流色谱图和质谱图，将离子流色谱图的峰面积带入标准曲线分析计算，并结合质谱图进行结构鉴定，从而获得样品中带有唾液酸糖基的酪蛋白糖巨肽的含量和结构信息。
  2. 根据权利要求1所述的检测唾液酸糖基酪蛋白糖巨肽的方法，其特征在于：在步骤(3)中，用于重新溶解多肽的流动相配比为：含0.1％甲酸的乙腈水溶液所述的水和乙腈的体积比为90:10。
  3. 根据权利要求1所述的检测唾液酸糖基酪蛋白糖巨肽的方法，其特征在于：在步骤(3)中，色谱条件为：色谱柱：Agilent AdvanceBio PeptideMapping柱；柱温：40℃；进样体积：10μL；流速0.3mL/min；流动相A为含有0.1％甲酸的乙腈水溶液，所述的水和乙腈的体积为90:10；流动相B为含有0.1％甲酸的乙腈溶液，梯度洗脱：0-5min，98％A；5-55min，98％-50％A；55-60min，50％-10％A；60-75min，10％A。
  4. 根据权利要求1所述的检测唾液酸糖基酪蛋白糖巨肽的方法，其特征在于：在步骤(3)中，质谱条件为：电喷雾离子源；正离子扫描；喷雾电压：5500V；温度：450℃；检测方式：数据依赖型扫描。
  5. 根据权利要求1所述的检测唾液酸糖基酪蛋白糖巨肽的方法，其特征在于：在步骤(3)中，标准曲线的制作方法为：配制浓度为0.1-50μg/mL的酪蛋白糖巨肽标准溶液，以酪蛋白糖巨肽浓度为横坐标，峰面积为纵坐标，制作标准曲线。
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