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Hu W, Xiong Z, Meng X, Wu Y, Tong P, Gao J, Li X, Chen H. Lipid matrix-specific pretreatment method for enhancing the extractability and allergenicity maintenance of bovine milk allergens in ELISA detection. Food Chem 2024; 452:139462. [PMID: 38723563 DOI: 10.1016/j.foodchem.2024.139462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 04/21/2024] [Accepted: 04/21/2024] [Indexed: 06/01/2024]
Abstract
The presence of various components in the food matrix makes allergen detection difficult and inaccurate, and pretreatment is an innovative breakthrough point. Food matrices were categorised based on their composition. Subsequently, a pretreatment method was established using a combination of ultrasound-assisted n-hexane degreasing and weakly alkaline extraction systems to enhance the detection accuracy of bovine milk allergens. Results showed that more allergens were obtained with less structural destruction, as demonstrated using immunological quantification and spectral analysis. Concurrently, allergenicity preservation was confirmed through liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis, a KU812 cell degranulation model, and western blotting. The method exhibited good accuracy (bias, 8.47%), repeatability (RSDr, 1.52%), and stability (RSDR, 5.65%). In foods with high lipid content, such as chocolate, the allergen content was 2.29-fold higher than that of commercial kits. Laser confocal scanning microscopy (LCSM) and scanning electron microscopy (SEM) analyses revealed a significant decrease in fat content after post-pretreatment using our method. In addition, colloidal stability surpassed that achieved using commercial kits, as indicated through the PSA and zeta potential results. The results demonstrated the superiority of the extractability and allergenicity maintenance of lipid matrix-specific pretreatment methods for improving the accuracy of ELISA based allergen detection in real food.
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Affiliation(s)
- Wei Hu
- State Key Laboratory of Food Science and Resource, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330031, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China
| | - Ziyi Xiong
- State Key Laboratory of Food Science and Resource, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330031, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China
| | - Xuanyi Meng
- State Key Laboratory of Food Science and Resource, Nanchang University, Nanchang 330047, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China; Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
| | - Yong Wu
- State Key Laboratory of Food Science and Resource, Nanchang University, Nanchang 330047, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China; Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
| | - Ping Tong
- State Key Laboratory of Food Science and Resource, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330031, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China
| | - Jinyan Gao
- School of Food Science and Technology, Nanchang University, Nanchang 330031, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China
| | - Xin Li
- State Key Laboratory of Food Science and Resource, Nanchang University, Nanchang 330047, China; School of Food Science and Technology, Nanchang University, Nanchang 330031, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China.
| | - Hongbing Chen
- State Key Laboratory of Food Science and Resource, Nanchang University, Nanchang 330047, China; Jiangxi Province Key Laboratory of Food Allergy, Nanchang 330047, China; Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
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Shui T, Fu Y, Duan Y, Sun F, Yang H, Huang P, Xi J. Localization of G1A1a Allergenic Domain Destroyed by Thermal Processing. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:9947-9954. [PMID: 38647139 DOI: 10.1021/acs.jafc.3c09912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Glycinin is an important allergenic protein. A1a is the acidic chain of the G1 subunit in glycinin (G1A1a), and it has strong allergenicity. In this study, we used phage display technology to express the protein of G1A1a and its overlapping fragments and an indirect enzyme-linked immunosorbent assay (iELISA) to determine the antigenicity and allergenicity of the expressed protein. After three rounds of screening, it was determined that fragment A1a-2-B-I (151SLENQLDQMPRRFYLAGNQEQEFLKYQQEQG181) is the allergenic domain of G1A1a destroyed by thermal processing. In addition, three overlapping peptides were synthesized from fragments A1a-2-B-I, and a linear epitope was found in this domain through methods including dot blot and iELISA. Peptide 2 (157DQMPRRFYLANGNQE170) showed allergenicity, and after replacing it with alanine, it was found that amino acids D157, Q158, M159, and Y164 were the key amino acids that affected its antigenicity, while Q158, M159, R162, and N168 affected allergenicity.
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Affiliation(s)
- Tianjiao Shui
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Yang Fu
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Yuying Duan
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Fuyu Sun
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Huanhuan Yang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Pengbo Huang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Jun Xi
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
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Li Y, Gao Y, Wang Y, Duan Y, Fu Y, Yang H, Xi J. Localization of an IgE epitope of glycinin A2 peptide chain. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024; 104:3697-3704. [PMID: 38160247 DOI: 10.1002/jsfa.13254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 12/04/2023] [Accepted: 12/11/2023] [Indexed: 01/03/2024]
Abstract
INTRODUCTION One of the main allergens in soybeans is glycinin, which seriously impacts the normal lives of allergic people. Previous studies have confirmed that thermal processing and thermal processing combined with ultrahigh-pressure processing could significantly reduce the antigenicity of glycinin. The dominant antigen region of acidic peptide chain A2 of G2 subunit was located by phage display experiment. METHODS In this paper, overlapping peptides and alanine substitution techniques were used to explore the key amino acids that significantly affect the antigenicity of A2 peptide chain. The purity of peptide 1, peptide 2 and peptide 3 was identified by mass spectrometry and high-performance liquid chromatography, and the results showed that the purity of the synthesized overlapping peptide was more than 90%. SDS-PAGE showed that the peptide was successfully coupled with bovine serum albumin. The antigenicity of the coupling peptide was tested by ELISA and Dot-Blot, and the allergenicity was detected by reacting with the serum of patients with soybean globulin allergy. CONCLUSION The results showed that peptide 3 has stronger antigenicity and sensitization. Alanine substitution technology allowed one to perform site-directed mutagenesis on peptide 3. Dot-Blot and ELISA tests showed that D259, E260, E261, Q263 and C266 may be the key amino acids that significantly affect the antigenicity of peptide 3. The research presented is of great significance for correctly guiding the production of safe food and preventing the occurrence of food allergic diseases. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Yingying Li
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Yida Gao
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Yichao Wang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Yuying Duan
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Yang Fu
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Huanhuan Yang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Jun Xi
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
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Huang P, Yang S, Chen Z, Shang A, Liu D, Xi J. A SERS-based immune-nanoprobe for ultrasensitive detection of glycinin via a lateral flow assay. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 305:123439. [PMID: 37774588 DOI: 10.1016/j.saa.2023.123439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 09/13/2023] [Accepted: 09/18/2023] [Indexed: 10/01/2023]
Abstract
Glycinin is one of the most nutritious ingredients in soybean, but it is also an allergen that can cause allergic reactions in humans and animals, and even endanger life in severe cases. Therefore, it is imperative to develop a rapid and ultrasensitive detection method for glycinin. In order to achieve this goal, this experiment combined surface-enhanced Raman spectroscopy (SERS) technology with an economical, simple, fast and easy-to-carry immunochromatographic test strip, and successfully constructed an efficient sandwich immunochromatographic test strip. The immunoprobe of the test strip was covalently coupled by gold nanostars (AuNSs), Raman molecule 4-aminothiophenol (4-PATP) and rabbit polyclonal antibody. In this experiment, a gold nanostar immunochromatographic test strip for detecting glycinin was established. The detection limit of the test strip was 0.23 ng / mL, the recovery rate was 91.5-96.6 %, and the coefficient of variation was 1.61-6.15 %. In addition, the test strip had no cross reaction with whey protein, wheat protein, peanut protein, sesame protein and β-conglycinin, indicating that the detection method had good specificity and the ability to avoid false positive results. Hence, this experiment successfully prepared a rapid and sensitive test strip for glycinin.
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Affiliation(s)
- Pengbo Huang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Shuo Yang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Zixin Chen
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Achen Shang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Deguo Liu
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Jun Xi
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China.
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Xi J, Li Y, Cheng H, Wang Y. Identification of allergenic epitopes destroyed by two processing technologies of glycinin A2 from soybean. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023; 103:2700-2708. [PMID: 36335553 DOI: 10.1002/jsfa.12320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 09/25/2022] [Accepted: 11/06/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Glycinin is one of the most highly allergenic proteins in soybeans, and G2 is one of the five allergenic subunits of glycinin. Compared with the alkaline chain, the acidic chain A2 of the G2 subunit has strong allergenicity. However, the precise epitopes of A2 and the epitopes destroyed during processing are still unknown. RESULTS In the present study, preparation of two specific antibodies damaged by processing and phage display techniques were applied to locate the antigenic epitopes of glycinin A2 polypeptide chains disrupted by two processing techniques (thermal processing and ultra-high pressure combined thermal processing). Bioinformatics methods were used to predict the possible epitopes of the A2 chain. The A2 chain and its overlapping segments were introduced into T7 phages and expressed on phage shell by phage display. An indirect enzyme-linked immunosorbent assay was used to screen for antigenic epitopes that had been disrupted by the two processing technologies. The results showed that the dominant antigenic region disrupted by processing was located mainly in the A2-3-B fragment. The reacting experiment with the serum of allergic patients showed that the A2-3-B fragment protein was not only an antigenic region, but also an allergenic region. The two processing technologies destroyed the allergenic epitopes of A2 chain, thereby reducing the allergenicity of protein. The amino acids where the dominant allergenic region disrupted by processing was located were: 233 AIVTVKGGLRVTAPAMRKPQQEEDDDDEEEQPQCVE268 . CONCLUSION Precise epitopes of the acidic chain A2 in glycinin were identified and epitopes destroyed in two common processing methods were also obtained. The application products of rapid detection of de-allergenicity effect of processed food can be developed according to the location of processed destruction allergenic region, which is of great significance with respect to preventing the occurrence of soybean allergenic diseases. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Jun Xi
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Yingying Li
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Huibin Cheng
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
| | - Yichao Wang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, China
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β-Lactoglobulin versus casein indirect ELISA for the detection of cow's milk allergens in raw and processed model meat products. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.108818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Xi J, Li Y. The effects of ultra‐high‐pressure treatments combined with heat treatments on the antigenicity and structure of soy glycinin. Int J Food Sci Technol 2021. [DOI: 10.1111/ijfs.15297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jun Xi
- College of Food Science and Technology Henan University of Technology Zhengzhou 450001 China
| | - Yingying Li
- College of Food Science and Technology Henan University of Technology Zhengzhou 450001 China
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