1
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Han X, Lin H, Chen X, Wang L, Zhang Z, Wei X, Sun X, Xie H, Pavase TR, Cao L, Sui J. Amide-containing neoepitopes: the key factor in the preparation of hapten-specific antibodies and a strategy to overcome. Front Immunol 2023; 14:1144020. [PMID: 37342337 PMCID: PMC10277511 DOI: 10.3389/fimmu.2023.1144020] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 05/15/2023] [Indexed: 06/22/2023] Open
Abstract
For a long time, people have suffered from uncertainty, complexity, and a low success rate in generating and screening antibodies against small molecules, which have become the core bottlenecks of immunochemistry. Here, the influence of antigen preparation on antibody generation was investigated at both molecular and submolecular levels. Neoepitopes (amide-containing neoepitopes) formed in the preparation of complete antigens are one of the most important factors limiting the efficiency of generating hapten-specific antibodies, which was verified by different haptens, carrier proteins, and conjugation conditions. Amide-containing neoepitopes present electron-dense structural components on the surface of prepared complete antigens and, therefore, induce the generation of the corresponding antibody with much higher efficiency than target hapten. Crosslinkers should be carefully selected and not overdosed. According to these results, some misconceptions in the conventional anti-hapten antibody production were clarified and corrected. By controlling the content of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) during the synthesis of immunogen to limit the formation of amide-containing neoepitopes, the efficiency of hapten-specific antibody generation could be significantly improved, which verified the correctness of the conclusion and provided an efficient strategy for antibody preparation. The result of the work is of scientific significance in the preparation of high-quality antibodies against small molecules.
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Affiliation(s)
- Xiangning Han
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Hong Lin
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Xiangfeng Chen
- Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Luefeng Wang
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Ziang Zhang
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Xiaojing Wei
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Xun Sun
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Hanyi Xie
- Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China
| | - Tushar Ramesh Pavase
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Limin Cao
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
| | - Jianxin Sui
- College of Food Science and Engineering, Ocean University of China, Qingdao, China
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2
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Pan K, Liu Z, Li Z, Chen M, Quan Q, Yu X, Lei Y, Mo Q, Wang B, Guan T, Lei H. Identifying fungicide difenoconazole as illegal growth regulator in vegetable: Computer-aided hapten similarity to enhance immunoassay sensitivity. Anal Chim Acta 2023; 1258:341182. [PMID: 37087291 DOI: 10.1016/j.aca.2023.341182] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/24/2023] [Accepted: 04/05/2023] [Indexed: 04/24/2023]
Abstract
Difenoconazole, a fungicide with broad-spectrum properties, has recently been found to have been used illegally used as a plant growth regulator in Brassica campestris, with the intent of inducing thick stems and dark green leaves. However, analysts have encountered challenges in implementing a rapid surveillance screening approach for this purpose. In this study, a novel hapten was designed to improve the analytical performance of difenoconazole immunoassay. Specifically, the triazole of the original hapten was replaced with a benzene ring, guided by molecular simulation. This led to the development of a very sensitive antibody and the subsequent development of a competitive indirect enzyme linked immunosorbent assay (ciELISA) for the detection of difenoconazole in vegetable samples. The assay exhibited a working range of 0.16 ng mL-1 to 9.64 ng mL-1, with a detection limit of 0.05 ng mL-1. Upon analysis of blind samples, a strong correlation was observed between the ciELISA and HPLC-MS/MS methods. As a result, the proposed technique may prove to be an excellent tool for the rapid detection of difenoconazole overuse and adulteration in vegetables.
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Affiliation(s)
- Kangliang Pan
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Zhiwei Liu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou, 510642, China
| | - Zhaodong Li
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou, 510642, China
| | - Mindan Chen
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou, 510642, China
| | - Qiqi Quan
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou, 510642, China
| | - Xiaoqin Yu
- Sichuan Institute of Food Inspection, Key Laboratory of Baijiu Supervising Technology for State Market Regulation, Sichuan, Chengdu, 610000, China
| | - Yi Lei
- Guangdong Institute of Food Inspection, Zengcha Road, Guangzhou, 510435, China
| | - Qiuhua Mo
- Bioeasy Technology, Inc., Shenzhen, 518102, China
| | - Bingzhi Wang
- Bioeasy Technology, Inc., Shenzhen, 518102, China
| | - Tian Guan
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou, 510642, China.
| | - Hongtao Lei
- Guangdong Provincial Key Laboratory of Food Quality and Safety, Nation-Local Joint Engineering Research Center for Machining and Safety of Livestock and Poultry Products, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China; Licheng Detection and Certification Group Co., Ltd, Guangdong, Zhongshan, 528403, China.
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3
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Liu X, Xie B, Cheng Y, Luo L, Liang Y, Xiao Z. A Sensitive Monoclonal-Antibody-Based ELISA for Forchlorfenuron Residue Analysis in Food Samples. BIOSENSORS 2022; 12:bios12020078. [PMID: 35200339 PMCID: PMC8869720 DOI: 10.3390/bios12020078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 01/23/2022] [Accepted: 01/24/2022] [Indexed: 11/16/2022]
Abstract
In this study, forchlorfenuron (CPPU) was coupled with succinic anhydride to yield a CPPU hapten (CPPU-COOH), and a high-affinity monoclonal antibody (mAb) that can specifically recognize CPPU was produced. Using this mAb as a recognition reagent, a sensitive indirect competitive enzyme-linked immunosorbent assay (icELISA) for CPPU was optimized, which exhibits an IC50 of 1.04 ng/mL, a limit of detection of 0.16 ng/mL, and a linear range of 0.31–3.43 ng/mL for CPPU. Cross-reactivity percentages with six analogues were all below 6%. The average recovery rates for cucumber and orange samples were from 85.23% to 119.14%. The analysis results of this icELISA showed good consistency with those from liquid chromatography mass spectrometry. These results suggest that the proposed icELISA provides a sensitive, specific, and reliable strategy for CPPU detection in food samples.
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4
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Chen X, Du H, Hong Y, Wang Y, Shu M, Wang D, Dai P, Deng W, Xiong J, Yang W. Development of a single-chain variable fragment-alkaline phosphatase fusion protein-based direct competitive enzyme-linked immunosorbent assay for furaltadone metabolite in ctenopharyngodon idellus. FOOD AGR IMMUNOL 2021. [DOI: 10.1080/09540105.2021.1957781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
- Xinzhu Chen
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Huaying Du
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Yanping Hong
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Yubo Wang
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Mei Shu
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Dan Wang
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Peng Dai
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Weijie Deng
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Jianhua Xiong
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
| | - Wuying Yang
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang, People’s Republic of China
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5
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Zhao Y, Wang M, Zhang M, Yang X, Li Z, Vasylieva N, Tan G, Wang B, Hammock BD. Development of a direct competitive enzyme-linked immunosorbent assay for quantitation of sodium saccharin residue in food. J Food Sci 2021; 86:3720-3729. [PMID: 34309034 DOI: 10.1111/1750-3841.15767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 04/08/2021] [Accepted: 04/14/2021] [Indexed: 11/29/2022]
Abstract
Sodium saccharin is a common artificial sweetener. However, due to its possible carcinogenic effects and causing metabolic disorders, many countries have strictly regulated its use in food. In the study, we prepared a specific monoclonal antibody (mAb 2H11) using the new hapten (6-carboxylsaccharin) and developed a direct competitive enzyme-linked immunosorbent assay (dcELISA) for the screening of sodium saccharin residue in food. The half-maximum inhibition concentration (IC50 ) and working range (IC20 -IC80 , the concentrations causing 20% and 80% inhibition by sodium saccharin) were 32.5 and 6.47 to 164 ng/mL, which was 6.5 times more sensitive than the previously reported immunoassay. The average recoveries of sodium saccharin in spiked food samples detected by dcELISA ranged from 82.1% to 117%. Among 70 food samples bought in the physical stores and online, sodium saccharin residues were only detected in four samples purchased online (one canned pineapple, two winter jujube, and one kimchi). The content measured by dcELISA agreed well with those determined by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). The developed dcELISA was proved to be a sensitive and accurate method for determining sodium saccharin in food. PRACTICAL APPLICATION: Quantitation of sodium saccharin residue in food is very necessary and important for consumers and regulatory agencies.
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Affiliation(s)
- Yajie Zhao
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China.,Department of Entomology and UCD Comprehensive Cancer Center, University of California, Davis, California, USA
| | - Mian Wang
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China
| | - Man Zhang
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China
| | - Xiaolin Yang
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China
| | - ZhenFeng Li
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China
| | - Natalia Vasylieva
- Department of Entomology and UCD Comprehensive Cancer Center, University of California, Davis, California, USA
| | - Guiyu Tan
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China
| | - Baomin Wang
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China
| | - Bruce D Hammock
- Department of Entomology and UCD Comprehensive Cancer Center, University of California, Davis, California, USA
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6
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Zhang L, Sun J, Zhou X, Nirere A, Wu X, Dai R. Classification detection of saccharin jujube based on hyperspectral imaging technology. J FOOD PROCESS PRES 2020. [DOI: 10.1111/jfpp.14591] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lin Zhang
- School of Electrical and Information EngineeringJiangsu University Zhenjiang China
| | - Jun Sun
- School of Electrical and Information EngineeringJiangsu University Zhenjiang China
| | - Xin Zhou
- School of Electrical and Information EngineeringJiangsu University Zhenjiang China
| | - Adria Nirere
- School of Electrical and Information EngineeringJiangsu University Zhenjiang China
| | - Xiaohong Wu
- School of Electrical and Information EngineeringJiangsu University Zhenjiang China
| | - Ruimin Dai
- School of Electrical and Information EngineeringJiangsu University Zhenjiang China
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7
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Yuan N, Zhang Y, Xu H, Zhou Z, Lu X, Chen T, Yang Q, Tan J, Zhang W. Development of the Saltatory Rolling Circle Amplification Assay for Rapid and Visual Detection of Alicyclobacillus acidoterrestris in Apple Juice. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:4538-4545. [PMID: 32208687 DOI: 10.1021/acs.jafc.0c00061] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A novel nucleic acid isothermal amplification method based on saltatory rolling circle amplification (SRCA) for rapid and visual detection of Alicyclobacillus acidoterrestris in apple juice was established. Fourteen A. acidoterrestris strains and 44 non-A. acidoterrestris strains were used to confirm the specificity. The sensitivity of SRCA was 4.5 × 101 CFU/mL by observing the white precipitate with the naked eye, while it was 4.5 × 100 CFU/mL by fluorescence visualization. The detection limit of SRCA in artificially inoculated apple juice was 7.1 × 101 and 7.1 × 100 CFU/mL via visualization of the white precipitate and fluorescence, respectively. Compared with the traditional PCR method, SRCA exhibited at least a 100-fold higher sensitivity and 100-fold lower detection limit. Seventy samples were investigated for A. acidoterrestris contamination, and the results showed 100% sensitivity, 97.01% specificity, and 97.14% accuracy compared with those by the conventional microbiological cultivation method. Overall, this method is a potentially useful tool for visual and rapid detection of A. acidoterrestris.
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Affiliation(s)
- Ning Yuan
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, Hebei, China
| | - Yunzhe Zhang
- College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, Hebei, China
| | - Hui Xu
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, Hebei, China
| | - Zhijun Zhou
- Teaching experiment center, Hebei Agricultural University, Baoding 071001, Hebei, China
| | - Xin Lu
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, Hebei, China
| | - Tingting Chen
- College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, Hebei, China
| | - Qian Yang
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, Hebei, China
| | - Jianxin Tan
- College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, Hebei, China
| | - Wei Zhang
- College of Science and Technology, Hebei Agricultural University, Cangzhou 061100, Hebei, China
- College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, Hebei, China
- College of Life Sciences, Hebei Agricultural University, Baoding 071001, Hebei, China
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8
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Zhang S, Wu ZY, Zhou K, Luo L, Xu ZL. Development of a competitive indirect ELISA for high-throughput screening of hydrocortisone in cosmetic sample. FOOD AGR IMMUNOL 2019. [DOI: 10.1080/09540105.2019.1608162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Affiliation(s)
- Shiwei Zhang
- Shenzhen Academy of Metrology and Quality Inspection, National Nutrition Food Testing Center, Shenzhen, People’s Republic of China
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou, People’s Republic of China
| | - Zhuo-Yu Wu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou, People’s Republic of China
| | - Kai Zhou
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou, People’s Republic of China
| | - Lin Luo
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou, People’s Republic of China
| | - Zhen-Lin Xu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou, People’s Republic of China
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9
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Mansourian M, Mahnam K, Rajabi HR, Roushani M, Doustimotlagh AH. Exploring the binding mechanism of saccharin and sodium saccharin to promoter of human p53 gene by theoretical and experimental methods. J Biomol Struct Dyn 2019; 38:548-564. [PMID: 30856053 DOI: 10.1080/07391102.2019.1582438] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In the past few decades, extensive discussions have been on the impact of artificial sweeteners on the risk of cancer. The present study aimed to evaluate the interaction of saccharin (SA) and sodium saccharin (SSA) with the promoter of the human p53 gene. The binding ability was assessed using the spectroscopic technique, molecular docking and molecular dynamics (MD) simulation methods. Free energy of binding has been calculated using Molecular Mechanics/Poisson-Boltzmann Surface Area (MM/PBSA) method. Fluorescence spectra of mentioned gene with concentration profiles of SA and SSA were obtained in a physiological condition. A gradual increase without any significant spectral shift in the fluorescence intensity of around 350 nm was evident, indicating the presence of an interaction between both compounds and gene. The docking results showed that both compounds were susceptible to bind to 5'-DG56DG57-3' nucleotide sequence of gene. Furthermore, the MD simulation demonstrated that the binding positions for SA and SSA were 5'-A1T3T4-3' and 5'-G44T45-3' sequences of gene, respectively. The binding of these sweeteners to gene made significant conformational changes to the DNA structure. Hydrogen and hydrophobic interactions are the major forces in complexes stability. Through the groove binding mode, the non-interactive DNA-binding nature of SSA and SA has been demonstrated by the results of spectrofluorometric and molecular modeling. This study could provide valuable insight into the binding mechanism of SA and its salt with p53 gene promoter as macromolecule at the molecular level in atomistic details. This work can contribute to the possibility of the potential hazard of carcinogenicity of this sweetener and to design and apply new and safer artificial sweeteners. AbbreviationsSASaccharinSSASodium SaccharinPp53gpromoter of human p53 geneMDMolecular dynamicsRMSDRoot-mean-square deviationRMSFRoot-mean-square fluctuationRgRadius of GyrationSASASolvent-Accessible Surface AreaADIAcceptable daily intakeMM/PBSAMolecular Mechanics/Poisson-Boltzmann Surface AreaCommunicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Mahboubeh Mansourian
- Cellular and Molecular Research Center, Yasuj University of Medical Sciences, Yasuj, Iran.,Department of Pharmacology, Faculty of Medicine, Yasuj University of Medical Sciences, Yasuj, I.R. Iran
| | - Karim Mahnam
- Faculty of Science, Department of Biology, Shahrekord University, Shahrekord, Iran.,Nanotechnology Research Center, Shahrekord University, Shahrekord, Iran
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10
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Wibowotomo B, Eun JB, Rhee JI. Development of a Sequential Injection Analysis System for the Determination of Saccharin. SENSORS 2017; 17:s17122891. [PMID: 29231885 PMCID: PMC5751712 DOI: 10.3390/s17122891] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Revised: 12/11/2017] [Accepted: 12/11/2017] [Indexed: 11/16/2022]
Abstract
Saccharin is a powerfully sweet nonnutritive sweetener that has been approved for food-processing applications within the range of 100-1200 mg/kg. A simple, rapid, and cost-effective sequential injection analysis (SIA) technique was developed to determine the saccharin level. This method is based on the reaction of saccharin with p-chloranil in an ethanol medium with a hydrogen peroxide (H₂O₂) acceleration, and the resultant violet-red compound was detected using a UV-Vis spectrophotometer at λmax = 420 nm. To ascertain the optimal conditions for the SIA system, several parameters were investigated, including buffer flow rate and volume, p-chloranil concentration, and reactant volumes (saccharin, p-chloranil, and H₂O₂). The optimum setup of the SIA system was achieved with a buffer flow rate, buffer volume, and draw-up time of 1.2 mL/min, 2900 µL, and ~145 s, respectively. The optimal p-chloranil concentration is 30 mM, and the best reactant volumes, presented in an ordered sequence, are as follows: 30 µL of H₂O₂, 450 µL of saccharin, and 150 µL of p-chloranil. The optimized SIA configuration produced a good linear calibration curve with a correlation coefficient (R² = 0.9812) in the concentration range of 20-140 mg/L and with a detection limit of 19.69 mg/L. Analytical applications in different food categories also showed acceptable recovery values in the range of 93.1-111.5%. This simple and rapid SIA system offers great feasibility for the saccharin quality control in food-product processing.
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Affiliation(s)
- Budi Wibowotomo
- Department of Food Science and Technology and Functional Food Research Center, Chonnam National University, YongBong-Ro 77, Gwangju 61186, Korea.
- Department of Industrial Technology, The State University of Malang, Jl Semarang 5, Malang 65145, Indonesia.
| | - Jong-Bang Eun
- Department of Food Science and Technology and Functional Food Research Center, Chonnam National University, YongBong-Ro 77, Gwangju 61186, Korea.
| | - Jong Il Rhee
- School of Chemical Engineering and Research Center for Biophotonics, Chonnam National University, YongBong-Ro 77, Gwangju 61186, Korea.
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11
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Chen Y, Li J, Lu P, Hu D, Xue W, Ding X. Development of a polyclonal antibody-based indirect competitive enzyme-linked immunosorbent assay to detect dufulin residue in water, soil and agricultural samples. FOOD AGR IMMUNOL 2017. [DOI: 10.1080/09540105.2017.1320356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Yuling Chen
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, People’s Republic of China
| | - Jing Li
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, People’s Republic of China
| | - Ping Lu
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, People’s Republic of China
| | - Deyu Hu
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, People’s Republic of China
| | - Wei Xue
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, People’s Republic of China
| | - Xiaoyan Ding
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, People’s Republic of China
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12
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Evaluation of the sweetener content in diet/light/zero foods and drinks by HPLC-DAD. Journal of Food Science and Technology 2015. [DOI: 10.1007/s13197-015-1816-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Production of Polyclonal Antibody and Development of a Competitive Enzyme-Linked Immunosorbent Assay for Benzoic Acid in Foods. FOOD ANAL METHOD 2014. [DOI: 10.1007/s12161-014-9975-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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14
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Zhang G, Wang L, Zhou X, Li Y, Gong D. Binding characteristics of sodium saccharin with calf thymus DNA in vitro. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:991-1000. [PMID: 24437661 DOI: 10.1021/jf405085g] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The binding characteristics of sodium saccharin (SSA), an artificial sweetener, with calf thymus DNA (ctDNA) were investigated by multispectroscopic techniques, chemometrics, and molecular simulation. A combined fluorescence and UV-vis spectroscopic data matrix was resolved by the multivariate curve resolution-alternating least-squares (MCR-ALS) chemometrics algorithm. The MCR-ALS analysis extracted simultaneously the concentration profiles and spectra for the three components (SSA, ctDNA, and SSA-ctDNA complex) to quantitatively monitor the SSA-ctDNA interaction, which is difficult to perform by conventional spectroscopic approach. The binding mode of SSA to ctDNA was principally through groove binding as revealed by ctDNA melting temperature studies, viscosity measurements, and iodide and salt quenching effects. Analysis of the Fourier transform infrared and circular dichroism spectra as well as molecular docking indicated that SSA preferentially bound to the guanine base of ctDNA and led to a transformation from B-like DNA structure to A-like conformation. Moreover, gel electrophoresis results suggested that SSA did not induce any significant cleavage in plasmid DNA.
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Affiliation(s)
- Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University , Nanchang 330047, China
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15
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Zhang X, Liu Y, Zhang C, Wang Y, Xu C, Liu X. Rapid isolation of single-chain antibodies from a human synthetic phage display library for detection of Bacillus thuringiensis (Bt) Cry1B toxin. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2012; 81:84-90. [PMID: 22627013 DOI: 10.1016/j.ecoenv.2012.04.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 04/21/2012] [Accepted: 04/21/2012] [Indexed: 06/01/2023]
Abstract
Single chain variable fragment antibody (scFv) is capable of binding its target antigens and is one of the most popular recombinant antibodies format for many applications. In this study, a large human synthetic phage displayed library (Tomlinson J) was employed to generate scFvs against Cry1B toxin by affinity panning. After four rounds of panning, six monoclonal phage particles capable of binding with the Cry1B were isolated, sequenced and characterized by Enzyme-Linked Immunosorbent Assay (ELISA). Two of the identified novel anti-Cry1B scFvs, namely H9 and B12, were expressed in Escherichia coli HB2151 and purified by Ni metal ion affinity chromatography. Sodium dodecyl sulfate polyacrylamine gel electrophoresis (SDS-PAGE) indicated that the relative molecular mass of scFv was estimated at 30 kDa. The purified scFv-H9 was used to develop an indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) for Cry1B toxin. The linear range of detection for standards in this ic-ELISA was approximately 0.19-1.1 μg mL⁻¹ and 50% inhibition of control (IC₅₀) was 0.84 μg mL⁻¹ for Cry1B. The affinity of scfv-H9 was (1.95±0.12) × 10⁷ M⁻¹ and showed cross-reactivity with Cry1Ab toxin and Cry1Ac toxin (8.53% and 7.58%, respectively), higher cross-reactivity (12.8%) with Cry1C toxin. The average recoveries of Cry1B toxin from spiked leaf and rice samples were in the range 89.5-96.4%, and 88.5-95.6%, respectively, with a coefficient of variation (C.V) less than 6.0%. These results showed promising applications of scfv-H9 for detecting Cry1B toxin in agricultural and environmental samples.
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Affiliation(s)
- Xiao Zhang
- Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Agriculture, 210095 Nanjing, PR China
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