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Jin Y, Jin Z, Sun D, Liu Y, Xu B, Zhao Q, He Y, Gong L, Li J, Zhang Y, Cui Y. Hapten synthesis, monoclonal antibody production and immunoassay development for analyzing spiropidion residues. Food Chem 2024; 453:139697. [PMID: 38788652 DOI: 10.1016/j.foodchem.2024.139697] [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: 02/08/2024] [Revised: 04/27/2024] [Accepted: 05/11/2024] [Indexed: 05/26/2024]
Abstract
Spiropidion developed by Syngenta shows high insecticidal and acaricidal activity against a wide range of sucking pests. In this study, according to the structure of spiropidion, two haptens were synthesized by introducing carboxyl groups from the ester group. After cell fusion, a monoclonal antibody (mAb 8B5) of spiropidion was obtained. The IC50 of the established heterologous indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) was 7.36 ng/mL, and its working range was 1.75-34.92 ng/mL. The average recoveries were 76.05-124.78% in the Yangtze River and citrus samples. Moreover, the ic-ELISA results of 15 citrus samples agreed well with ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Overall, the established ic-ELISA could be applied for the spiropidion residue monitor in food and agricultural samples.
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Affiliation(s)
- Yaqi Jin
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Zihui Jin
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Di Sun
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yifan Liu
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Bo Xu
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Qiyang Zhao
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yue He
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Lei Gong
- Key Laboratory of Detection Technology of Focus Chemical Hazards in Animal-derived Food for State Market Regulation, Hubei Provincial Institute for Food Supervision and Test, Wuhan 430075, China
| | - Jing Li
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yaohai Zhang
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China
| | - Yongliang Cui
- Key Laboratory of Quality and Safety Control of Citrus Fruits, Ministry of Agriculture and Rural Affairs, Southwest University, Chongqing 400712, China; National Citrus Engineering Research Center, Chongqing 400712, PR China; Laboratory of Quality & Safety Risk Assessment for Citrus Products (Chongqing), Ministry of Agriculture, Citrus Research Institute, Southwest University, Chongqing 400712, China.
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Novel nandrolone aptamer for rapid colorimetric detection of anabolic steroids. Anal Biochem 2022; 658:114937. [DOI: 10.1016/j.ab.2022.114937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/25/2022] [Accepted: 09/29/2022] [Indexed: 11/19/2022]
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Yang YY, Wang Y, Zhang YF, Wang F, Liang YF, Yang JY, Xu ZL, Shen YD, Wang H. Nanobody-Based Indirect Competitive ELISA for Sensitive Detection of 19-Nortestosterone in Animal Urine. Biomolecules 2021; 11:biom11020167. [PMID: 33513883 PMCID: PMC7912623 DOI: 10.3390/biom11020167] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/21/2021] [Accepted: 01/21/2021] [Indexed: 01/20/2023] Open
Abstract
Nanobody (Nb), a new type of biorecognition element generally from Camelidae, has the characteristics of small molecular weight, high stability, great solubility and high expression level in E. coli. In this study, with 19-nortestosterone (19-NT), an anabolic androgenic steroid as target drug, three specific Nbs against 19-NT were selected from camel immune library by phage display technology. The obtained Nbs showed excellent thermostability and organic solvent tolerance. The nanobody Nb2F7 with the best performance was used to develop a sensitive indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) for 19-NT detection. Under optimized conditions, the standard curve of ic-ELISA was fitted with a half-maximal inhibitory concentration (IC50) of 1.03 ng/mL and a detection limit (LOD) of 0.10 ng/mL for 19-NT. Meanwhile, the developed assay had low cross- reactivity with analogs and the recoveries of 19-NT ranged from 82.61% to 99.24% in spiked samples. The correlation coefficient between ic-ELISA and the ultra-performance liquid chromatography/mass spectrometry (UPLC-MS/MS) method was 0.9975, which indicated that the nanobody-based ic-ELISA could be a useful tool for a rapid analysis of 19-NT in animal urine samples.
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Affiliation(s)
- Yuan-yuan Yang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
| | - Yu Wang
- Guangzhou Institute of Food Inspection, Guangzhou 510080, China;
| | - Yi-feng Zhang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
| | - Feng Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
| | - Yi-fan Liang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
| | - Jin-yi Yang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
| | - Zhen-lin Xu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
| | - Yu-dong Shen
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
- Correspondence: (Y.-d.S.); (H.W.); Tel.: +86-20-85283448 (H.W.); Fax: +86-20-85280270 (H.W.)
| | - Hong Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, National-Local Joint Engineering Research, Center for Processing and Safety Control of Livestock and Poultry Products, College of Food Science, South China Agricultural University, Guangzhou 510642, China; (Y.-y.Y.); (Y.-f.Z.); (F.W.); (Y.-f.L.); (J.-y.Y.); (Z.-l.X.)
- Correspondence: (Y.-d.S.); (H.W.); Tel.: +86-20-85283448 (H.W.); Fax: +86-20-85280270 (H.W.)
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Keglevich A, Zsiros V, Keglevich P, Szigetvári Á, Dékány M, Szántay C, Mernyák E, Wölfling J, Hazai L. Synthesis and In Vitro Antitumor Effect of New Vindoline-steroid Hybrids. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190614113218] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
10-Aminovindoline and 17-desacetylvindoline were coupled with 5α-
dihydrotestosterone hemisuccinate and 19-nortestosterone hemisuccinate. As a result,
four vindoline-steroid hybrids were synthesized via a succinate linker. One of the new
hybrid compounds showed significant anticancer effect in vitro in the case of colon cancer
and melanoma cell lines.
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Affiliation(s)
- András Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
| | - Vivian Zsiros
- Quality Process Development Department, Egis Pharmaceuticals Plc., H-1106 Budapest, Kereszturi ut 30-38, Hungary
| | - Péter Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
| | - Áron Szigetvári
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Miklós Dékány
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Dom ter 8, Hungary
| | - János Wölfling
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Dom ter 8, Hungary
| | - László Hazai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
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Jurášek M, Göselová S, Mikšátková P, Holubová B, Vyšatová E, Kuchař M, Fukal L, Lapčík O, Drašar P. Highly sensitive avidin-biotin ELISA for detection of nandrolone and testosterone in dietary supplements. Drug Test Anal 2016; 9:553-560. [DOI: 10.1002/dta.2005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 05/10/2016] [Accepted: 05/12/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Michal Jurášek
- University of Chemistry and Technology Prague; Prague Czech Republic
| | - Sandra Göselová
- University of Chemistry and Technology Prague; Prague Czech Republic
| | - Petra Mikšátková
- University of Chemistry and Technology Prague; Prague Czech Republic
| | - Barbora Holubová
- University of Chemistry and Technology Prague; Prague Czech Republic
| | - Eva Vyšatová
- Czech Agriculture and Food Inspection Authority; Prague Czech Republic
| | - Martin Kuchař
- University of Chemistry and Technology Prague; Prague Czech Republic
| | - Ladislav Fukal
- University of Chemistry and Technology Prague; Prague Czech Republic
| | - Oldřich Lapčík
- University of Chemistry and Technology Prague; Prague Czech Republic
| | - Pavel Drašar
- University of Chemistry and Technology Prague; Prague Czech Republic
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Schneider G, Kiss A, Mernyák E, Benke Z, Wölfling J, Frank É, Bózsity N, Gyovai A, Minorics R, Zupkó I. Stereocontrolled synthesis of the four 16-hydroxymethyl-19-nortestosterone isomers and their antiproliferative activities. Steroids 2016; 105:113-20. [PMID: 26686898 DOI: 10.1016/j.steroids.2015.12.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 11/11/2015] [Accepted: 12/01/2015] [Indexed: 11/22/2022]
Abstract
Novel 16-hydroxymethyl-19-nortestosterone diastereomers were prepared by Birch reduction from the corresponding 3-methoxy-16-hydroxymethylestra-1,3,5(10)-trien-17-ol isomers with known configurations. The synthesized compounds are 16α- and 16β-hydroxymethyl-substituted 19-nortestosterone and their 17α-epimers. To prepare 17α-19-nortestosterone, the Mitsunobu inversion reaction of 19-nortestosterone with different alkyl and aryl carboxylic acids was chosen. Deacylation of the new compounds by the Zemplén method yielded the required 17α-19-nortestosterone. The antiproliferative activities of the structurally related compounds were determined in vitro through microculture tetrazolium assays on a panel of human adherent cervical (HeLa, SiHa and C33A), breast (MCF-7, MDA-MB-231, MDA-MB-361 and T47D) and ovarian (A2780) cell lines. The 17α epimer of 19-nortestosterone demonstrated considerable activity, selectively for HeLa cells, with a calculated IC50 of 0.65 μM. The reference compound, cisplatin, displayed an order of magnitude higher IC50 (12.4 μM). The cancer selectivity of 17α-19-nortestosterone was tested by MTT assay performed with noncancerous human fibroblast cell line MRC-5. The results indicated that 17α-19-nortestosterone selectively disturbs the viability of HeLa cells without greatly affecting other cancer cell types and intact fibroblasts.
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Affiliation(s)
- Gyula Schneider
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary.
| | - Anita Kiss
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - Zsanett Benke
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - János Wölfling
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - Éva Frank
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - Noémi Bózsity
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6., H-6720 Szeged, Hungary
| | - András Gyovai
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6., H-6720 Szeged, Hungary
| | - Renáta Minorics
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6., H-6720 Szeged, Hungary
| | - István Zupkó
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6., H-6720 Szeged, Hungary.
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Wang H, Li J, Zhang X, Hu B, Liu Y, Zhang L, Cha R, Sun J, Jiang X. A microfluidic indirect competitive immunoassay for multiple and sensitive detection of testosterone in serum and urine. Analyst 2015; 141:815-9. [PMID: 26804930 DOI: 10.1039/c5an01835h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate a microfluidic-based indirect competitive chemiluminescence enzyme immunoassay (MIC) for multiple, sensitive, reliable and rapid detection of testosterone in human serum and urine samples. As MIC can detect biomarkers in a cost-effective and easy-to-operate manner, it may have great potential for clinical diagnosis and point-of-care testing (POCT).
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Affiliation(s)
- Huashan Wang
- School of Chemical Engineering and Material Science, Tianjin University of Science and Technology, Tianjin 300457, China
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Jurášek M, Rimpelová S, Pavlíčková V, Ruml T, Lapčík O, Drašar PB. Synthesis and biological evaluation of nandrolone-bodipy conjugates. Steroids 2015; 97:62-6. [PMID: 25448362 DOI: 10.1016/j.steroids.2014.10.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 09/19/2014] [Accepted: 10/01/2014] [Indexed: 11/30/2022]
Abstract
Here, we report synthesis and biological evaluation of fluorescent nandrolone-3-carboxymethyloxime derivatives conjugated with green-emitting bodipy dye via PEG linkers. All the newly-synthesized compounds were evaluated for their effect on cell proliferation in vitro in MCF-7, LNCaP, PC-3 and HEK 293T model cell lines using WST-1 assay. By means of live-cell fluorescence microscopy, the intracellular localization of nandrolone-bodipy conjugates was revealed in endoplasmic reticulum. Moreover, we performed competitive localization study with nonfluorescent nandrolone, metandrolone, boldenone, trenbolone, and testosterone.
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Affiliation(s)
- Michal Jurášek
- Department of Chemistry of Natural Compounds, Institute of Chemical Technology in Prague, 166 28 Prague, Czech Republic
| | - Silvie Rimpelová
- Department of Biochemistry and Microbiology, Institute of Chemical Technology in Prague, 166 28 Prague, Czech Republic
| | - Vladimíra Pavlíčková
- Department of Biochemistry and Microbiology, Institute of Chemical Technology in Prague, 166 28 Prague, Czech Republic
| | - Tomáš Ruml
- Department of Biochemistry and Microbiology, Institute of Chemical Technology in Prague, 166 28 Prague, Czech Republic
| | - Oldřich Lapčík
- Department of Chemistry of Natural Compounds, Institute of Chemical Technology in Prague, 166 28 Prague, Czech Republic
| | - Pavel B Drašar
- Department of Chemistry of Natural Compounds, Institute of Chemical Technology in Prague, 166 28 Prague, Czech Republic.
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Jiang JQ, Zhang HT, Zhang HH, Wang ZL, Yang XF, Fan GY. Development of an enzyme-linked immunosorbent assay for detection of clopidol residues in chicken tissues. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2014; 94:2295-2300. [PMID: 24395395 DOI: 10.1002/jsfa.6557] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Revised: 11/09/2013] [Accepted: 01/06/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND Clopidol is mainly used for the prevention and treatment of coccidiosis, which poses a serious potential hazard to public health, in veterinary medicine. The aim of this study was to prepare monoclonal antibodies (mAbs) against clopidol (CLOP) and develop an immunoassay for detecting CLOP residues in chicken tissues. After derivation, CLOP hapten was conjugated to carrier proteins to synthesize the artificial antigen, and immunized Balb/C mice were employed to screen mAbs. RESULTS A sensitive hybridoma named C1G3 was screened out and two indirect competitive enzyme-linked immunosorbent assay (icELISA) standard curves were established. For the traditional two-step assay the linear range was from 0.06 to 98 ng mL(-1) , with half-maximal inhibitory concentration (IC50 ) and limit of detection (LOD) values of 2.76 ng mL(-1) and 0.03 ng mL(-1) respectively, while the rapid one-step icELISA had a working range from 0.08 to 102 ng mL(-1) , with IC50 and LOD values of 3.52 ng mL(-1) and 0.03 ng mL(-1) respectively. It was also indicated that a 10-fold dilution in chicken muscles gave an inhibition curve almost the same as that obtained in phosphate-buffered saline. When applied to spiking tests in chicken samples, the correlation coefficient (R(2) ) between concentrations added and measured was 0.9534. CONCLUSION The results of this study suggest that the immunoassay described is a promising alternative for screening CLOP residues in biological matrices and is suitable for routine diagnostics.
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Affiliation(s)
- Jin-Qing Jiang
- Henan Institute of Science and Technology, Xinxiang, 453003, China
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Zhang HT, Jiang JQ, Wang ZL, Chen JJ, Wang SY, Ding H, Li XP, Li Y. Preparation and validation of monoclonal antibody-based indirect competitive ELISA for detecting testosterone levels. FOOD AGR IMMUNOL 2013. [DOI: 10.1080/09540105.2013.775221] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Fan GY, Yang RS, Jiang JQ, Chang XY, Chen JJ, Qi YH, Wu SX, Yang XF. Development of a class-specific polyclonal antibody-based indirect competitive ELISA for detecting fluoroquinolone residues in milk. J Zhejiang Univ Sci B 2012; 13:545-54. [PMID: 22761246 DOI: 10.1631/jzus.b1200001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Modified 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) method was employed to synthesize the artificial antigen of norfloxacin (NOR), and New Zealand rabbits were used to produce anti-NOR polyclonal antibody (pAb). Based on the checkerboard titration, an indirect competitive enzyme-linked immunosorbent assay (icELISA) standard curve was established. This assay was sensitive and had a working range from 0.12 to 68.40 ng/ml, with the half maximal inhibitory concentration (IC(50)) and limit of detection (LOD) values of 2.7 ng/ml and 0.06 ng/ml, respectively. The produced pAb exhibited high cross-reactivity to fluoroquinolones (FQs) tested, and the IC(50) values to enoxacin, ciprofloxacin, and pefloxacin were 3.1, 3.4, and 4.1 ng/ml, respectively. It also indicated that the concentrations of NaOH and methanol in assay buffer should not be higher than 10% and 30%. When spiked in milk at 5, 20, and 50 ng/ml, the recoveries for NOR, enoxacin, ciprofloxacin, and pefloxacin ranged 90.5%-98.0%, 84.0%-95.2%, 94.0%-106.0%, and 89.5%-100.0%, respectively. The results suggest that this class-specific pAb-based icELISA could be utilized for the primary screening of FQ residues in animal-original products.
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Affiliation(s)
- Guo-ying Fan
- College of Veterinary Medicine, Northwest A&F University, Yangling, China
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Abstract
This paper reports an indirect competitive enzyme-linked immunosorbent assay (icELISA) using polyclonal antibody (pAb) for estradiol (E2) residues. After derivation, E2 haptens were conjugated to bovine serum albumin (BSA) and ovalbumin (OVA) through 1-Ethyl-3-(3-dimethylaminopropy) carbodiimide (EDC) method, and New Zealand white rabbits were immunized to produce anti-E2 pAb. The conjugation ratio of E2-BSA was proved to be 18.6:1 by an UV absorbance method. Based on the square matrix titration, an icELISA standard curve was developed. The dynamic range was from 0.16 to 128 ng/mL, with LOD and IC50 value of 0.08 ng/mL and 3.76 ng/mL, respectively. Except for a little cross-reactivity (16.2%) to estrone, this assay showed negligible cross-reactivity to other analogues tested. The results suggest that the produced anti-E2 pAb could be used to develop an icELISA method for the determination of E2 residues in animal-originally products.
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Jinqing J, Haitang Z, Zhixing A, Zhiyong X, Xuefeng Y, Huaguo H, Ziliang W. Development of an Heterologous Immunoassay for Ciprofloxacin Residue in Milk. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.phpro.2012.03.318] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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