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Zou M, Yin Y, Guo L, Zhang Q, Li J, Zhang H, Song Q, Li Z, Wang L, Ao X, Liang X. A Europium Nanosphere-Based Time-Resolved Fluorescent Immunochromatographic Assay for the Rapid Screening of 4,4'-Dinitrocarbanilide: Aiming at Improving Strip Method Performance. BIOSENSORS 2023; 13:bios13050518. [PMID: 37232878 DOI: 10.3390/bios13050518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 04/17/2023] [Accepted: 04/24/2023] [Indexed: 05/27/2023]
Abstract
Considering that the strip method is simple and convenient for users, a Europium nanosphere-based time-resolved fluorescent immunochromatographic assay (TRFICA) for the rapid screening of 4,4'-dinitrocarbanilide (DNC) was developed to improve the performance of strip assays. After optimization, TRFICA showed IC50, the limit of detection, and cut-off values of 0.4, 0.07, and 5.0 ng mL-1, respectively. No significant cross-reactivity (CR < 0.1%) with 15 DNC analogs was observed in the developed method. TRFICA was validated for DNC detection in spiked chicken homogenates, and recoveries ranged from 77.3% to 92.7%, with coefficients of variation of <14.9%. Moreover, the time needed for the detection procedure, including the sample pre-treatment, was less than 30 min for TRFICA, which had never been achieved before in other immunoassays. The newly developed strip test is a rapid, sensitive, quantitative, and cost-effective on-site screening technique for DNC analysis in chicken muscle.
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Affiliation(s)
- Ming Zou
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Yongkang Yin
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Liuchuan Guo
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Qidi Zhang
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Jinyan Li
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Hong Zhang
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Qian Song
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Zhaojie Li
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Li Wang
- College of Food Science and Engineering, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
| | - Xiang Ao
- Basic Medical College, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
| | - Xiao Liang
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China
- Basic Medical College, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
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Zhang X, Bai Y, Tang Q, Liu M, Nan L, Wen K, Yu X, Yu W, Shen J, Wang Z. Development of epitopephore-based rational hapten design strategy: A combination of theoretical evidence and experimental validation. JOURNAL OF HAZARDOUS MATERIALS 2023; 445:130615. [PMID: 37056019 DOI: 10.1016/j.jhazmat.2022.130615] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 12/06/2022] [Accepted: 12/13/2022] [Indexed: 06/19/2023]
Abstract
Antibody is the key biomolecule that governing the sensitivity and specificity of an immunoassay for chemical compound, also named hapten molecule. Obviously, predication of hapten effectiveness before chemical synthesis is beneficial to boost success, save cost and improve controllability. Here, we proposed and evaluated an epitopephore based rational hapten design (ERHD) to assist antibody production to chemical compound, combining theoretical evidence and then experimental validation by using dinitrocarbanilide (DNC) as a model analyte. Briefly, epitopephores of DNC were firstly generated by HipHop algorithm after features mapping. A homemade drug database also containing reported fragment haptens (HFR) and new designed full hapten (HFU) were constructed, and then was virtually screened by using generated epitopephore followed by structural analysis and visual inspection. The DNC haptens based on the selected hits were further identified by Density Functional Theory before total synthesis. To prove and clarify the usability of the ERHD, two retrieved HFU haptens, one non-retrieved HFU hapten and three non-retrieved HFR haptens were all selected to produce monoclonal antibodies (mAbs) for comparison purpose. A maximal 6000-fold increased affinity of mAb from retrieved HFU than HFR was observed, while, non-retrieved HFU failed to produce antibody to DNC. More importantly, mAbs from HFU haptens provided highly specificity to DNC, while, mAbs from HFR haptens could recognize 15 others analogues. We then constructed antibody structure and investigated molecular recognition of the mAbs to DNC, well supporting the rationality of the ERHD. Lastly, an icELISA was developed for DNC with an IC50 value as low as 0.19 ng mL-1 with high specificity, which has never achieved before.
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Affiliation(s)
- Xiya Zhang
- College of Food Science and Technology, Henan Agricultural University, 450002 Zhengzhou, People's Republic of China
| | - Yuchen Bai
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Qianqian Tang
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Minggang Liu
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Li Nan
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Kai Wen
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Xuezhi Yu
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Wenbo Yu
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Jianzhong Shen
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Zhanhui Wang
- Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory of Food Quality and Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China.
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Zhang Q, Zou M, Wang W, Li J, Liang X. Design, Synthesis, and Characterization of Tracers and Development of a Fluorescence Polarization Immunoassay for Rapid Screening of 4,4'-Dinitrocarbanilide in Chicken Muscle. Foods 2021; 10:foods10081822. [PMID: 34441602 PMCID: PMC8392466 DOI: 10.3390/foods10081822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 07/30/2021] [Accepted: 08/02/2021] [Indexed: 12/15/2022] Open
Abstract
The compound, 4,4′-dinitrocarbanilide (DNC), is the marker residue of concern in edible tissues of broilers fed with diets containing anticoccidial nicarbazin (NIC). In this study, 25 fluorescein-labeled DNC derivatives (tracers) are synthesized and characterized to develop a rapid fluorescence polarization immunoassay (FPIA) for the detection of DNC in chickens using DNC monoclonal antibodies (mAbs). The effect of the tracer structure on the sensitivity of the FPIA is investigated. Our results show that after optimization, the half maximal inhibitory concentrations (IC50) and limit of detection (LOD) of the FPIA in the buffer are 28.3 and 5.7 ng mL−1, respectively. No significant cross-reactivity (CR < 0.89%) with 15 DNC analogues is observed. The developed FPIA is validated for DNC detection in spiked chicken homogenates, and recoveries ranged from 74.2 to 85.8%, with coefficients of variation <8.6%. Moreover, the total time needed for the detection procedure of the FPIA, including sample pretreatment, is <40 min, which has not been achieved in any other immunoassays for DNC from literature. Our results demonstrate that the FPIA developed here is a simple, sensitive, specific, and reproducible screening method for DNC residues in chickens.
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Affiliation(s)
- Qidi Zhang
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China; (Q.Z.); (M.Z.); (W.W.); (J.L.)
| | - Ming Zou
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China; (Q.Z.); (M.Z.); (W.W.); (J.L.)
| | - Wanyu Wang
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China; (Q.Z.); (M.Z.); (W.W.); (J.L.)
| | - Jinyan Li
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China; (Q.Z.); (M.Z.); (W.W.); (J.L.)
| | - Xiao Liang
- College of Veterinary Medicine, Qingdao Agricultural University, No. 700 Changcheng Road, Qingdao 266109, China; (Q.Z.); (M.Z.); (W.W.); (J.L.)
- Basic Medical College, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
- Correspondence: ; Tel.: +86-139-64867-357
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Bacila DM, Feddern V, Mafra LI, Scheuermann GN, Molognoni L, Daguer H. Current research, regulation, risk, analytical methods and monitoring results for nicarbazin in chicken meat: A perspective review. Food Res Int 2017; 99:31-40. [PMID: 28784488 DOI: 10.1016/j.foodres.2017.07.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 07/01/2017] [Accepted: 07/02/2017] [Indexed: 10/19/2022]
Abstract
This review presents up-to-date information about current research on nicarbazin, one of the most used anticoccidials in poultry production. The focus is to elucidate regulation concerning nicarbazin, limits for its residues in food, how maximum residue limits in different countries are calculated regarding edible chicken tissues and the possible implications in human health. Analytical methods to extract and quantify this residue, expressed as dinitrocarbanilide (DNC) are presented and discussed, including qualitative screening and quantitative/confirmatory analytical methods. Monitoring results and occurrence of DNC residues in chicken meat are discussed. Additionally, the causes of eventual chicken meat contamination and possible solutions to reduce or eliminate DNC residue in tissues are also presented. The paper concludes with perspectives, the current state of DNC residue analysis and suggestions for future research, especially considering the gap in the study of residue recycling effect due to continuous chicken litter use.
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Affiliation(s)
- Danniele Miranda Bacila
- Universidade Federal do Paraná, Av. Coronel Francisco Heráclito dos Santos, 210, 81531-970 Curitiba, PR, Brazil
| | - Vivian Feddern
- Embrapa Suínos e Aves, BR 153, km 110, 89715-899 Concórdia, SC, Brazil.
| | - Luciana Igarashi Mafra
- Universidade Federal do Paraná, Av. Coronel Francisco Heráclito dos Santos, 210, 81531-970 Curitiba, PR, Brazil
| | | | - Luciano Molognoni
- Ministério da Agricultura, Pecuária e Abastecimento, Laboratório Nacional Agropecuário (Lanagro/RS), Rua João Grumiché, 117, 88102-699 São José, SC, Brazil
| | - Heitor Daguer
- Ministério da Agricultura, Pecuária e Abastecimento, Laboratório Nacional Agropecuário (Lanagro/RS), Rua João Grumiché, 117, 88102-699 São José, SC, Brazil
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Liquid Chromatography Tandem Mass Spectrometry Analysis of Synthetic Coccidiostats in Eggs. SEPARATIONS 2017. [DOI: 10.3390/separations4020015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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6
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Li YF, Sun YM, Beier RC, Lei HT, Gee S, Hammock BD, Wang H, Wang Z, Sun X, Shen YD, Yang JY, Xu ZL. Immunochemical techniques for multianalyte analysis of chemical residues in food and the environment: A review. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2016.12.010] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Clarke L, Fodey TL, Crooks SR, Moloney M, O'Mahony J, Delahaut P, O'Kennedy R, Danaher M. A review of coccidiostats and the analysis of their residues in meat and other food. Meat Sci 2014; 97:358-74. [DOI: 10.1016/j.meatsci.2014.01.004] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 12/18/2013] [Accepted: 01/10/2014] [Indexed: 10/25/2022]
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Screening methods and recent developments in the detection of anticoccidials. Anal Bioanal Chem 2013; 405:7733-51. [DOI: 10.1007/s00216-013-7035-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 04/30/2013] [Accepted: 04/30/2013] [Indexed: 10/26/2022]
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9
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Development of competitive enzyme-linked immunosorbent assays for boscalid determination in fruit juices. Food Chem 2012. [DOI: 10.1016/j.foodchem.2012.04.090] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Xu ZL, Shen YD, Beier RC, Yang JY, Lei HT, Wang H, Sun YM. Application of computer-assisted molecular modeling for immunoassay of low molecular weight food contaminants: A review. Anal Chim Acta 2009; 647:125-36. [DOI: 10.1016/j.aca.2009.06.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 05/30/2009] [Accepted: 06/02/2009] [Indexed: 10/20/2022]
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11
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Development of a high-throughput enzyme-linked immunosorbent assay for the routine detection of the carcinogen acrylamide in food, via rapid derivatisation pre-analysis. Anal Chim Acta 2008; 608:178-85. [DOI: 10.1016/j.aca.2007.12.013] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2007] [Revised: 12/09/2007] [Accepted: 12/13/2007] [Indexed: 11/19/2022]
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12
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Danaher M, Campbell K, O’Keeffe M, Capurro E, Kennedy G, Elliott CT. Survey of the anticoccidial feed additive nicarbazin (as dinitrocarbanilide residues) in poultry and eggs. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2007; 25:32-40. [DOI: 10.1080/02652030701552956] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Martin Danaher
- a Food Safety Department , Ashtown Food Research Centre , Teagasc, Dunsinea, Ashtown, Dublin 15, Ireland
| | - Katrina Campbell
- b Institute of Agri-Food and Land Use, Queen's University Belfast , David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK
| | - Michael O’Keeffe
- a Food Safety Department , Ashtown Food Research Centre , Teagasc, Dunsinea, Ashtown, Dublin 15, Ireland
| | - Emiliana Capurro
- a Food Safety Department , Ashtown Food Research Centre , Teagasc, Dunsinea, Ashtown, Dublin 15, Ireland
| | - Glenn Kennedy
- c Agri-Food and Biosciences Institute , Stoney Road, Stormont, Belfast, BT4 3SD, UK
| | - Christopher T. Elliott
- b Institute of Agri-Food and Land Use, Queen's University Belfast , David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK
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Fodey TL, Delahaut P, Charlier C, Elliott CT. Comparison of three adjuvants used to produce polyclonal antibodies to veterinary drugs. Vet Immunol Immunopathol 2007; 122:25-34. [PMID: 18063100 DOI: 10.1016/j.vetimm.2007.10.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2007] [Revised: 10/23/2007] [Accepted: 10/25/2007] [Indexed: 11/26/2022]
Abstract
Two commercially available adjuvants, Gerbu LQ 3000 and Montanide ISA 50V, were assessed as potential replacements for Freund's adjuvant by evaluating their efficacy in the production of polyclonal antibodies to veterinary drugs in rabbits. The aim was to find an adjuvant that could produce a similar (or enhanced) immune response in the host animal without the undesirable side effects associated with Freund's complete and incomplete adjuvant. The assessment involved the examination of each injection site and the characterisation of the resultant antibodies with regards to antibody titre and sensitivity. It was found that the rabbits immunised with Gerbu adjuvant produced some of the most sensitive antibodies. However, titres were relatively low and adverse effects at injection sites were relatively common. Montanide adjuvant produced no adverse effects and the related antibodies were found to be of adequate sensitivity when compared to those from rabbits immunised with Freund's. It was concluded that Montanide ISA 50V could be considered as a suitable replacement to Freund's for the production of polyclonal antibodies, to low molecular weight compounds in rabbits.
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Affiliation(s)
- Terence L Fodey
- Agri-Food and Biosciences Institute, Veterinary Sciences Division, Stoney Road, Belfast BT4 3SD, UK.
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Fodey TL, Delahaut P, Elliott CT. Use of antigen mimics to produce specific antibodies to anti-coccidial drugs. J Immunol Methods 2007; 323:31-8. [PMID: 17433817 DOI: 10.1016/j.jim.2007.03.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2006] [Revised: 03/09/2007] [Accepted: 03/11/2007] [Indexed: 11/21/2022]
Abstract
A range of polyclonal antibodies was successfully produced to the coccidiostatic drugs diclazuril and robenidine. Initial attempts to make immunogenic complexes of both drugs were ineffective due to difficulties encountered while trying to couple the compounds to large carrier proteins. Structural mimics, which could act as haptens for each drug, were sought and identified. The compounds identified were more open to chemical manipulation and were conjugated to carrier proteins to produce effective immunogens. The most sensitive antisera produced displayed IC50s of 1.5 ng/ml and 13 ng/ml for diclazuril and robenidine respectively. The antibody for diclazuril was shown to be specific, cross-reacting only with clazuril by 15%. The robenidine antibody displayed a low cross-reactivity of 1.2% to the compound used to produce the antibody.
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Affiliation(s)
- Terence L Fodey
- Agri-Food and Biosciences Institute, Veterinary Sciences Division, Stoney Road, Belfast BT4 3SD, UK.
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Campbell K, Fodey T, Flint J, Danks C, Danaher M, O'Keeffe M, Kennedy DG, Elliott C. Development and validation of a lateral flow device for the detection of nicarbazin contamination in poultry feeds. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:2497-503. [PMID: 17319682 DOI: 10.1021/jf062811d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Concentrations of the coccidiostat nicarbazin as low as 2 mg/kg in feed can result in violative drug residues arising in poultry liver. A lateral flow device (LFD) was developed for the detection of contaminating concentrations of nicarbazin following solvent extraction of poultry feeds. Test results, as determined by both visual and instrumental measurement, are available within minutes. For 22 feed samples, nicarbazin-free and fortified at 2 mg/kg, the % relative inhibition ranged from 0 to 45% and from 53 to 85%, respectively. Nicarbazin contamination at the critical concentration (2 mg/kg) can be determined in all cases providing the sampling is representative. A wide range of feed samples taken at a mill that incorporated nicarbazin into poultry feed were analyzed. Data generated for these samples by both the LFDs and a mass spectrometric method were compared, and a significant correlation was achieved.
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Affiliation(s)
- Katrina Campbell
- Institute of Agri-Food and Land Use, Queen's University, David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK.
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Huet AC, Mortier L, Daeseleire E, Fodey T, Elliott C, Delahaut P. Screening for the coccidiostats halofuginone and nicarbazin in egg and chicken muscle: development of an ELISA. ACTA ACUST UNITED AC 2007; 22:128-34. [PMID: 15824002 DOI: 10.1080/02652030500038041] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Nicarbazin and halofuginone have been widely used as coccidiostats for the prevention and treatment of coccidiosis in poultry. It has been shown that accidental cross-contamination of feed can lead to residues of these compounds in eggs and/or muscle. This paper describes a direct competitive assay for detecting halofuginone and nicarbazin, developed as qualitative screening assay. In an optimized competitive ELISA, antibodies showed 50% binding inhibition at approximately 0.08 ng ml(-1) for halofuginone and 2.5 ng ml(-1) for dinitrocarbanilide (marker residue for nicarbazin). Extraction from the matrix was carried out with acetonitrile followed by a wash with hexane. The assay's detection capability (CCbeta) for halofuginone was < 0.5 microg kg(-1) in egg and < 1 microg kg(-1) in muscle. For dinitrocarbanilide, the CCbeta was estimated at < 3 microg kg(-1) in egg and < 10 microg kg(-1) in chicken muscle.
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Affiliation(s)
- A-C Huet
- Centre d'Economie Rurale, laboratoire d'Hormonologie Animale, Marloie, Belgium
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17
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Missailidis S, Thomaidou D, Borbas KE, Price MR. Selection of aptamers with high affinity and high specificity against C595, an anti-MUC1 IgG3 monoclonal antibody, for antibody targeting. J Immunol Methods 2005; 296:45-62. [PMID: 15680150 DOI: 10.1016/j.jim.2004.10.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2003] [Revised: 10/19/2004] [Accepted: 10/25/2004] [Indexed: 11/28/2022]
Abstract
Targeting of antibodies has found a number of applications in assays, anti-idiotypic therapies and vaccine design with a number of anti-idiotypic Abs generated and used in clinical applications, and some currently in clinical trials. Meanwhile, aptamers are a novel and particularly interesting targeting modality, with a unique ability to bind to a variety of targets. Aptamers offer unique benefits compared to other targeting agents, due to their high affinity and selectivity, relatively small size and in vitro synthesis, making them attractive alternatives to Abs and peptides. Aptamers have already been selected against a number of Abs for various applications. We now present a novel methodology for the selection of aptamers against Abs, which minimises the number of steps used and results in molecules that bind to the target Ab with high affinity and specificity. We have used the well-characterised anti-MUC1 monoclonal Ab C595 as an exemplar for raising aptamers against Abs. The methodology is based on the adsorption of the Ab to the surface of a PCR tube and the performance of SELEX selections in the PCR tube, based on elution steps resulting from the denaturation of the Ab on the first PCR amplification cycle. After 10 rounds of selection and amplification, selected aptamers have been characterised using a number of techniques, including fluorescence quenching, ELISA and competition ELISA procedures and a FRET type assay. Aptamers were found to bind their target Ab with a higher affinity than its natural antigenic peptide, as observed in fluorescent quenching and FRET experiments. Furthermore, they were able to displace the antigens from the antibody binding pocket in competition assays. This methodology offers the possibility of rapidly selecting aptamers for antibody targeting that could be used as diagnostic, imaging or therapeutic agents, or as recognition units in immunoassays, and can be potentially useful in raising aptamers against other protein targets.
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Affiliation(s)
- Sotiris Missailidis
- Chemistry Department, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK.
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18
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Hagren V, Crooks SRH, Elliott CT, Lövgren T, Tuomola M. An all-in-one dry chemistry immunoassay for the screening of coccidiostat nicarbazin in poultry eggs and liver. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2004; 52:2429-2433. [PMID: 15113136 DOI: 10.1021/jf030758c] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
An automated immunoassay for the detection of nicarbazin residues in poultry eggs and liver was developed. The assay was based on a novel all-in-one dry chemistry concept and time-resolved fluorometry. The analyte specific antibody was immobilized into a single microtiter well and covered with an insulation layer, on top of which the label was dried in a small volume. The extracted sample was added automatically to the dry microtiter well, and the result was available within 18 min. Due to the rapidity and simplicity, the quantitative immunoassay could also be used as a high throughput screening method. The analytical limit of detection for the assay was calculated as 0.1 ng mL(-)(1) (n = 12) and the functional limit of detection as 3.2 ng g(-)(1) for egg (n = 6) and 11.3 ng g(-)(1) for liver (n = 6) samples. The sample recovery varied from 97.3 to 115.6%. Typically, the intra-assay variations were less than 10%, and interassay variations ranged between 8.1 and 13.6%.
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Affiliation(s)
- Virve Hagren
- Department of Biotechnology, University of Turku, Tykistökatu 6A, FIN-20520 Turku, Finland.
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19
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Fodey TL, Connolly L, Crooks SR, Delahaut P, Elliott CT. Production and characterisation of polyclonal antibodies to a range of nitroimidazoles. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00015-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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McCarney B, Traynor IM, Fodey TL, Crooks SR, Elliott CT. Surface plasmon resonance biosensor screening of poultry liver and eggs for nicarbazin residues. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(02)01470-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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