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Roda A, Arduini F, Mirasoli M, Zangheri M, Fabiani L, Colozza N, Marchegiani E, Simoni P, Moscone D. A challenge in biosensors: Is it better to measure a photon or an electron for ultrasensitive detection? Biosens Bioelectron 2020; 155:112093. [DOI: 10.1016/j.bios.2020.112093] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 02/07/2020] [Accepted: 02/11/2020] [Indexed: 01/06/2023]
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Ahmed S, Ning J, Cheng G, Ahmad I, Li J, Mingyue L, Qu W, Iqbal M, Shabbir MAB, Yuan Z. Receptor-based screening assays for the detection of antibiotics residues - A review. Talanta 2017; 166:176-186. [PMID: 28213220 DOI: 10.1016/j.talanta.2017.01.057] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 01/14/2017] [Accepted: 01/20/2017] [Indexed: 12/24/2022]
Abstract
Consumer and regulatory agencies have a high concern to antibiotic residues in food producing animals, so appropriate screening assays of fast, sensitive, low cost, and easy sample preparation for the identification of these residues are essential for the food-safety insurance. Great efforts in the development of a high-throughput antibiotic screening assay have been made in recent years. Concerning the screening of antibiotic residue, this review elaborate an overview on the availability, advancement and applicability of antibiotic receptor based screening assays for the safety assessment of antibiotics usage (i.e. radio receptor assay, enzyme labeling assays, colloidal gold receptor assay, enzyme colorimetry assay and biosensor assay). This manuscript also tries to shed a light on the selection, preparation and future perspective of receptor protein for antibiotic residue detection. These assays have been introduced for the screening of numerous food samples. Receptor based screening technology for antibiotic detection has high accuracy. It has been concluded that at the same time, it can detect a class of drugs for certain receptor, and realize the multi-residue detection. These assays offer fast, easy and precise detection of antibiotics.
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Affiliation(s)
- Saeed Ahmed
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China
| | - Jianan Ning
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China
| | - Guyue Cheng
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan 430070, China
| | - Ijaz Ahmad
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China; The University of Agriculture Peshawar, Pakistan
| | - Jun Li
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China
| | - Liu Mingyue
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China
| | - Wei Qu
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan 430070, China
| | - Mujahid Iqbal
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China
| | - M A B Shabbir
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China
| | - Zonghui Yuan
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MOA Key Laboratory for the Detection of Veterinary Drug Residues in Foods, Huazhong Agricultural University, Wuhan 430070, China; MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan 430070, China.
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Pilehvar S, Gielkens K, Trashin SA, Dardenne F, Blust R, De Wael K. (Electro)Sensing of Phenicol Antibiotics—A Review. Crit Rev Food Sci Nutr 2015; 56:2416-29. [DOI: 10.1080/10408398.2013.845140] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Karaseva NA, Ermolaeva TN. Piezoelectric immunosensors for the detection of individual antibiotics and the total content of penicillin antibiotics in foodstuffs. Talanta 2013; 120:312-7. [PMID: 24468375 DOI: 10.1016/j.talanta.2013.12.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Revised: 11/29/2013] [Accepted: 12/06/2013] [Indexed: 11/18/2022]
Abstract
Piezoelectric immunosensors on the basis of homologous and group-specificantibodies have been developed for detecting penicillin G, ampicillin, and the total content of penicillin antibiotics. The receptor coating of the sensor was obtained by the immobilization of penicillin G or ampicillin hapten-protein conjugates on the polypyrrole film obtained by electropolymerization and activated by glutaraldehyde. The affinity constants and the cross reactivity coefficients have been calculated. This made it possible to estimate the affinity and specificity of the polyclonal and monoclonal antibodies used. The calibration curves are linear in the range of concentrations 2.5-250.0 ng ml(-1) (penicillin G), 2.5-500.0 ng ml(-1) (ampicillin), and 1-500 ng ml(-1) (group of penicillin). The limits of detection are 0.8 ng ml(-1), 3.9 ng ml(-1), which are lower than MRL, established for penicillin antibiotics. The sensors were tested in detecting penicillins in milk, pork, beef, liver.
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Affiliation(s)
- N A Karaseva
- Lipetsk State Technical University, 30 Moskovskaya St., Lipetsk 398600, Russia.
| | - T N Ermolaeva
- Lipetsk State Technical University, 30 Moskovskaya St., Lipetsk 398600, Russia
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Zhang J, Wang Z, Wen K, Liang X, Shen J. Penicillin-binding protein 3 of Streptococcus pneumoniae and its application in screening of β-lactams in milk. Anal Biochem 2013; 442:158-65. [DOI: 10.1016/j.ab.2013.07.042] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 07/29/2013] [Indexed: 10/26/2022]
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Label-Free Amperometric Magnetoimmunosensors for Direct Determination of Lactoperoxidase in Milk. ELECTROANAL 2013. [DOI: 10.1002/elan.201300027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Conzuelo F, Gamella M, Campuzano S, Martínez-Ruiz P, Esteban-Torres M, de las Rivas B, Reviejo AJ, Muñoz R, Pingarrón JM. Integrated Amperometric Affinity Biosensors Using Co2+–Tetradentate Nitrilotriacetic Acid Modified Disposable Carbon Electrodes: Application to the Determination of β-Lactam Antibiotics. Anal Chem 2013; 85:3246-54. [DOI: 10.1021/ac303604b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - María Esteban-Torres
- Laboratorio de Biotecnología
Bacteriana, Instituto de Ciencia y Tecnología de Alimentos y Nutrición, C/Juan de la Cierva
3, 28006 Madrid, Spain
| | - Blanca de las Rivas
- Laboratorio de Biotecnología
Bacteriana, Instituto de Ciencia y Tecnología de Alimentos y Nutrición, C/Juan de la Cierva
3, 28006 Madrid, Spain
| | | | - Rosario Muñoz
- Laboratorio de Biotecnología
Bacteriana, Instituto de Ciencia y Tecnología de Alimentos y Nutrición, C/Juan de la Cierva
3, 28006 Madrid, Spain
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Gamella M, Campuzano S, Conzuelo F, Esteban-Torres M, de las Rivas B, Reviejo AJ, Muñoz R, Pingarrón JM. An amperometric affinity penicillin-binding protein magnetosensor for the detection of β-lactam antibiotics in milk. Analyst 2013; 138:2013-22. [DOI: 10.1039/c3an36727d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Babington R, Matas S, Marco MP, Galve R. Current bioanalytical methods for detection of penicillins. Anal Bioanal Chem 2012; 403:1549-66. [DOI: 10.1007/s00216-012-5960-4] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 03/09/2012] [Accepted: 03/19/2012] [Indexed: 12/01/2022]
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Conzuelo F, Gamella M, Campuzano S, Pinacho DG, Reviejo AJ, Marco MP, Pingarrón JM. Disposable and integrated amperometric immunosensor for direct determination of sulfonamide antibiotics in milk. Biosens Bioelectron 2012; 36:81-8. [PMID: 22538058 DOI: 10.1016/j.bios.2012.03.044] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 03/26/2012] [Accepted: 03/29/2012] [Indexed: 02/02/2023]
Abstract
The preparation and performance of a disposable amperometric immunosensor, based on the use of a selective capture antibody and screen-printed carbon electrodes (SPCEs), for the specific detection and quantification of sulfonamide residues in milk is reported. The antibody was covalently immobilized onto a 4-aminobenzoic acid (4-ABA) film grafted on the disposable electrode, and a direct competitive immunoassay using a tracer with horseradish peroxidase (HRP) for the enzymatic labeling was performed. The amperometric response measured at -0.2 V vs the silver pseudo-reference electrode of the SPCE upon the addition of H(2)O(2) in the presence of hydroquinone (HQ) as mediator was used as transduction signal. The developed methodology showed very low limits of detection (in the low ppb level) for 6 sulfonamide antibiotics tested in untreated milk samples, and a good selectivity against other families of antibiotics residues frequently detected in milk and dairy products. These features, together with the short analysis time (30 min), the simplicity, and easy automation and miniaturization of the required instrumentation make the developed methodology a promising alternative in the development of devices for on-site analysis.
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Affiliation(s)
- Felipe Conzuelo
- Departamento de Química Analítica, Facultad de CC. Químicas, Universidad Complutense de Madrid, Madrid, Spain
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Sanvicens N, Mannelli I, Salvador JP, Valera E, Marco MP. Biosensors for pharmaceuticals based on novel technology. Trends Analyt Chem 2011. [DOI: 10.1016/j.trac.2011.01.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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12
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Zhang X, Chen L, Xu Y, Wang H, Zeng Q, Zhao Q, Ren N, Ding L. Determination of β-lactam antibiotics in milk based on magnetic molecularly imprinted polymer extraction coupled with liquid chromatography–tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:3421-6. [DOI: 10.1016/j.jchromb.2010.10.030] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2010] [Revised: 10/12/2010] [Accepted: 10/27/2010] [Indexed: 11/15/2022]
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13
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Gustavsson E, Bjurling P, Degelaen J, Sternesjö Å. Analysis ofβ-Lactam Antibiotics Using a Microbial Receptor Protein-based Biosensor Assay. FOOD AGR IMMUNOL 2010. [DOI: 10.1080/09540100220145142] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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Chen B, Ma M, Su X. An amperometric penicillin biosensor with enhanced sensitivity based on co-immobilization of carbon nanotubes, hematein, and β-lactamase on glassy carbon electrode. Anal Chim Acta 2010; 674:89-95. [DOI: 10.1016/j.aca.2010.06.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Revised: 06/09/2010] [Accepted: 06/09/2010] [Indexed: 10/19/2022]
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Biswas A, Kondaiah N, Anjaneyulu A, Mandal P. Food Safety Concerns of Pesticides, Veterinary Drug Residues and Mycotoxins in Meat and Meat Products. ACTA ACUST UNITED AC 2010. [DOI: 10.3923/ajas.2010.46.55] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Yildiz �, Unluturk S. Differential scanning calorimetry as a tool to detect antibiotic residues in ultra high temperature whole milk. Int J Food Sci Technol 2009. [DOI: 10.1111/j.1365-2621.2009.02087.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Analytical methodologies for the detection of β-lactam antibiotics in milk and feed samples. Trends Analyt Chem 2009. [DOI: 10.1016/j.trac.2009.04.005] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Electrochemical sensors and biosensors based on heterogeneous carbon materials. MONATSHEFTE FUR CHEMIE 2009. [DOI: 10.1007/s00706-009-0131-9] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Rodriguez-Mozaz S, Lopez de Alda MJ, Barceló D. Advantages and limitations of on-line solid phase extraction coupled to liquid chromatography–mass spectrometry technologies versus biosensors for monitoring of emerging contaminants in water. J Chromatogr A 2007; 1152:97-115. [PMID: 17275010 DOI: 10.1016/j.chroma.2007.01.046] [Citation(s) in RCA: 181] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2006] [Revised: 12/22/2006] [Accepted: 01/12/2007] [Indexed: 11/29/2022]
Abstract
On-line solid phase extraction (SPE) coupled to liquid chromatography-mass spectrometry (LC-MS) and biosensors are advanced technologies that have found increasing application in the analysis of environmental contaminants although their application to the determination of emerging contaminants (previously unknown or unrecognized pollutants) has been still limited. This review covers the most recent advances occurred in the areas of on-line SPE-LC-MS and biosensors, discusses and compares the main strengths and limitations of the two approaches, and examines their most relevant applications to the analysis of emerging contaminants in environmental waters. So far, the on-line configuration most frequently used has been SPE coupled to liquid chromatography-(tandem) mass spectrometry. Sorbents used for on-line SPE have included both traditional (alkyl-bonded silicas and polymers) and novel (restricted access materials (RAMs), molecularly imprinted synthetic polymers (MIPs), and immobilized receptors or antibodies (immunosorbents) materials. The biosensor technologies most frequently applied have been based on the use of antibodies and, to a lesser extent, enzymes, bacteria, receptors and DNA as recognition elements, and the use of optical and electrochemical transducing elements. Emerging contaminants investigated by means of these two techniques have included pharmaceuticals, endocrine disrupting compounds such as estrogens, alkylphenols and bisphenol A, pesticides transformation products, disinfection by-products, and bacterial toxins and mycotoxins, among others. Both techniques offer advantageous, and frequently comparable, features such as high sensitivity and selectivity, minimum sample manipulation, and automation. Biosensors are, in addition, relatively cheap and fast, which make them ideally suited for routine testing and screening of samples; however, in most cases, they can not compete yet with on-line SPE procedures in terms of accuracy, reproducibility, reliability (confirmation) of results, and capacity for multi-analyte determination.
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Affiliation(s)
- Sara Rodriguez-Mozaz
- Department of Environmental Chemistry, IIQAB-CSIC, C/Jordi Girona 18-26, 08034 Barcelona, Spain
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Chapter 2.8 Application of bioassays/biosensors for the analysis of pharmaceuticals in environmental samples. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s0166-526x(07)50009-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Rodriguez-Mozaz S, Lopez de Alda MJ, Barceló D. Biosensors as useful tools for environmental analysis and monitoring. Anal Bioanal Chem 2006; 386:1025-41. [PMID: 16807703 DOI: 10.1007/s00216-006-0574-3] [Citation(s) in RCA: 195] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2006] [Revised: 04/23/2006] [Accepted: 05/22/2006] [Indexed: 10/24/2022]
Abstract
Recent advances in the development and application of biosensors for environmental analysis and monitoring are reviewed in this article. Several examples of biosensors developed for relevant environmental pollutants and parameters are briefly overviewed. Special attention is paid to the application of biosensors to real environmental samples, taking into consideration aspects such as sample pretreatment, matrix effects and validation of biosensor measurements. Current trends in biosensor development are also considered and commented on in this work. In this context, nanotechnology, miniaturisation, multi-sensor array development and, especially, biotechnology arise as fast-growing areas that will have a marked influence on the development of new biosensing strategies in the near future.
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Affiliation(s)
- Sara Rodriguez-Mozaz
- Department of Environmental Chemistry, IIQAB-CSIC, C/ Jordi Girona 18-26, 08034, Barcelona, Spain.
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Samsonova ZV, Shchelokova OS, Ivanova NL, Rubtsova MY, Egorov AM. Enzyme-Linked Immunosorbent Assay of Ampicillin in Milk. APPL BIOCHEM MICRO+ 2005. [DOI: 10.1007/s10438-005-0107-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Terry LA, White SF, Tigwell LJ. The application of biosensors to fresh produce and the wider food industry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:1309-1316. [PMID: 15740000 DOI: 10.1021/jf040319t] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The inherent specificity, selectivity, and adaptability of biosensors make them ideal candidates for use throughout the food industry. Potential applications within the supply chain range from testing of foodstuffs for maximum pesticide residue verification through to the routine analysis of analyte(s) concentrations, such as, glucose, sucrose, alcohol, etc., which may be indicators of food quality/acceptability. Biosensor formats include simple "one-shot" disposable devices that can be used either in the field or integrated into more sophisticated laboratory instruments. Until now, the main impact of these devices has been in the medical diagnostics field. However, with ongoing technical development, the food industry will be one of the prime beneficiaries of biosensor technology in the future. This report assesses the current and future trends in the application of biosensors to fresh produce and the wider food industry, focusing on both potential and current target analytes that are fundamental to fresh produce quality, traceability, and safety.
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Affiliation(s)
- Leon A Terry
- The Institute of BioScience and Technology, Cranfield University, Silsoe, Bedfordshire, MK45 4DT, United Kingdom.
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Knecht BG, Strasser A, Dietrich R, Märtlbauer E, Niessner R, Weller MG. Automated Microarray System for the Simultaneous Detection of Antibiotics in Milk. Anal Chem 2003; 76:646-54. [PMID: 14750859 DOI: 10.1021/ac035028i] [Citation(s) in RCA: 209] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A parallel affinity sensor array (PASA) for the rapid automated analysis of 10 antibiotics in milk is presented, using multianalyte immunoassays with an indirect competitive ELISA format. Microscope glass slides modified with (3-glycidyloxypropyl)trimethoxysilane were used for the preparation of hapten microarrays. Protein conjugates of the haptens were immobilized as spots on disposable chips, which were processed in a flow cell. Monoclonal antibodies against penicillin G, cloxacillin, cephapirin, sulfadiazine, sulfamethazine, streptomycin, gentamicin, neomycin, erythromycin, and tylosin allowed the simultaneous detection of the respective analytes. Antibody binding was detected by a second antibody labeled with horseradish peroxidase generating enhanced chemiluminescence, which was recorded with a sensitive CCD camera. All liquid handling and sample processing was fully automated, and one analysis was carried out in milk within less than 5 min. The detection limits ranged from 0.12 (cephapirin) to 32 microg/L (neomycin). Penicillin G could be detected at the maximum residue limit (MRL); the detection limits for all other analytes were far below the respective MRLs. The PASA system proved to be the first immunochemical biosensor platform having the potential to test for numerous antibiotics in parallel, such being of considerable interest for the control of milk in the dairy industry.
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Affiliation(s)
- Bertram G Knecht
- Institute of Hydrochemistry, Technische Universität München, Marchioninistrasse 17, D-81377 Münich, Germany
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Vagin MY, Karyakina EE, Hianik T, Karyakin AA. Electrochemical transducers based on surfactant bilayers for the direct detection of affinity interactions. Biosens Bioelectron 2003; 18:1031-7. [PMID: 12782466 DOI: 10.1016/s0956-5663(02)00223-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The simple methods for the preparing of direct affinity sensors are proposed. The proposed method consists of the immobilizations of either oligonucleotide or antibodies as recognizing elements onto the surfactant bilayer. For DNA-sensor we propose to immobilize oligonucleotide by spontaneous infiltration of hydrocarbon chain bound to oligonucleotide pentadecathymidylate (dT(15)) into the hydrophobic region of surfactant bilayer. The adsorption of antibodies on bilayer surface has resulted in immunosensor development. The direct detection of affinity interactions in both cases has been investigated by impedance spectroscopy. At both studies the significant changes in impedance spectra have observed. The dynamics of response manifestation have been followed the specific DNA-coupling causing the decrease of real part of impedance, whereas the antibody-antigen interaction caused the increase of real part. The obtained results are promising for the development of impedimetric affinity sensors for clinical or environmental applications.
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Affiliation(s)
- Mikhail Yu Vagin
- Faculty of Chemistry, M.V. Lomonosov Moscow State University, 119899 Moscow, Russia
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Pemberton RM, Hart JP, Mottram TT. An electrochemical immunosensor for milk progesterone using a continuous flow system. Biosens Bioelectron 2001; 16:715-23. [PMID: 11679249 DOI: 10.1016/s0956-5663(01)00212-3] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
An electrochemical biosensor for cow's milk progesterone has been developed and used in a competitive immunoassay under thin-layer, continuous-flow conditions. Single-use biosensors were fabricated by depositing anti-progesterone monoclonal antibody (mAb) onto screen-printed carbon electrodes (SPCEs). Three operational steps could be identified: (1) Competitive binding of sample/conjugate (alkaline-phosphatase-labelled progesterone, AP-prog) mixture, (2) establishment of a steady-state amperometric baseline current and (3), measurement of an amperometric signal in the presence of enzyme substrate (1-naphthyl phosphate, 1-NP). In the thin-layer cell, the enzyme product, 1-naphthol, showed electrochemical behaviour consistent with bulk conditions and gave a linear amperometric response under continuous-flow conditions (E(app)=+0.3 V vs. Ag/AgCl) over the range 0.1-1.0 microg/ml. After pre-incubating biosensors with progesterone standards, signal generation within the cell (substrate concentration=5 mM) was recorded amperometrically as rate (nA/s) or maximum current (i(max), nA). Response values for milk standards were approximately 50% of those prepared in buffer. In both cases, calibration plots over the range 0-50 ng/ml progesterone were obtained. By conducting sample binding under flowing conditions, only 7% of the previous response was obtained, even at a substrate concentration of 50 mM, resulting in low signal:noise ratio. Using a stop-flow arrangement (i.e. quiescent sample binding, followed by continuous flow), low-noise amperograms were obtained at [1-NP]=5 mM. Calibration plots were obtained over the range 0-25 ng/ml, with a coefficient of variation of 12.5% for five replicate real milk samples.
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Affiliation(s)
- R M Pemberton
- Faculty of Applied Sciences, University of the West of England, Bristol BS16 1QY, UK
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