Screening method for the detection of a range of nitrofurans in avian eyes by optical biosensor |
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Authors: | Thompson Colin S Traynor Imelda M Fodey Terence L Crooks Steven R H Kennedy D Glenn |
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Institution: | Agri-Food and Biosciences Institute, Veterinary Sciences Division, Stormont, Belfast, Northern Ireland, UK. colin.thompson@afbini.gov.uk |
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Abstract: | An immunobiosensor assay was developed for the multi-residue screening of a range of nitrofuran compounds in avian eyes. A polyclonal antibody which binds at least 5 of the major parent nitrofurans was raised in a rabbit after inoculation with a nitrofuran mimic-protein conjugate. Sample homogenates were extracted into 0.1M hydrochloric acid and subjected to clean-up by solid phase extraction and micro-centrifugation prior to biosensor analysis. Validation data obtained from the analysis of 21 fortified samples has shown that the method has a detection capability (CCβ) of less than 1 ng eye(-1) for nitrofurazone (NFZ). In addition, cross-reactivity data and the analysis of a smaller number of fortified samples have shown that the method will also detect a range of other major parent nitrofurans including furazolidone (FZD), furaltadone (FTD), nitrofurantoin (NFA) and nifursol (NFS). Intra-assay variation (n=10) was calculated at 12.9% and 10.1% at concentrations of 1 ng eye(-1) and 2 ng eye(-1) NFZ respectively. Inter-assay variation (n=3) was determined to be 10.8% and 4.7% at the same NFZ concentrations respectively. The cross-reactivity profile and validation data for the detection of these nitrofurans are presented together with the results obtained following the analysis of a small number of incurred samples using the developed method. |
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