title: Validation of a two-plate microbiological method for screening antibiotic residues in shrimp tissue.
abstract: Microbiological inhibition screening tests could play an important role to detect residues of antibiotics in the different animal food products, but very few are available for the aquaculture products in general, and for shrimps in particular. A two-plate microbiological method to screen shrimp for residues of the most commonly used antibiotics has been developed and validated according to criteria derived from the European Commission Decision 2002/657/CE. Bacillus subtilis was used as a sensitive strain to target antibiotics. Culture conditions on Petri plates (pH of medium) were selected to enhance the capacity of antibiotic detection. Antibiotic residues were extracted from shrimps using acetonitrile/acetone (70/30, v/v) before application on Petri plates seeded with B. subtilis. The method was validated using spiked blank tissues as well as antibiotic treated shrimps with enrofloxacin and tetracycline, two antibiotics often found to be used in shrimp production. For tetracyclines and (fluoro)quinolones, the detection capability was below the maximum residue limit (MRL), while it was around the MRL for sulfonamides. The specificity of the microbiological screening was 100% in all cases while the sensitivity and accuracy was 100% in almost all cases. The capacity of the method to detect contaminated samples was confirmed on antibiotic treated shrimps, analyzed in parallel with a confirmatory method (Liquid Chromatography coupled to mass spectrometry (LC-MS)).
authors.affiliation: Faculty of Animal Sciences & Aquaculture, Hanoi University of Agriculture, Gialam, Hanoi, Viet Nam.
authors.forename: Pham Kim
authors.initials: PK
authors.lastname: Dang
authors.forename: Guy
authors.initials: G
authors.lastname: Degand
authors.forename: Sophie
authors.initials: S
authors.lastname: Danyi
authors.forename: Gilles
authors.initials: G
authors.lastname: Pierret
authors.forename: Philippe
authors.initials: P
authors.lastname: Delahaut
authors.forename: Vu Dinh
authors.initials: VD
authors.lastname: Ton
authors.forename: Guy
authors.initials: G
authors.lastname: Maghuin-Rogister
authors.forename: Marie-Louise
authors.initials: ML
authors.lastname: Scippo
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis* / Q000494:pharmacology; D001412:Bacillus subtilis / Q000187:drug effects; D004350:Drug Residues / Q000032:analysis* / Q000494:pharmacology; D005506:Food Contamination / Q000032:analysis*; D008826:Microbial Sensitivity Tests / Q000379:methods*; D033541:Palaemonidae / Q000737:chemistry*; D012680:Sensitivity and Specificity
chemical_list: D000900:Anti-Bacterial Agents