Korean Journal of Veterinary Research 2006;46(3):291-294.
Application of a solid-phase fluorescence immunoassay to determine ampicillin residues in muscle tissue of olive flounder (Paralichthys olivaceus)
Won Chul Jung1, Ji Young Ha1, Hee Sik Chung2, Sung Hyeok Heo1, Suk Kim1, Hu Jang Lee1
1College of Veterinary Medicine, Gyeongsang National University
2Livestock Division, Gyeongnam Provincial Government
Abstract
$Parallux^{TM}$, a solid-phase fluorescence immunoassay(SPFIA) developed for antibiotics residue detection in milk, was applied for analysis of fish muscle. The recommended therapeutic dose of ampicillin(100 mg/kg body weight, withdrawal period 7 days) was orally administered to a group of 25 olive flounders(Paralichthys olivaceus) for consecutive five days. Muscle was sampled after drug treatment 1st, 2nd, 3rd, 4th and 5th day. The concentration of ampicillin in muscle, determined by SPFIA, was compared with that of internal standard(10 ppb as ampicillin). The absorbance ratio of sample to internal standard(Bs/Bo) was employed as an index to determine the muscle residue in olive flounder. To investigate the recovery rate, the standard solutions were added to muscle samples to give final concentrations in muscle of 10 and 50 ng/ml. The recovery rates of all spiked samples were > 89% of the spiked value. Ampicillin was detected in muscle of fishes treated until the 3rd day of withdrawal period. The present study showed that the SPFIA can be easily adopted in predicting tissue residues for ampicillin in farmed fishes.
Key Words: ampicillin, olive flounder, solid-phase fluorescence immunoassay


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