Application of a solid-phase fluorescence immunoassay to determine neomycin residues in muscle tissue of olive flounder (Paralichthys olivaceus), rockfish (Sebastes schlegeli), and red sea bream (Pagrus major)

Jung, Won Chul; Chung, Hee Sik; Shon, Ho Yeong; Lee, Hu-Jang

Korean Journal of Veterinary Research 2008;48(2):175-179.

Won Chul Jung¹, Hee Sik Chung², Ho Yeong Shon³, Hu-Jang Lee¹

¹Research Institute of Life Sciences, College of Veterinary Medicine, Gyeongsang National University
²Hapcheon Country Office
³Agricultural Technology Center, Yangsan City Hall

Abstract

Parallux, a solid-phase fluorescence immunoassay (SPFIA) developed for detection antibiotics residue in milk, was applied for analysis of antibiotics in muscle tissue of olive flounder (Paralichthys olivaceus), rockfish (Sebastes schlegeli), and red sea bream (Pagrus major). Fishes were dipped in neomycin 140 mg/ton water, the recommended therapeutic dose, for 24 h. Muscle samples were obtained on 1st, 2nd, 3rd, 4th and 5th day after drug treatment. The concentration of neomycin in muscle was determined using an internal standard (100 ppb as neomycin). The absorbance ratio of sample to internal standard (S/C) was employed as an index to determine the muscle residues in fishes. To investigate the recovery rate, the standard solutions were added to muscle samples to give final concentrations in muscle of 0.2 and 0.5 mg/ml. The recovery rates of all spiked samples were > 85% of the spiked value. Neomycin was detected in muscles of fishes treated after the 1st day of withdrawal period. On the 2nd day after drug treatment, all muscle samples showed negative reaction (S/C ration ${leq}$ 1.0). The present study showed that the SPFIA can be applied for predicting residues of neomycin in muscle tissues of farmed fishes.

Key Words: neomycin, olive flounder, red sea bream, rockfish, solid-phase fluorescence immunoassay