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¹ Laboratory of Food Safety, Department of Sciences for Living, Aichi Konan College, Konan, Aichi 483-8086, Japan
² Yaizu Suisankagaku Industry Co., LTD., Yaizu, Shizuoka 425-8570, Japan
³ Chanthaburi Coastal Fisheries Research and Development Center, Bangkaja, Muang Chanthaburi 22000, Thailand
⁴ Department of Fisheries, Ministry of Agriculture and Cooperative, Chatuchak, Bangkok 10900, Thailand DOI : 10.4194/1303-2712-v12_1_11 Viewed : 4032 - Downloaded : 4732 The present study examined the influences of industrial chitin extraction processes on the residual oxytetracycline (OTC) and oxolinic acid (OA) in shrimp carapaces and shells. The drugs were orally administered by catheter to the kuruma shrimp (Penaeus japonicus) and vannamei shrimp (Penaeus vannamei). The shrimps were sampled at 6-h post-dosing and their carapaces and shells were collected and used as raw material in the chitin extraction. Residual OTC levels in raw materials were 9 – 18 fold higher than the maximum residue limit (MRL) (0.2 μg/g). The residual OTC was reduced 10 – 30% by washing treatment. By the acid treatment with HCl, the OTC residues were reduced >98%. The deproteinized material contained negligible levels of OTC. Residual OA levels in raw materials was much higher (134 – 376 fold) than the MRL (0.03 μg/g). The residual OA was reduced considerably (34 – 68%) by washing treatment. By the demineralization, the residual OA could not be detected in both shrimp carapaces, while the levels of OA residues were determined more than MRL in shells. In the deproteinized materials, no residual OA were detected. Finally, residual OTC and OA could not be detected in the chitin materials for both shrimps. Keywords : Oxytetracycline, oxolinic acid, shrimp, chitin, drug residues