Abstract
The residue depletion of albendazole (ABZ) and its metabolites was studied in channel catfish muscle tissue. Channel catfish were dosed once with 10 mg/kg ABZ via stomach tube with manual restraint. Muscle tissue samples were collected at 8, 16, 24, 48, 72, 96 and 120 h postdose. A high-performance liquid chromatographic method was used to assay ABZ and its major metabolites: ABZ sulfoxide (ABZ-SO), ABZ sulfone (ABZ-SO2) and ABZ aminosulfone (ABZ-2-NH2SO2) in the muscle tissue. The results indicate that ABZ and ABZ-SO were present in low concentrations, i.e. <15 and <10 microg/kg, respectively, at 8 h postdose in catfish muscle with and without skin. ABZ-SO2 was present at 1 microg/kg concentration levels until 48 h in muscle alone and 72 h in muscle with skin. ABZ-2-NH2SO2 was not detected at any withdrawal periods.
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