Abstract
A simple, sensitive, and accurate TLC method was combined and validated for a simultaneous limit test of streptomycin sulfate and kanamycin sulfate residues in fresh fish meat. The optimum mobile phase was 10% potassium dihydrogen phosphate. TLC-contact bioautography used Staphylococcus aureus ATCC 29737 as a test organism. For TLC-densitometry, analyte spots were detected using 1% w/v ninhydrin in ethanol and maximum absorbance at 400 nm. TLC-contact bioautography and TLC-densitometry methods were validated according to USP guidelines for the limit test with respect to selectivity and limit of detection (LOD) added with the accuracy of a recovery test of streptomycin sulfate and kanamycin sulfate in fresh fish samples was developed and validated. The result of LOD from the TLC-contact bioautography method for streptomycin sulfate and kanamycin sulfate were obtained 0.7028 μg and 0.8032 μg, respectively. Meanwhile, LOD of the TLC-densitometry method for streptomycin sulfate and kanamycin sulfate were obtained 0.0631 μg and 0.0685 μg, respectively. In this study, TLC-contact bioautography method showed better results than TLC-densitometry. TLC-contact bioautography appears a good choice for the simultaneous limit test of streptomycin sulfate and kanamycin sulfate residues in fresh fish samples.
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