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An immunoaffinity chromatographic method was developed for the purification of 9 sulfonamides (sulfamethazine, sulfadimethoxine, sulfamerazine, sulfathiazole, sulfamethoxazole, sulfamethizole, sulfadiazine, sulfamonomethoxine, and sulfapyridine) from chicken tissue (muscle and liver) samples. Two monoclonal antibodies (antisulfamethazine and antisulfamethoxazole) were simultaneously covalently coupled to CNBr-activated Sepharose 4B for the preparation of a re-usable immunoaffinity column. After extraction with methanolwater and purification by immunoaffinity column, the sulfonamides were determined by reversed-phase liquid chromatography and UV detection at 270 nm. The recoveries for each drug at fortification levels of 1050 ng/g ranged from 74.1 to 108.9 with relative standard deviations from 1.9 to 11.5. The limits of detection were 2 ng/g for each drug.

Purification of Nine Sulfonamides from Chicken Tissues by Immunoaffinity Chromatography Using Two Monoclonal Antibodies