Abstract
A new fluorimetric method for determination of sulfonamides was described based on the formation of a fluorescent inclusion complex of carbonic anhydrase(CAI with dansylamide(DNSA). The binding of DNSA to CA resulted in an enhancement in the fluorescence emission at 460 nrn with excitation at 280 nrn. Dissociation constants were determined for the carbonic anhydrase-sulfonamide complexes. Linear calibration graphs of sulfonamides were obtained within a concentration range of 0–0.058 μg/mL for DNSA; 0–0.344 pg/mL for sulfanilamide (SAN) and 0–0.286 μg/mL forP-toluene-sulfonamide (PTSN). The relative standard deviations were within 1.8%-4.2%. Limits of detection for DNSA, SAN and PTSN were 0.84, 19. 5 and 6.1 ng/mL, respectively. The method was applied to the determination of sulfonamides in cow milk at ng/mL level.
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Li, H., Ci, Y. Determination of sulfonamides with fluorescent inclusion complex of carbonic anhydrase and dansylamide. Chin.Sci.Bull. 43, 1085–1090 (1998). https://doi.org/10.1007/BF02883078
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DOI: https://doi.org/10.1007/BF02883078