Abstract
Abstract Aflatoxin B1, B2, G1, and G2 primary standards were stored in benzene and chloroform solutions for 1 year at 28 and –18°C. Storage at either temperature produced only minor changes in molar absorptivity; the decreases ranged from 0.5 to 2.9% and averaged 1.9% at 28°C and ranged from 0.3 to 1.4% and averaged 1.0% at –18°C. Solution fluorescence KQ showed a greater decrease; it ranged from 8 to 22% and averaged 15% at 28°C and ranged from 7 to 19% and averaged 14% at –18°C. Thin layer chromatography of standards stored 1 year showed a single spot for each aflatoxin and the absence of any other fluorescent derivatives.
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