Abstract
Abstract Dolinsky and Stein described the use of a liquid anion exchange resin in butanol to extract FD&C colors from baked goods. The experience gained in our laboratory from analysis of over 450 food samples and more than 250 drug and vitamin samples by this procedure led to the development of several modifications of the original method. Solutions of the resin in hexane are employed to separate the azo colors from the triphenylmethane colors. For certain colors, a buffered resin solution is employed to minimize decomposition. The modification of the procedure to be employed depends primarily upon the color or colors present rather than upon the product to be analyzed. The applications of these procedures and their limitations in the analysis of foods and drugs for certifiable colors are discussed.
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