Journal
JOURNAL OF NATURAL PRODUCTS
Volume 71, Issue 1, Pages 76-80Publisher
AMER CHEMICAL SOC
DOI: 10.1021/np070438d
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The ratio of isothiocyanates to nitriles formed upon the hydrolysis of glucosinolates is a key factor determining the physiological effect of glucosinolate-containing plants and materials. A micellar electrokinetic capillary chromatography (MECC) method was used to study the nonenzymatic Fe2+-catalyzed transformation of glucosinolates. At room temperature, pH 5, and in the presence of only 2 molar excess of Fe2+ all glucosinolate was degraded in 24 h. At all molar excess Fe2+ tested, nitriles were the major compounds formed. Thionamides were also formed from glucosinolates that contained a side chain hydroxylated at C-2; in this case, trace amounts of oxazolidine-2-thione were also detected. The presence of Fe3+ had no effect. The nonenzymatic Fe2+-catalyzed transformation of glucosinolates involves the binding of Fe2+ to the glucosinolate to form a complex.
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