Abstract
AbstractThe formation of complexes between thiamine disulfide (TDS) orO‐acetyl thiamine disulfide (O‐acetyl TDS) and fatty acid or fatty acid methyl ester in methanol has been studied by fluorescence quenching and13C NMR relaxation (T1) measurements. The association constants (K‐values) of TDS andO‐acetyl TDS with fatty acids (from 11∶0 to 18∶0, and 18∶1, 18∶2, 18∶3 and 20∶4) and fatty acid methyl esters have been determined. These values do not depend on either the number of carbon atoms or the degree of unsaturation of the fatty acid. The K‐values of TDS andO‐acetyl TDS with fatty acid were 7.8 M−1 and 5.1 M−1, respectively. The K‐values of TDS andO‐acetyl TDS with fatty acid methyl ester were very small. These results show that the‐OH moiety in TDS and the‐COOH moiety in the fatty acid are necessary for formation of the complex
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