Add time:08/18/2019         Source:sciencedirect.com

The electrophoretic mobility of an α-hydroxycarboxylic acid in electrolytes containing boric acid is very dependent on the degree of substitution at the α-carbon atom. A study of eighteen α-hydroxy acids shows clearly that the “gem-dialkyl” effect is operating to favour the formation of the strongly acidic boric acid complexes from the more densely substituted acids, the mobilities of whcih are thus more or less greatly enhanced.In general, the complexes from best at pH 2, but some are stable at higher levels. Of several that exist at pH 4.6, only the complexes of viridifloric, trachelanthic and lasiocarpic acids also survive paper electrophoresis at pH 9.2. These acids form 1:1 instead of the usual 1:2 complexes and they are further distinguished from the others by an unusually high degree of crowding at their α-carbons, and by containing a β- as well as the α-hydroxyl group.

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