The stereospecificity of the decarboxylase and ethyl esterase of D. bruxellensis was evaluated by submitting cis- and trans-hydroxycinnamic acids and cis-ethyl hydroxycinnamates to fermentations with D. bruxellensis AWRI 1499. Metabolism of the hydroxycinnamates was preferential for the trans-analogues, and showed that the cis-isomers are unimportant in the accumulation of ethylphenol off-flavor in wine.
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