Khandelwal GD, Rimmer YL, Wedzicha BL. Reaction of sorbic acid in wheat flour doughs: reaction with thiols.
FOOD ADDITIVES AND CONTAMINANTS 1992;
9:493-7. [PMID:
1298654 DOI:
10.1080/02652039209374102]
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Abstract
The general characteristics of the reaction between sorbic acid and thiols are reviewed. Cysteine adds to the conjugated diene in position 5 to form the substituted 3-hexenoic acid. This is labile in acid solution, yielding a quantitative amount of sorbic acid. When wheat flour doughs are treated with sorbic acid and heated, a significant amount of the sorbic acid is not recovered on extraction with methanol. The use of acidified methanol leads to a quantitative recovery of the preservation and evidence is presented to suggest that sorbic acid-thiol adducts are formed. This is the first report of 'reversibly bound' sorbic acid in a food.
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