Kinetics of the inhibition of ascorbic acid browning by sulphite
作者:
C. G. A. Davies,
B. L. Wedzicha,
期刊:
Food Additives & Contaminants
(Taylor Available online 1992)
卷期:
Volume 9,
issue 5
页码: 471-477
ISSN:0265-203X
年代: 1992
DOI:10.1080/02652039209374099
出版商: Taylor & Francis Group
关键词: ascorbic acid;vitamin C;sulphur dioxide;sulphite;gluconolactone;food additive;preservative;kinetics
数据来源: Taylor
摘要:
Despite differences in the structures of aldoses and ascorbic acid, ASA, the non‐enzymic browning of the latter involves intermediates similar to those found in Maillard browning. The kinetics of the sulphite‐inhibited browning of ASA suggest that, under anaerobic conditions, the rate of reaction of sulphite species, S(IV), is of first order with respect to S(IV). The possibility that S(IV) could catalyse the hydrolysis of the lactone ring of ASA is considered by reference to D‐glucono‐δ‐lactone. Evidence is presented to suggest that, under aerobic conditions, autoxidation of ASA leads to the oxidation of S(IV). The composition of melanoidins from ASA—glycine mixtures is compared with that from arabinose—glycine; the former contain 2.5 times more ASA‐derived residues per glycine molecule than arabinose‐derived residues per glycine molecule in the latter. The implications of these findings to the mechanism of ASA browning are discussed.
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