期刊
FOOD CHEMISTRY
卷 167, 期 -, 页码 52-60出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2014.06.086
关键词
Chlorogenic acid; Extraction; trans-5-CQA transformation; trans-5-CQA isomerisation; Transesterification; Phenolic acid
Chlorogenic acid (CQA), the ester of caffeic acid with quinic acid supplied to human organisms mainly with coffee, tea, fruit and vegetables, has been one of the most studied polyphenols. It is potentially useful in pharmaceuticals, food additives, and cosmetics due to its recently discovered biomedical activity, which revived interest in its properties, isomers and natural occurrence. We found that the heating of the alcoholic solution of trans-5-O-caffeoylquinic acid produced at least twenty compounds (chlorogenic acid derivatives and its reaction products with water and alcohol). The formation of three of them (methoxy, ethoxy and propoxy adducts) has not been reported yet. No reports exist either on methoxy adducts of 3- and 4-O-caffeoylquinic acid appearing in buffered methanol/water mixtures at pH exceeding 7. We observed that the amount of each formed component depended on the heating time, type of alcohol, its concentration in alcoholic/water mixture, and pH. (C) 2014 Elsevier Ltd. All rights reserved.
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