期刊名称：Polish Journal of Food and Nutrition Sciences
印刷版ISSN：1230-0322
电子版ISSN：2083-6007
出版年度：2020
卷号：70
期号：1
页码：7-14
DOI：10.31883/pjfns/114897
出版社：Walter de Gruyter GmbH
摘要：Betalains are one of the most common groups of plant pigments found in nature, especially in red beetroot (Beta vulgaris L.) which is the main commercially exploited source of betalains produced in the form of concentrates or powders. This report presents results of thermal decarboxylation studies on betacyanins present in a specifi cally purifi ed highly concentrated betalain-rich extract (BRE). The fi rst tentative structures formed by decarboxylation of the main pigment present in BRE, betanin and its diastereomer, were established by means of liquid chromatography coupled to diode array detection and electrospray ionization tandem mass spectrometry (LC-DAD-ESI-MS/MS). In the extract, two new isomeric bidecarboxylated betanins were tentatively identifi ed. A high rate of generation of 2-decarboxy-betanin/-isobetanin which are present in the BRE extract at very low level was observed, which was dependent on the starting concentration of the BRE substrate. The bidecarboxylated derivatives were generated at a higher rate mostly from 17-decarboxy-betanin/-isobetanin as well as 15-decarboxy-betanin by further decarboxylation at carbon C-2. Further studies will be performed to demonstrate if the decarboxylated betanins being products of heating B. vulgaris preparations can be used for various food applications with new health-promoting actions and colorant properties.
关键词：decarboxylation; red beet root; colorants; betanin; betalain-rich extract; decarboxy-betacyanins
