Journal
TETRAHEDRON LETTERS
Volume 44, Issue 41, Pages 7583-7587Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2003.08.065
Keywords
anthocyanins; pyranoanthocyanins; pinotin A; dimethylamino; cinnamic acid; CIELab
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Anthocyanins, isolated from natural sources by countercurrent chromatography, were reacted with cinnamic acids bearing at least one electron-donating substituent at the para-position. The resulting pyranoanthocyanins obtained by this simple one-step reaction were much less susceptible to pH shifts and retained their original colour over a wide pH-range. Through reaction with p-dimethylamino cinnamic acid, synthetic malvidin- and cyanidin-based anthocyanins with a unique violet hue were prepared. (C) 2003 Elsevier Ltd. All rights reserved.
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