期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 282, 期 5, 页码 1161-1168出版社
ACADEMIC PRESS INC
DOI: 10.1006/bbrc.2001.4705
关键词
flavonoid; hydroxycinnamate; anthocyanidin; catechin; ABTS radical cation; structure-activity relationship; antioxidant activity; TEAC
Rapid scavenging of the model stable radical cation, ABTS(.+) has been applied to screen for the antioxidant activity of flavonoids, The reaction follows two distinct phases. For compounds with a monophenolic B-ring there is a rapid initial phase of reduction of ABTS(.+) within 0.1 s with no further change in the subsequent 2.9 s, In contrast, compounds with a catechol-containing B ring follow a fast initial scavenging phase with a slow secondary phase. Flavonoids with an unsubstituted B ring do not react within this time scale. The findings suggest that the structure of the B ring is the primary determinant of the antioxidant activity of flavonoids when studied through fast reaction kinetics. (C) 2001 Academic Press.
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