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Two new flavonoids and other constituents in licorice root: their relative astringency and radical scavenging effects.
Four compounds, including two new flavonoids, were isolated from Si-pei licorice (licorice from the north-western region of China); Glycyrrhisoflavone was found to be one of the tannic substances by the measurement of the binding activity to hemoglobin (relative astringency).
Effects of the Interaction of Tannins with Co-existing Substances. VI. : Effects of Tannins and Related Polyphenols on Superoxide Anion Radical, and on 1, 1-Diphenyl-2-picrylhydrazyl Radical
The scavenging effects of twenty-five tannins including low-molecular polyphenols on the superoxide anion radical (O2-) generated in the hypoxanthine-xanthine oxidase system were estimated by
Tannins of Constant Structure in Medicinal and Food Plants—Hydrolyzable Tannins and Polyphenols Related to Tannins
In addition to the commonly used classification as hydrolyzable tannins and condensed tannins, tannins can also be categorized into two other types: polyphenols of constant chemical structure (Type
Antitumor Activity of Oenothein B, a Unique Macrocyclic Ellagitannin
Results suggest that oenothein B exerts its antitumor effect through potentiation of the host‐immune defense via activation of macrophages.
Inhibitory effects of various flavonoids isolated from leaves of persimmon on angiotensin-converting enzyme activity.
The results suggest that there is no relationship between the inhibition for angiotensin converting enzyme activity and the tannin activity for the four flavonoids.
Ellagitannins renewed the concept of tannins
1.1 Old and New Concepts of Tannins The pharmacological activities of tannins described in medicinal books before the recent achievements on ellagitannin chemistry were mostly those of gallotannins
Studies on Inhibition Mechanism of Autoxidation by Tannins and Flavonoids. V. Radical-Scavenging Effects of Tannins and Related Polyphenols on 1, 1-Diphenyl-2-picrylhydrazyl Radical
Radical scavenging effects of tannins and related polyphenols on 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical were evaluated by colorimetry. All of the polyphenols examined showed effects much
Anti-human immunodeficiency virus phenolics from licorice.
Five phenolics isolated from licorice inhibited the cytopathic activity of a human immmunodeficiency virus and one of these, a coumarin derivative named licopyranocoumarin, had structure 5, based on the chemical and spectroscopic evidence.