Taeko Yasuhara

TL;DR: 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).

TL;DR: 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 electron spin resonance (ESR) measurements of the adducts formed by 5, 5-dimethyl-1-pyrroline-Noxide (DMPO) and the radical as discussed by the authors.

TL;DR: An anti-HIV (human immunodeficiency virus) phenolic constituent, licopyranocoumarin (4), and two other new phenolics named licoarylcou marin and glisoflavone were isolated from Si-pei licorice using droplet countercurrent chromatography and centrifugal partition chromatography, and their structures were assigned based on chemical and spectroscopic data.

TL;DR: Comparison of the inhibitory effect on XOD, with the binding activity to hemoglobin, for each tannin suggests that their inhibition of XOD is not based on non-specific binding to the protein, and that the inhibition of O2-.

TL;DR: Three new dimeric, monomeric and trimeric hydrolyzable tannins were isolated from the fruits of Cornus officinalis and their structures, including the orientation of the valoneoyl group in 1, were established on the basis of chemical and spectroscopic data.