T. Okuda

Publications353
h-index56
Citations12,473
Highly Influential Citations282
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Two new flavonoids and other constituents in licorice root: their relative astringency and radical scavenging effects.
TLDR
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…
Systematics and health effects of chemically distinct tannins in medicinal plants.
  • T. Okuda
  • Chemistry, Biology
    Phytochemistry
  • 1 September 2005
Antitumor Activity of Oenothein B, a Unique Macrocyclic Ellagitannin
TLDR
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.
TLDR
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…
Chemotaxonomic studies of rubiaceous plants containing iridoid Glycosides
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.
TLDR
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.
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