Studies on Tannins. II

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 A) and polyphenols of variable composition (Type B). Both types of tannins and related polyphenols account for a large part of plant polyphenols, but accurate structure-activity correlations on a mol...

Does Propolis Contain Tannins?

Although polyphenols have been reported as common constituents of propolis, tannins have rarely been mentioned as its constituents. Propolis samples from seven localities in Brazil were analyzed for detection of proanthocyanidins (condensed tannins) and determination of the tannin content. Positive reaction for proanthocyanidins was observed for all samples tested. The contents of tannins varie...

Studies on Echinococcosis : Ii. Echinococcosis in Japan

Further Studies on Bacterial Hypersusceptibility. Ii

When filtered alkaline extracts of pulverized bacteria of several varieties are precipitated with acid in the cold, boiled with acid, and all materials thrown down by these procedures removed, there remains a small amount of an alcohol-precipitable material which no longer gives any of the ordinary chemical reactions for proteins, such as the biuret, Hopkins-Cole, Millon, and sulfosalicylic aci...

Studies on erythropoietic action of angiotensin II.

S INCE THE ESTABLISHMENT of a concept that erythropoiesis is controlled by erythropoietin (Ep), search for the production site of Ep has been one of the major projects. From the results obtained from both clinical and experimental research carried out so far, the kidney has been regarded as the organ playing an important role in the production of Ep. However, the mechanism of the production is ...