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...

Seven new monoterpene glycoside esters related to paeoniflorin were isolated from Paeoniae Radix, together with polymeric proanthocyanidins, polygalloylglucoses and 48 known compounds (a benzoylsucrose, seven aromatic acids, adenosine, nine monoterpene glycosides, eight flavan-3-ols, a catechin dimer formed by oxidation, seven proanthocyanidins, three galloylsucroses, five galloylglucoses, and ...

Condensed tannins are short polymers of flavan-3-ols found in grapes (also known as proanthocyanidins). An investigation on the electrochemical oxidation grapevine proanthocyanidins (PAs) glassy carbon electrodes under various conditions was conducted for first time. To study how were oxidized, square-wave and cyclic voltammetry used. There is a predominant peak associated with extract proantho...

The study of phenolic maturity in Vitis vinifera L. requires a multidisciplinary approach to understand how the evolution berry flavonoids and cell wall material influence colour textures red wine. This is challenging issue which involves researchers viticulture enology, results their work are particular interest for producers high-quality wines. review reports current knowledge regarding matur...

Persimmon fruits accumulate proanthocyanidins during development. Proanthocyanidins form insoluble complexes with saliva proteins, which promote a sensation of dryness in the mouth called astringency. cultivars are classified according to pollination and presence astringency at harvest. The different characteristics between persimmon lead metabolic pathways for loss aim this review is gather in...

In this article, we calculate various topological invariants such as symmetric division degree index, redefined Zagreb VL first and second exponential multiplicative indices, entropy, entropies, entropy. We take the chemical compound named Proanthocyanidins, which is a very useful polyphenol in human’s diet. They are beneficial for one’s health. These compounds extracted from grape seeds. treme...

Proanthocyanidins (PA) (condensed tannins) and hydrolyzable tannins (HT) are the two major classes of tannins. Proanthocyanidins are flavonoid polymers. Hydrolyzable tannins are polymers of gallic or ellagic acid esterified to a core molecule, commonly glucose or a polyphenol such as catechin. Proanthocyanidins are the most common type of tannin found in forage legumes. Problems in the analysis...