Plants produce many bioactive compounds that are called secondary metabolites, and have a wide variation in chemical diversity, distribution and function [1]. Phytochemistry of plants has revealed the pharmacological effect and their uses in industries [2-4]. Secondary metabolites have long been known as a source of effective medical therapies such as anti-bacterial and anti-cancer as reported ...

Plants produce many bioactive compounds that are called secondary metabolites, and have a wide variation in chemical diversity, distribution and function [1]. Phytochemistry of plants has revealed the pharmacological effect and their uses in industries [2-4]. Secondary metabolites have long been known as a source of effective medical therapies such as anti-bacterial and anti-cancer as reported ...

Legumes are an important source of protein in the diets. The presence of tannins, saponins, phytic acid and other antinutritional substances hinder their utilization in the human body. Tannins affect the availabilityof amino acids, utilization of protein and inhibit the activities of digestive enzymes. Soaking of legumes before cooking is a common practice to soften texture and hasten the cooki...

Plant tannins, including hydrolysable and condensed varieties, are well known antioxidants in medicinal plants, foods, and edible fruits. Their diverse biological properties and potential for disease prevention have been demonstrated by various in vitro and in vivo assays. A number of ellagitannins, the largest group of hydrolysable tannins, have been isolated from dicotyledoneous angiosperms a...

The effects on silage composition of ensiling perennial ryegrass (PRG) with three commercial tannins (mimosa, myrabolam and quebracho tannins) were assessed (Experiment 1). The effects on silage composition and mobile bag disappearance of DM, nitrogen and true protein of the addition of these tannins or a combination of tannin plus formic acid, formaldehyde alone, formic acid alone, or a combin...

The following tannins, Chinese gallotannin, 1,2,3,4,6-pentagalloyl glucose, chebulinic acid, procyanidin dimers, and procyanidin trimers were tested and found to be antagonists of seven gibberellins (GAs). Each tannin inhibited the growth induced by any of the gibberellins GA(1), GA(3), GA(4), GA(7), GA(9), GA(13), and GA(14) in the dwarf pea assay. Endogenous growth was not affected. The highe...

The tannins are natural polyphenols, able to precipitate water-soluble alkaloids and possess an inhibitory action on the angiotensin converting enzyme (ACE). We identified 18 polyphenolic compounds (tannins) from Chinese herbs and examined the in vitro effects of these tannins on ACE activity, including determination of the 50% inhibitory concentrations (IC50), specificity and mode of inhibitio...

This review of the current literature aims to study correlations between the chemical structure and gastric anti-ulcer activity of tannins. Tannins are used in medicine primarily because of their astringent properties. These properties are due to the fact that tannins react with the tissue proteins with which they come into contact. In gastric ulcers, this tannin-protein complex layer protects ...

The objective of the study was to determine seasonal variation in the concentration of tannins in wild bush tea (Athrixia phylicoides L.) leaves. The BuOH-HCl_Fe reagent was used to analyze condensed tannins, whereas hydrolysable tannin was analyzed using potassium iodate. The absorbance was measured using a spectrophotometer. Significant seasonal variations in both condensed and hydrolysable t...

Three commercial plant tannin and a yucca extract having different secondary compound profiles were simultaneously evaluated in vitro for their effects on ruminal methane gas production and rumen fermentation patterns of wheat forage. Overall objective was to quantify in vitro, the sources of tannins and dose levels of tannins and yucca extract on rate of gas production, ruminal fermentation, f...