Tannin is a very versatile industrial material found in many parts of plants such as the bark of Eucalyptus camadulensis (EC). The bark of EC that normally peels off during the dry season has usually served as anxious substrate for pathogens. In the present experiment, tannin was leached from the bark of EC using water as solvent. Tannin produced varied from 5 to 12%. The yield obtained was fou...

Tannin-rich legume forages have nutraceutical value for ruminants through slowing down the infections with parasitic nematodes of the gastro intestinal tract. This review aims to describe the effects of tannin-containing legumes on the various nematode stages We will also discuss the sources of variability in results and present the current hypotheses in regard to the possible modes of action o...

The gene expression profiles of Escherichia coli strains grown anaerobically with or without Acacia mearnsii (black wattle) extract were compared to identify tannin resistance strategies. The cell envelope stress protein gene spy and the multidrug transporter-encoding operon mdtABCD, both under the control of the BaeSR two-component regulatory system, were significantly up-regulated in the pres...

• Tannins are the main class of polyphenolic compounds thought to contribute to astringency. The Harbertson/Adams assay allows for the measurement of the various phenolic fractions in a wine: tannin, large polymeric pigment (LPP), small polymeric pigment (SPP), and anthocyanin (see Summaries #4 and #28). The goal of these authors was to explore the relationship between perceived astringency and...

This Application Note describes both HPLC and UHPLC methods to simultaneously separate and identify seven tannin compounds as aging markers in barrel-aged alcoholic beverages. The proposed methodology was applied to four different matrixes: whisky, brandy, rum, and tequila, to demonstrate a correlation between aging time and total tannin concentration level. Such a methodology could easily lead...

BACKGROUND The abolition of in-feed antibiotics or chemotherapeutics as growth promoters have stimulated the swine industry to look for alternatives such as organic acids, botanicals, probiotics and tannin. The objective of the present study was to compare the effects of a combination of acids and tannin with diet with organic acids and diet without growth promoters on the growth performance an...

Multiple experiments were conducted with a mammalian herbivore to determine how experience with plant secondary metabolites (terpenes and tannins) influenced acquisition of new aversions to diets containing these same plant metabolites. Goats (Capra aegagrus hircus) were employed as behavioral models for this study. Twenty-four subjects were assigned to three treatment groups that received 20 d...

Feeding of sorghum with a high level of tannin (high-tannin sorghum) to rats caused changes in gene expression in parotid glands similar to isoproterenol treatment. Within 3 days the parotid glands were enlarged about 3-fold and a series of proline-rich proteins were increased about 12-fold. Unlike isoproterenol treatment, no changes were observed in the submandibular glands, and a Mr 220,000 g...

Tannins are plant-derived polyphenols with antimicrobial effects. The mechanism of tannin toxicity towards Escherichia coli was determined by using an extract from Acacia mearnsii (Black wattle) as a source of condensed tannins (proanthocyanidins). E. coli growth was inhibited by tannins only when tannins were exposed to oxygen. Tannins auto-oxidize, and substantial hydrogen peroxide was genera...

Tannins, an abundant group of plant secondary compounds, raise interest in different fields of science, owing to their unique chemical characteristics. In chemical ecology, tannins play a crucial role in plant defense against pathogens, herbivores, and changing environmental conditions. In the food industry and in medicine, tannins are important because of their proven positive effect on human ...