the nutritive value of grass pea (lathyrus sativus l.) hay was evaluated based on its chemical composition, gas production, fractioning of protein in cncps and afrc systems, metabolizable energy (me), rumen degradability through in situ technique and in vitro digestibility through tilley and terry method. the crude protein (cp), neutral detergent fiber (ndf) and acid detergent fiber (adf) value...

Ultrasonic technology and response surface methodology (RSM) wereused for optimization of extraction of condensed tannins from the leaf, acron, gland and gall of oak. Three independent variables such as solvent percentage (%), temperature (°C) and time (min) were studied. Effect of methanol concentration was found to be significant on all responses. Optimal ultrasonicassisted extraction (UAE) c...

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...

Fresh fruits are rich sources of polyphenolic compounds. The polyphenolics present in plant sources are known to have beneficial effects, especially in the prevention of cardio-vascular diseases, cancer, etc. Therefore, the consumption of fresh fruits is not only associated with vitamin supplementation, but also serves as an effective preventive agent for many diseases. The polyphenolic compoun...

The structures of condensed tannins isolated from two mangrove species, Kandelia candel and Rhizophora mangle, were characterized by 13C nuclear magnetic resonance (NMR) spectroscopy and matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analyses. Results demonstrate that large heterogeneity occurs in degree of polymerization, pattern of hydroxylation, a...

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The tannins are polyphenolic compounds with complex structures formed by the secondary metabolism in various plants. Among the oldest applications of tannins is leather tanning. Tanning properties are due to the ability of these polyphenols to form complexes with proteins. In this study were analysed six different types of commercially polyphenolic extracts by Fourier transform infrared spectro...