BACKGROUND Tannins are often cited for antinutritional effects, including chelation of non-heme iron. Despite this, studies exploring non-heme iron bioavailability inhibition with long-term consumption have reported mixed results. Salivary proline-rich proteins (PRPs) may mediate tannin-antinutritional effects on non-heme iron bioavailability. AIM To review evidence regarding biochemical bind...

We have shown that naturally occurring tannins possess antitumor promotion activity in mouse skin. In the present investigation, we studied the ability of a hydrolyzable tannin, gallotannin (GT), and a condensed tannin extracted from red alder (RA) bark to inhibit 1,2-dimethylhydrazine (DMH)-induced colonic aberrant crypt foci (ACF) and tumors in Balb/c mice. In addition, we determined the abil...

Using an in vitro cytotoxicity assay based on the release of 51Cr from cultured porcine thoracic aortic and pulmonary arterial endothelial cells, we have demonstrated that cotton bracts tannin is a potent endothelial cell cytotoxin. It produces dose-dependent lethal injury to both types of endothelial cells with the aortic cells being somewhat more sensitive to tannin-mediated injury than the p...

In order to establish the marker constituents of the natural antioxidant food-additive Eucalyptus leaf extract, the UV-absorbing constituents of two eucalyptus leaf extracts registered as food additives (eucalyptus A and B) were investigated. Several major peaks on the reversed-phase HPLC chromatogram of eucalyptus A were characterized as gallic acid, ellagic acid, 3-O-beta-D-glucuronides of qu...

Antibacterial activity of the Acetone, methanolic, ethanolic and DMSO extract of dried green microalgae Desmococcus olivaceous, chlorococcum humicola and chlorella vulgaris was assayed against five gram-ve (Klebsiella pneumoniae, Pseudomonas, Vibriocholerae, Streptococccus pyrogenes and Escherichia coli) and one gram +ve (Staphylococcus aureus) bacteria under culture conditions, using the agar ...

The present study was carried out to evaluate phytochemicals of pods of Leucaena leucocephala. The phytochemical analysis was performed using 50% ethanolic extracts of pods powder of Leucaena leucocephala. Quantitative analysis of phytochemicals like phenols, flavonoids and tannins was done. Phytochemical analysis revealed the presence of alkaloids, flavonoids, phenols, tannins, saponins, carbo...

Momordica charantia (MC) fruit was subjected to phytochemical and pharmacological interaction studies with oral hypoglycemis in NIDDM patients. Phytochemical, chromatographical analysis and extraction of methanolic MC fruit soft (semi-solid form) in CCl4 + C6H6 solvent system yielded 15 diverse chemical constituents--alkaloids, glycosides, aglycone, tannin, sterol, phenol and protein. The CCl4 ...

Tannin, isolated from cotton bracts, inhibits chloride secretion in airway epithelium. In bovine tracheal epithelial cells, tannin (25 μg/ml) blunted isoproterenol (Iso)-stimulated adenosine 3',5'-cyclic monophosphate (cAMP) accumulation. Inhibition was time and dose dependent, with 52 ± 5% (mean ± SE, n = 6) inhibition at 60 min and 82 ± 9% ( n = 3) inhibition at 8 h. Inhibition was reversible...

Tannin polyphenols are produced by plants to protect themselves against natural decay. It is expected that impregnating low-durable timber with tannin extracts of more durable species such as quebracho (Schinopsis balansae) will enhance the durability specimens. This biomimetic approach combined in situ polymerization quebracho–hexamine formulations can be a valid alternative synthetic wood pre...

It is demonstrated that the combined addition to a culture of aqueous extracts from tannin pharmacopoeial raw materials, containing elladic acid (Cortex Quercus, Folium Uvae ursi and Rhizoma Tormentillae) and the antibiotics: cefuroxime, cefoperazone and doxycycline influences the enhancement of survival of mouse thymocytes in cultures with supplementation of hydrocortisone. A cytotoxic test wa...