Sorghum (Sorghum bicolor L. Moench) is a native grass species of the arid and semi-arid regions of Africa (Kimber 2000). Sorghum is a genetically diverse crop and contains some genotypes that have a pigmented testa and therefore contain tannins (Rooney et al 1980; Rooney and Miller 1982). Such lines have the dominant B1_B2_ genes and are the only sorghum types with tannins (Blakeley et al 1979)...

The structures of the condensed tannins from leaf, stem bark and root bark of Acacia confusa were characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis, and their antioxidant activities were measured using 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging and ferric reducing/antioxidant power (FRAP) assays. The results s...

The effect of commercially available chestnut and mimosa tannins in vitro (experiment 1) or in vivo (experiment 2) on the growth or recovery of Escherichia coli O157:H7 or generic fecal E. coli was evaluated. In experiment 1, the mean growth rate of E. coli O157:H7, determined via the measurement of optical density at 600 nm during anaerobic culture in tryptic soy broth at 37 degrees C, was red...

CONTENTS INTRODUCTION . . 210 CHEMISTRY O F T A N N I N S . . . 210 OCCURRENCE O F T A N N I N S . . 211 G E N E R A L . . . 211 T A N N I N S IN CEREALS A N D LEGUME SEEDS . . 213 N A T U R A L FUNCTION O F T A N N I N S . . 215 T A N N I N ANALYSIS . . 215 COLORIMETRIC METHODS . . 215 Vanillin assay . . 215 Folin Denis assay . . 216 Prussian blue assay . . 216 Acid butanol assay . . 216 P R O...

Various tannin-complexing agents have been used to study the potential adverse effects of tannins on rumen metabolism. Using a method based on turbidity formation, the binding of various tannin-complexing agents (polyvinyl polypyrrolidone (PVPP), polyethylene glycol (PEG) of molecular weights 2000 to 35,000, and polyvinyl pyrrolidone (PVP) of molecular weight 10,000, 40,000 and 360,000) to tann...

The present study reports the effect of Emblica officinalis (EO) derived tannins on humoral immune responses and their protective efficacy against Eimeria infection in chickens. Tannins were extracted from EO and characterized by HPLC. EO derived tannins (EOT) and commercial tannins (CT) were orally administered in broiler chicks in graded doses for three consecutive days, that is, 5th-7th days...