Excess crude protein (CP) in dairy cow diets is excreted mostly as urea nitrogen (N), which increases ammonia (NH) emissions from dairy farms and heightens human health and environmental concerns. Feeding less CP and more tannin to dairy cows may enhance feed N use and milk production, abate NH emissions, and conserve the fertilizer N value of manure. Lab-scale ventilated chambers were used to ...

Condensed tannins can be found in various parts of many plants. Unlike lignin there has been little study of their fate as they enter the soil organic matter pool and their influence on nutrient cycling, especially through their protein-binding properties. We extracted and characterized tannin-rich fractions from humus collected in 1998 from a black spruce [Picea mariana (Mill.) Britton et al.]...

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...

The aim of this study was to develop a preparation of a hydroalcoholic extract of Quercus infectoria in order to study the physicochemical parameters, and to identify and quantitatively determine the amount of Polyphenols and Tannin in the galls and in the extract. Preparation of an extract rich in Tannin from the galls of Quercus infectoria, as an astringent, can make incorporation into recta...

Ruminant animals raised in arid, semi-arid and mountainous regions in various parts of the world rely heavily on shrub and tree species as the main diet component. The presence of secondary compounds – mainly tannins – in a wide range of these plant species constrains their fodder potential. Tannins may cause toxicity when present in the hydrolysable (HT) form, and may reduce considerably the n...

BACKGROUND Sorghum types suitable for brewing and bioethanol production are required. The effect of sorghum type (white non-tannin versus white type II tannin) on free amino nitrogen (FAN) production from sorghum grain and malt using exogenous protease enzymes was investigated over extended incubation at moderate temperature (45 °C). RESULTS With grain in the absence of exogenous proteases, w...

Studies involving the kinetic reaction between vanillin and condensed tannins were developed using a flow injection system with spectrophotometric determination. A solution of the monomeric compound (-)-epicatechin was used as the analytical standard. This compound was chosen due to its structure, which is similar to a polymeric unit of the condensed tannin present in plants. The results indica...

The recent finding that grape tannin may contain significant amount of S-glutathionylated (GSH-3MH) and S-cysteinylated (Cys-3MH) precursors of the varietal thiols 3-mercapto-1-hexanol and 3-mercaptohexyl acetate, characteristic of Sauvignon blanc wines, offers new opportunities for enhancing the tropical aroma in fermented beverages. In this study this new hypothesis was investigated: Müller T...

Cornelian cherry (Cornus mas L.) has regained an increasing interest because of its nutraceutical and pharmaceutical potential. This study was designed to investigate the phenolic compounds (total phenolic, flavonoid, hydrolysable tannin, proanthocyanidin anthocyanidin) antioxidant capacity cherries. Some morphological (length, width, weight, flesh:seed ratio colour) physicochemical properties ...

Loblolly pine (Pinus tueda L) has become the most important source of wood fiber in the southern United States. This tree is an excellent competitor and recovers well from a variety of adverse conditions. ‘a2 The value of loblolly pine as a plantation tree has encouraged many researchers to devote their careers to the study of this species. It is surprising then that the root system of loblolly...