Effect of green tea (Camellia sinensis) polyphenol on blood antioxydant status in rats with streptozocin-induced diabetes

The diabetic patients are usually suffered from oxidation stress. Green tea is one of the good herbal medicines has been used for treatment of some diseases. Objectives: Evaluate change of antioxidant status in blood and effect of the green tea polyphenol on this change in the experimental diabetic rats. Methods: Using in vivo model to investigate some biological indicators in STZ - induced diabetic rats fed with high fat diet and to evaluate effect of the green tea polyphenol on the changes of these indicators. Results: Erythrocyte GPx activity and serum MDA concentration in STZ - induced diabetic rats was higher than that of normal and lipid metabolism disorder groups (p < 0.001) and effected of the green tea polyphenol. However, no change in erythrocyte SOD activity and plasma TAS level was observed. Conclusions: Green tea polyphenol improved blood antioxidant status in STZ - induced diabetic rats.

Effect of green tea extract on lipid peroxydation and aortic atherosclerosis in cholesterol-fed rabbits

Green tea is one of the most widely consumed beverages in Vietnam. Polyphenol in green tea possess biological effects such as antitumoral, anticarciogenic, anti-inflammatory and reduce the risk of cardiovascular disease by increasing the plasma antioxidative capacity in human. Lipid peroxidation and oxidative modification of low-density lipoprotein have been implicated in human atherosclersis. Green tea extract with doses of 100 mg, 150 mg/kg body weight/day reduced levels of MDA plasma and injury of aortic atherosclerosis

Effects of Vietnamese green tea extract on lipid metabolism in rabit drinked cholesterol

Green tea extract decreased lipid metabolism disorders on rabbit consuming cholesterol in experiment through the improvement of plasma TG, TC, LDL-C level. This effect depends on the doses of cholesterol and the drinking periods. The dose of 150mg/kg/day gave best effect.