Yellow tea is more potent than other types of tea in suppressing liver toxicity induced by carbon tetrachloride in rats

Abstract

The present study compared the effects of six Chinese teas categorized by their production process: green, white, yellow, oolong, black and pu-erh teas, on carbon tetrachloride (CCl4)-induced liver injury. Wistar rats were given ad libitum the Chinese teas prepared according to the home-style methods for 1 week, and then intraperitoneally injected with CCl4 (1 mg/kg body weight) or olive oil as a vehicle. The yellow tea significantly ameliorated the increase in the activity of the alanine- and aspartate-aminotransferases in plasma. Thus, the drinking of yellow tea may contribute to protection against liver injury.

Protective effect of yellow tea extract on N-nitrosodiethylamine-induced liver carcinogenesis

“…These results strongly confirm the antioxidant action of the phenolic compounds of yellow tea in the in vivo model. Yellow tea, as compared with other types of tea, contains the highest amount of gallic acid and catechin derivatives (Hashimoto et al 2007). Gallic acid has been reported to possess strong antioxidant, anti-inflammatory, antimutagenic and anticancer properties (Vijaya Padma et al 2011).…”

“…Tea, an infusion from Camellia sinensis (L.) Kuntze (Theaceae) leaves, is the most widely consumed beverage, after water. On the basis of different manufacturing processes, tea is classified into six categories: green, white, yellow, oolong, black and pu-erh (Hashimoto et al 2007). Yellow tea is processed similar to green tea by heating the leaves to stop fermentation.…”

“…On the other hand, the content of (À) epigallocatechin (EGC) and (À) epigallocatechin-3-gallate (EGCG) is over two times higher in green tea than in yellow tea (Gramza-Michałowska 2007). Moreover, yellow tea contains 10 times more gallic acid than green tea (Hashimoto et al 2007). In the last decade, much effort has been put into studying the mechanisms involved in the chemopreventive effects of tea polyphenols.…”

“…Hashimoto et al (2007) reported that yellow tea showed more significant hepatoprotective activity against CCl 4 -induced hepatic injury in rats in comparison with other types of tea, including green tea. Wang et al (2013) showed the protective effect of yellow tea against ethanol-induced gastric mucosal injury in rats, which appeared to be related to a decrease in the serum level of proinflammatory cytokines IL-6 and TNFa.…”

A Novel Dietary Supplement Containing Multiple Phytochemicals and Vitamins Elevates Hepatorenal and Cardiac Antioxidant Enzymes in the Absence of Significant Serum Chemistry and Genomic Changes

“…The combined effect of the polyphenolic component (EGCG) and caffeine has been theorized to be due to an inhibitory action on the enzyme catechol- O -methyl transferase which inactivates catecholamines 33,34. Overall, various tea components are deemed beneficial for the liver28,35 and cardiovascular health 36,37…”