Antioxidative Effects of Black Tea Theaflavins and Thearubigin on Lipid Peroxidation of Rat Liver Homogenates Induced by tert-Butyl Hydroperoxide

• Published in: Biological & pharmaceutical bulletin Vol. 17; no. 1; pp. 146 - 149
• Main Authors: SANO, Mitsuaki, HARA, Yukihiko, YOSHINO, Kyoji, TOMITA, Isao
• Format: Journal Article
• Language: English
• Published: Tokyo The Pharmaceutical Society of Japan 01.01.1994; Maruzen; Japan Science and Technology Agency
• Subjects: Animals; antioxidant; Antioxidants - pharmacology; Biflavonoids; Biological and medical sciences; Catechin - analogs & derivatives; Catechin - pharmacology; Chromatography, High Pressure Liquid; Dose-Response Relationship, Drug; General pharmacology; In Vitro Techniques; lipid peroxidation; Lipid Peroxidation - drug effects; Liver - drug effects; Liver - metabolism; Male; Medical sciences; Peroxides - pharmacology; Pharmacognosy. Homeopathy. Health food; Pharmacology. Drug treatments; Phenols - pharmacology; Plant Proteins - pharmacology; Polyphenols; rat liver; Rats; Rats, Wistar; Reactive Oxygen Species; Tea; tea polyphenol; tert-Butylhydroperoxide; theaflavin; thearubigin; Rat; Digestive system; Pharmacognosy; Liver; Rodentia; Lipids; Antioxidant; In vitro; Biological activity; Vertebrata; Mammalia; Animal; Plant origin; Theaflavin; Tea extract; Peroxidation
• ISSN: 0918-6158; 1347-5215
• DOI: 10.1248/bpb.17.146

The antioxidative activity of theaflavins (TFs) and thearubigin (TR) purified from the infusion of black tea leaves was examined using the tert-butyl hydroperoxide-induced lipid peroxidation of rat liver homogenates.The concentrations which produced 50% inhibition of lipid peroxidation (IC50) by theaflavin (TF), theaflavin monogallate-A (TFM-A), and TR were 4.88×10-4, 4.09×10-4, and 4.95×10-4% (w/v), respectively. The antioxidative activity of these compounds was higher than that of glutathione, L(+)-ascorbic acid, dl-α-tocopherol, butylated hydroxytoluene, butyl hydroxyanisole, etc., but was lower than the activity of (-)-epicatechin gallate, (-)-epigallocatechin, and (-)-epigallocatechin gallate. As to the IC50 in molarity, the antioxidative activity of TFM-A was the second highest among all the samples used in this study.The antioxidative activity of lyophilized tea infusions was compared. The activity of black tea was about as potent as that of green tea.These results suggest that black tea infusion containing TFs and TR could inhibit lipid peroxidation in biological conditions in the same way as green tea infusion containing epicatechins.