The comparative phytochemicals, antioxidative and antidiabetic activities of Camellia sinensis (black tea) and Aspalathus linearis (rooibos tea) were studied in vitro and ex vivo. Concentrated infusions of the teas showed significant free radical scavenging activities in vitro. They significantly increased the glutathione level, superoxide dismutase and catalase enzyme activities in oxidative hepatic injury, while concomitantly depleting malondialdehyde level. The teas significantly inhibited intestinal glucose absorption and α-amylase activities, and elevated muscle glucose uptake. LCMS phytochemical profiling revealed the presence of hydroxycaffeic acid, l-threonate, caffeine, vanillic acid, n-acetylvaline, and spinacetin 3-glucoside in C. sinensis. While quinolinic acid, coumestrol, phloroglucinol, 8-hydroxyquercetagetin, umbelliferone, and ajoene were identified in A. linearis. These results portray the antioxidant and antidiabetic potencies of both teas, with A. linearis showed better activity compared to C. sinensis. These teas may thus be used as functional foods in the management of diabetes and other oxidative stress related metabolic disorders.

对茶树（红茶）和茶树（路易波士茶）的植物化学物质、抗氧化和抗糖尿病活性进行了体外和离体比较研究。茶的浓缩浸液在体外显示出显着的自由基清除活性。它们显着增加氧化性肝损伤中的谷胱甘肽水平、超氧化物歧化酶和过氧化氢酶活性，同时降低丙二醛水平。这些茶显着抑制肠道葡萄糖吸收和 α-淀粉酶活性，并提高肌肉葡萄糖摄取。 LCMS 植物化学分析表明，中华茶中存在羟基咖啡酸、L-苏糖酸盐、咖啡因、香草酸、n-乙酰缬氨酸和菠萝素 3-葡萄糖苷。而线形曲霉中还鉴定出喹啉酸、香豆雌酚、间苯三酚、8-羟基槲皮素、伞形酮和阿霍烯。这些结果描绘了两种茶的抗氧化和抗糖尿病功效，其中线形茶表现出比中华茶更好的活性。因此，这些茶可以用作治疗糖尿病和其他氧化应激相关代谢紊乱的功能性食品。