吉林地区沙棘红茶活性成分及抗氧化活性的研究

对沙棘叶及其制品红茶进行化学成分的研究，并对其抗氧化活性进行评价。方法：利用福林酚比色法、亚硝酸钠-硝酸铝-氢氧化钠显色法、苯酚硫酸法和国家标准方法《茶咖啡碱测定》，对沙棘茶中茶多酚、黄酮、多糖和咖啡碱含量进行分析；采用DPPH?、ABTS+、OH?和还原力4种方法进行抗氧化评价。结果：沙棘红茶主要化学成分：茶多酚为18.45%，黄酮含量为2.51%，多糖含量为15.56%，咖啡碱含量为3.06%；体外抗氧化实验结果表明，沙棘叶及其制品红茶对清除DPPH?、ABTS+ 、?OH自由基的IC₅₀分别为2.47 mg/mL和0.76 mg/mL、0.0040 mg/mL和0.0038mg/mL、0.48mg/mL和0.41mg/mL，还原力与浓度有较好的剂量依赖关系。结论：由于沙棘红茶中含有有茶多酚、黄酮和多糖等活性成分因而有较好的抗氧化活性。

Study on the Chemical Constituents and Antioxidant Activity of Black Tea from Hipopphae Rhamnoides L.Leaves in Jilin Province

The chemical constituents and antioxidant potentials of Hipopphae rhamnoides L. leaves and its black tea product were investigated. Methods: The contents of tea polyphenols, flavonoids, polysaccharides and caffeine were analyzed by Folin colorimetric method, Sodium nitrite-aluminum nitrate-sodium hydroxide colorimetric method, Phenol-sulfuric acid method and national standard method of "Theophylline determination"; Four methods including DPPH?, ABTS+, ?OH and reducing power were used to evaluated antioxidant activity. Results: The main chemical components of the black tea: tea polyphenols was 18.45%, flavonoids content was 2.51%, polysaccharides content was 15.56% and caffeine content was 3.06%; the results of in vitro antioxidant experiments showed that the IC₅₀ of Hipopphae rhamnoides L. leaves and its black tea on scavenging DPPH?, ABTS+ and?OH free radicals were 2.47 mg/mL and 0.76 mg/mL, 0.0040 mg/mL and 0.0038 mg/mL, 0.48 mg/mL and 0.41 mg/mL, respectively. They also had a certain reducing power and a good concentration dependence. Conclusions: The antioxidant activity of black tea is better because of active ingredients such as tea polyphenols, flavonoids and polysaccharides.