裸花紫珠提取物及其主要成分抗氧化活性研究

裸花紫珠是海南一种道地药材,具有消炎止血的功效。裸花紫珠富含黄酮类和苯乙醇苷类化学成分,它们已经被证实是天然抗氧化剂的主要来源之一。为了考察裸花紫珠药材的抗氧化活性,该研究采用DPPH.自由基清除法测定裸花紫珠醇提物、4个不同极性部位(石油醚、乙酸乙酯、正丁醇、水)及其7个主要成分的抗氧化作用。结果表明：裸花紫珠醇提物、醇提物的水部位、正丁醇部位、乙酸乙酯部位和化合物木犀草素、木犀草苷、毛蕊花糖苷具有较强的抗氧化活性,而5-羟基-3,7,3′,4′-四甲氧基黄酮的抗氧化活性则较弱。该研究结果为裸花紫珠的保健功能开发提供了依据。

Antioxidant activities of extracts and their main constituents of Callicarpa nudiflora

Callicarpa nudiflora is a famous region drug of Hainan Province, which is mainly used as anti-inflammatory and hemostatic agents. The plant is rich in flavonoids and phenylethanoid glycosides, which have been proved to be one of the main source of natural antioxidants. To investigate the antioxidant capacities of C. nudiflora, the authors use DP-PH scavenging method to determine the antioxidant activity of different polar extracts of C. nudiflora and its main constit-uents. The alcohol extract, water fraction, butyl alcohol fraction, ethyl acetate fraction showed strong antioxidant activity. Three main compounds, luteolin, luteolin-7-O-β-D-glucoside and acteoside, possessed significant antioxidant activity while 5-hydroxy-3,7,3′,4′-tetramethoxyflavone exhibited weak antioxidant activity. The research will provide the evidence for development of health products of C. nudiflora.