扁枝槲寄生提取物体外抗氧化效应研究
Determination of antioxidant activity of Visum ardiculatum in vitro
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摘要: 采用水浴和超声两种提取方式,分别用水和无水乙醇提取扁枝槲寄生(俗称"螃蟹脚"),再用氯仿、乙酸乙酯和正丁醇萃取两种方式的水提取物,得到不同的萃取组分.分别测定各萃取组分的总游离氨基酸、茶多酚、茶多糖和总黄酮的含量,及其对DPPH自由基、ABTS自由基、超氧阴离子、羟基自由基的清除能力和FRAP值.结果表明,"螃蟹脚"具有良好的体外抗氧化活性,各提取-萃取组分对ABTS自由基的清除率最高均能够达到98%以上,对DPPH自由基的清除率最高均可达到88%以上.由模糊评价法得到的抗氧化综合值能够很好地反映各组分的总抗氧化能力,水浴水提取物综合值最高,为4.66,水浴水提取物的氯仿萃取层综合值最低,为0.21.其与茶多酚(P<0.05)和黄酮(P<0.01)的含量显著相关."螃蟹脚"中茶多糖的含量高达5468.08 mg/100 g.Abstract: Visum ardiculatum was extracted by water bath and ultrasonic, and its four fractions of chloroform, ethyl acetate, n-butanol, and water were prepared. The free-amino acid, total polyphenol, tea polysaccharides and flavonoids contents Visum ardiculatum were determined. So were the scavenging effects of different parts of Visum ardiculatum on DPPH radical, ABTS radical, superoxide anion and hydroxyl radical and FRAP value. The results showed that the antioxidant activity of Visum ardiculatum in vitro was potent. The scavenging effects of all the fractions on ABTS radical reached 98% and that of DPPH radical reached 88%. The synthetical value calculated by fuzzy assessment was respective of the 5 antioxidant assays.The highest was 4.66 of water extracts by water bath, the lowest was 0.21 of chloroform fraction. It was largely due to the total polyphenol (P<0.05) and flavonoids contents (P<0.05).The content of tea polysaccharides reached 5 468.08 mg/100 g.
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Key words:
- Visum ardiculatum /
- antioxidant /
- correlation /
- fuzzy assessment
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