为获得具有高抗氧化活性的红枣多酚,文中选用不同极性有机溶剂分级萃取红枣多酚粗提物中的不同极性多酚,并比较各极性部位提取物的多酚提取率、总酚含量及抗氧化活性。结果表明:液-液萃取的方法可以实现不同极性红枣多酚的有效分离,极性越强,其提取物的多酚提取率、总酚含量和抗氧化活性越高,即具高抗氧化活性的红枣多酚以极性酚为主。因此,通过去除粗提物中的弱极性部位多酚,以获得具高抗氧化活性的红枣多酚。

Organic solvents with different polarities were used to extract jujube polyphenols with high antioxidant activity.The extraction rates,total phenolic contents and antioxidant activities of the obtained extracts were compared.The results indicated that liquid-liquid extraction was a successful method for separating jujube polyphenols with different polarities.The stronger the polarity of organic solvent is,the higher the extraction rates,total phenolic contents and antioxidant activities of the extracts are.Most jujube polyphenols with high antioxidant activity are polar phenols.Therefore,weak polar polyphenols should be removed from crude extracts to achieve high antioxidant activity extract.