Study On Extracting Technology And Antioxidant Activity In Vitro Of Polyphenolic Compounds From The Fruit Of Chinese Jujube (Ziziphus Jujuba Mill.)

The extracting technology of polyphenolic compounds from the different parts of "Jinsixiaozao" has been studied. Based on this, we did some research on the content change of polyphenols compounds in different parts of 3 cultivars of Chinese jujube(Ziziphus jujuba Mill.),"Jinsixiaozao","Zanhuangdazao" and "Fupingdazao" during the fruit development, and compared the content of polyphenolic compounds in skin, flesh and core from the three cultivars. Then the antioxidant activity in vitro of the crude polyphenolic extracts from the three parts of the fruit at different periods were assayed. The main results are as follows:1. The optimum condition for extracting polyphenolic compounds of the skin and the flesh from Chinese jujube were determined to be 40 % ethanol at 60 ℃ water bath for 60 min and solid to liquid ratio 1:30 for twice. And the optimum condition of the core from Chinese jujube were determined to be 80% of pH3.0 ethanol at 50 ℃ water bath for 12 h and solid to liquid ratio 1:30 for twice.2. During the development of the jujube fruit, the content of polyphenolic compounds in the skin is high in the initial picked stages and the white-ripe periods of "Jinsixiaozao", but "Zanhuangdazao" is high in the prophase of white-ripe periods. The content of polyphenolic compounds has no evident change from the skin of "Fupingdazao".In the flesh and the core, though there are some differences among the content of polyphenolic compounds from the three cultivars, it is high in the initial picked stages, up to fruit ripe the content decreased slowly.3. In the cycle of growing entirely, the average content of polyphenolic compounds in the skin of "Jinsixiaozao" is much higher than the flesh, and the core is between two parts. In "Zanhuangdazao" and "Fupingdazao", the content of polyphenolic compounds from the core of the fruits are the highest, then are the skin and the flesh, respectively.4. A great difference existed in the content of polyphenolic compounds in the same part of different Chinese jujube cultivar. The content of polyphenolic...