Determination Of The Polyhenols And The Antioxidant Activity In The Walnut Green Rind

Widespread in China, walnut (Julans regia L) is a member plant of walnut genera in the walnut family. The paper first made a study on different parts of walnut to determine the types and content of polyphenols in each part. Then three types of walnuts (i.e.walnut, Bulaotun walnut and Eastern Black walnut) were selected as experimental materials and research was mainly focused on the types, content and antioxidant activity of polyphenols within the green rinds of the three types of walnuts.It shows that polyphenols good for man are mainly reserved in green rind and kernel pellicle of walnuts and most highly in the green rind. And among the three types of walnuts, Eastern Black has the highest amount of Total Phenolics, PPP as well as Juglone in its green rind. Walnut ranks second and Bulaotun has the lowest.In terms of number of polyphenol varieties, the green rind of walnut has the most. Eastern Black ranks second and Bulaotun has the least. For each of the three types of walnuts, gallic acid is always of a higher amount compared with other Phenolic Acid materials. And in terms of content, green rind of Bulaotun possesses the highest amount. Eastern Black ranks second and walnut has the least. And for each of the three types of walnuts, Rutin is always of a higher amount compared with other Flavonoid materials. And in terms of content, green rind of Eastern Black possesses the highest amount. Walnut ranks second and Bulaotun has the least. With regard to antioxidant activity, the green rind of Eastern Black is most able when testing antioxidant power by the DPPH method. Bulaotun ranks second and Walnut the weakest.