Analysis of the Content of Components in Different Extraction Parts of Angiopteris fokiensis Hieron Leaf Extracts and Their Correlation with Antioxidant Activity

In this study, the leaves of Angiopteris fokiensis Hieron were used as materials to explore the contents and antioxidant activities of total flavonoids and total phenols in different solvent extraction parts of its ethanol extracts, and their correlation was analyzed. The contents of total flavonoids and total polyphenols in each extraction part were determined by Al(NO₃)₃ complexation method and Folin-phenol method, respectively. The antioxidant activity of each part was evaluated by (DPPH, ABTS, Prussian blue) method and lipid peroxidation inhibition ability. Pearson method was used to analyze the correlation between the two components and antioxidant activity. The results showed that the contents of total flavonoids (271.05±2.82 mg/g) and total phenols (59.62±3.23 mg/g) in the ethyl acetate site of the leaves of Angiopteris fokiensis Hieron were the highest, and all parts had good antioxidant activity, among which the ethyl acetate site had the strongest antioxidant activity in a dose-dependent manner. Correlation analysis showed that the antioxidant activity of each part was significantly positively correlated with the contents of total flavonoids and total polyphenols (P<0.01). Therefore, all parts of the Angiopteris fokiensis Hieron had the contents of total flavonoids and total phenolsand and antioxidant effects, and the ethyl acetate part was the best. The active ingredient might be total flavonoids and total phenols.