Antioxidant and Antibacterial Activities of Different Extracted Parts from Branches and Leaves Extracts of the Peristrophe baphica (Spreng.) Bremek

In this work, the ethanol extracts of the branches and leaves of Peristrophe baphica (Spreng.) Bremk (PB) as well as the different solvent extracted part of the ethanol extracts were prepared and their antioxidant and antibacterial activities were studied. The contents of total polyphenols and flavonoids of the extracts were determined by Folin-Ciocalteu and NaNO₂-Al(NO₃)₃ method, respectively. The antioxidant activities were evaluated by DPPH radical scavenging ability, ABTS⁺ radical scavenging ability and total reducing power. The relation between the antioxidant activities and the ethanol extracts as well as the different solvent extracted parts was correlated. The antimicrobial activities of the extracts against several common pathogenic bacteria were determined by Oxford cup method. The results showed that the content of total polyphenols in ethyl acetate part were the highest for both branches and leaves, which was 79.76 mg/g and 80.21 mg/g, respectively. The highest content of flavonoids located in chloroform part of branches and the ethanol extract of leaves, which was 95.88 mg/g and 96.75 mg/g, respectively. The correlation analysis showed that the antioxidant activities of each part were strongly correlated with the contents of total polyphenols. In the test concentration range, different parts of tissue and different solvents had important influence on the antioxidant and antimicrobial activities. The antioxidant activities of branches were better than those of leaves, but the antibacterial activities of leaves were better than those of branches. The ethyl acetate part of branches, the ethyl acetate part and the n-butanol part of leaves showed better antioxidant and antimicrobial activities and could be used for further application.