Antioxidant and Antimicrobial Activities of the Extracts from Different Species.

Background: is a large genus which has promising bioactivities. However, the properties of many species have not been investigated thoroughly.

Aim: To determine the antioxidant and antimicrobial capabilities of the extracts from different species. . Six species, including , , , , , were extracted using -hexane, ethyl acetate, and methanol, producing -hexane extract (HE), ethyl acetate extract (EAE), and methanol extract (ME). After that, the total polyphenol content was evaluated using Folin-Ciocalteu assay. DPPH, hydroxyl radical scavenging, and total antioxidant capacity assays were performed to test the antioxidant activity. Subsequently, the antimicrobial activities against Gram-positive (, ) and Gram-negative (, ) bacterial strains were assessed using Kirby Bauer and the broth microdilution methods.

Results: Many extracts contained high total polyphenol content consisting of ME of ad , and EAE of and . The EAE of showed effective antioxidant capacity (IC = 1.5 g/mL). Additionally, the EAE of was effective against Gram-positive bacteria with minimal inhibition concentration (MIC) of 15.625-25 g/mL whereas ME of was effective against both Gram-positive bacteria (MIC = 160 g/mL) and Gram-negative bacteria (MIC = 75 g/mL).

Conclusion: Several extracts of species demonstrated valuable antioxidant and antimicrobial properties.