Comparison of Composition, Free-Radical-Scavenging Capacity, and Antibiosis of Fresh and Dry Leave Aqueous Extract from Michelia shiluensis

Numerous plants of medicinal value grow on Hainan Island (China). Given the lack knowledge phytochemical and pharmacological properties Michelia shiluensis Chun Y. F. Wu (M. shiluensis), application natural antioxidants antimicrobials in food industry has attracted increasing interest. This study aimed to compare chemical composition, free-radical-scavenging capacity, antibiosis aqueous extracts fresh dried leaves M. shiluensis. The extract was obtained using steam distillation, its components were separated identified via gas chromatography–mass spectrometry (GC-MS). capacity determined. Further, 28 20 compounds isolated from leaf (MSFLAE) (MSDLAE), respectively. MSFLAE MSDLAE determined by 2,2-diphenyl-1 picrylhydrazyl (DPPH) method, which 43.43% 38.74%, scavenging 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonate (ABTS)) method 46.90% 25.99%, iron ion reduction ferric-reducing antioxidant power (FRAP) as 94.7 62.9 μmol Fe2⁺/L, indicated that two had a certain higher than MSDLAE. three foodborne pathogenic bacteria low, but antimicrobial effects Gram-positive better those Gram-negative bacteria. Escherichia coli Staphylococcus aureus greater Finally, both capacities antibiosis, confirming use this plant research development antibacterial agents reasonable. Plant are an essential source related phytochemistry have immense potential.