Physicochemical Characteristics and Biological Activities of Polyphenols from Lachnum

Lachnum YMU50 total extracellular polyphenols (LTEP) were extracted and purified. The physicochemical properties, antioxidant and antibacterial activities of LTEP were investigated. UV spectroscopy analysis indicated that LTEP had typical characteristics absorption peaks of phenolic at 270 nm and 340 nm. IR spectroscopy displayed that LTEP had characteristics absorption peaks of phenolic at 3354.360 cm −1 and 1048.762 cm −1 . Antioxidant trials showed that the scavenging effect of LTEP on , DPPH, ·OH and 2 O   2 NO  were 76.43%, 72.70%, 55.56% and 59.40% re- spectively, at the 2 mg/mL concentration of LTEP. LTEP also showed a significantly antibacterial activity against Staphylococcus aureus, S. cerevisiae, E. coli, and Salmonella typhi. The MIC (minimum inhibitory concentration) of these four strains was 0.05, 0.1, 0.1 and 0.2 mg/mL, respectively. The results revealed that LTEP had strong antioxidant and antibacterial activities.