Mycelial growth, antioxidant and antibacterial properties of Boletus griseipurpureus from south Thailand
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Abstract
Boletus griseipurpureus Corner is a popular edible ectomycorrhizal mushroom in the south of Thailand. The objective of this study was to identify optimal media for mycelial formation, antioxidant and antimicrobial activities. Of the four media tested, PDA, Boletus medium, MMN, and MMN with 10 % fresh basidiocarp hot water extract, the latter medium was superior for mycelial dry weight increment. Methanolic extraction of dried basidiocarps showed that the DPPH radical scavenging activity (200.3+4.4 µg vitamin C/g sample) was stronger than crude ethyl acetate extract (77.9+0.4 µg vitamin C/g sample). Ferric reducing antioxidant power (FRAP) gave similar results. Crude basidiocarp extracts inhibited Pseudomonas aerunginosa TISTR 2370 (MIC = 0.39 mg/ml) and Enterococcus faecalis TISTR 379 (MIC = 0.78 mg/ml) in agar well diffusion tests.
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