Polyphenolic Content And Antioxidant Activity Of Mycelia And Basidiomes Of Oyster Mushrooms Pleurotus Spp. (Agaricomycetes) From Brazil

This study aimed to examine the antioxidant activity, total phenolic content, and phenolic profile of nine strains of Pleurotus spp. isolated in southern Brazil. Basidiomes were obtained from a solid-state culture in medium containing Pinus sp. sawdust (SCM-PSW), coffee grounds (CG), or organic grape waste (OGW). Mycelia were obtained from submerged culture-potato dextrose broth (MSC-PDB). Basidiomes had the highest total phenolic content (between 31.30 +/- 0.26 and 47.00 +/- 0.12 mg gallic acid equivalents [GAE]/g) compared with mycelia (between 8.15 +/- 0.26 and 15.96 +/- 0.82 mg GAE/g). Antioxidant activity of the basidiomes showed an IC50 value between 5.36 +/- 0.27 (88F.13) and 10.68 +/- 0.22 mg/mL (189H.3). Mushrooms produced in the OGW and CG media had higher total phenolic content than those from MSC, indicating that they can serve as sources of bioactive compounds on culture media. These findings show the potential of natural wastes to be used as a strategy for increasing secondary metabolites in edible mushrooms, proposing an interesting approach for the nutraceutical and pharmaceutical industries.