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Revista mexicana de micología

versão impressa ISSN 0187-3180

Resumo

ISLAS-SANTILLAN, Miguel Ángel et al. Preliminary study of antioxidant activity of three species of Ganoderma genus (Polyporaceae) native of Hidalgo State, México. Rev. Mex. Mic [online]. 2017, vol.46, pp.37-45. ISSN 0187-3180.

Background:

Metabolism produce free radicals, which damage cells and biomolecules, causing lipid peroxidation, aging process and chronic degenerative diseases. The genus Ganoderma has metabolites with antibacterial, anti-cancer, anti-tumor, anti-inflammatory and antioxidant activities.

Objective:

Compare antioxidant capacity and total polyphenols content of ethanolic and aqueous extracts (basidiomes and mycelium) of three species of Ganoderma from Hidalgo State.

Methods:

Antioxidant capacity was evaluated by the ABTS method and total polyphenols content by the Folin-Ciocalteu method. Statistical tests included variance analysis (ANOVA), Tukey test and generalized linear discriminant analysis (AFDG).

Results and conclusions:

Significant differences were observed between aqueous and ethanolic extracts, the highest activity happened in ethanolic extracts of G. brownii, G. applanatum (GaA-b) and G. curtisii (GcZ-b) and aqueous extracts of G. brownii, G.applanatum (GaA-m) and G. curtisii (GcA-m), the most active was G. brownii (GbT-m). The AFDG analysis explained 77.96% of the variance in first discriminant function by antioxidant capacity and phenols present in ethanolic extracts and 20.07% in second function correlating phenols of both extracts and antioxidants in aqueous extracts. These results show that antioxidant activity is determined by the presence of phenols, polysaccharides and sterols, varying according to the species, stage of development, extract and collection area.

Palavras-chave : free radical; ABTS; sterols; polyphenols/phenols.

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