Abstract
Edible mushrooms capable of degrading condensed tannins were selected in solid-state culture using coffee pulp and coffee husk as substrates. Eight different strains of Pleurotus, Ganoderma, and Lentinula were screened showing positive results. Several parameters, such as morphology of the colony, apical growth, biomass, and the pH were studied. Biochemical analyses of P. ostreatus, strain CP-50, growing on coffee-husk agar (CHA) have shown that this mushroom degrades the polyphenols presents in the culture medium. Three strains of P. ostreatus (CP-11, CP-37, CP-50), selected for further studies, degraded up to 75.4 % of condensed tannins after growing for 24 days on coffee-husk solid culture medium. This research opens up the possibility to recycle solid by-products from the coffee agro-industry as substrates in solid-state fermentation, using strains of edible mushrooms for degrading hydrolysable tannins by tannases, and for producing fruit bodies as a human food.
Published Version
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