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From the ethyl acetate extract obtained from the methanol extract of the mushroom Pleurotus sajor-caju, ten compounds conforming the triterpenic fraction were isolated by means of chromatographic techniques like CC and PTLC, and were identied by their MS as: Ergosta-2,5,7,9(11),22-pentaene, Ergosta-5,7,9(11),22-tetraen-3β-ol, Ergosta-5α,8α-epidioxy-6,22-dien-3β-ol (ergosteryl peroxide), Ergosta-5,7,22-trien-3β-ol (Ergosterol), Ergosta-7,22-dien-3β-ol, 19-Norergosta-5,7,9,22,tetraen-3β-ol (Neoergosterol), Ergosta-7-en-3β-ol, Ergosta-3β-5α,6β-trihydroxy-7,22-diene (Cerevisterol), Ergosta-4,6,8(14),22-tetraen-3-one and Ergosta-4,6,15(16),22-tetraen-3-one. Likewise, three fatty acids were found and identied as palmitic acid, linoleic acid and stearic acid.Keywords: Fungi, sterols, triterpenoids, fatty acids, Pleurotus sajor-caju. INTRODUCTION Mushrooms belonging to the Pleurotus genus, more known as oyster mushrooms, alluding to its appearance, have brought great interest due to the versatility of their crop, which contains a wide substrate variety, including agroindustrial waste. However, studies made around its chemical composition have been left aside and are focused in evaluating the optimization of processes involving biomass production. Sajor-caju species is an edible mushroom of clear colors, saprophyte, primary degrader and wood decomposer from which reports have not been found besides the isolation and quantication of ergosterol [IV]

TRITERPENOIDS AND FATTY ACIDS IDENTIFIED IN THE EDIBLE MUSHROOM Pleurotus sajor-cajú