engleski

Recovery of bioactive phenolic compounds from biologically treated grape pomace by ten filamentous fungi

Grape pomace (GP), a by-product of the wine industry, was used as a substrate for the production of value-added products through the cultivation of the following filamentous fungi under solid-state fermentation conditions: Trametes versicolor TV6 (TV6), Trametes versicolor TV8 (TV8), Trametes versicolor AG613 (TV AG613), Trametes gibbosa (TG), Phanerochaete chrysosporium (PC), Ceriporiopsis subvermispora (CS), Pleurotus eryngii (PLERI), Ganoderma lucidum (GL), Ganoderma resinaceum (GR) and Humicola grisea (HG). Screening of the individual phenolic compound profiles was performed before and after biological treatment during 15 days. The aim was to investigate the influence of biological treatment on the recovery of hydroxybenzoic acids, hydroxycinnamic acids, flavan-3-ols, flavonols, procyanidins and stilbene from GP. The results showed that from the above groups of phenolic compounds, the following individual phenolic compounds stood out with increasing extractability after biological treatment: ellagic acid (EA), o- coumaric acid (o-CoA), gallocatechin gallate (GCG), kaempferol (KA), procyanidin B1 (PB1) and resveratrol (RES), whose concentrations in the untreated initial sample were 34.65 µg/gdb, 4.43 µg/gdb, 291.57 µg/gdb, 10.22 µg/gdb, 304.27 µg/gdb and 46.07 µg/gdb, respectively. The concentrations of EA and o-CoA after biological treatment with CS and TV AG613 were 303.72 µg/gdb and 33.36 µg/gdb (t = 15 d), while the concentrations of GCG, KA, PB1 and RES were 1064.70 µg/gdb, 45.25 µg/gdb, 633.16 µg/gdb and 69.65 µg/gdb after biological treatment with PLERI (t = 10 d for GCG and KA, t = 2 d for PB1, t = 5 d for RES).

grape pomace ; biological treatment ; filamentous fungi ; phenolic compounds

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