Valorization of Grape Waste for Sustainable Mushroom Cultivation

The global wine industry generates substantial volumes of grape pomace (GP), a lignocellulosic by-product rich in fiber, phenolic compounds, and unsaturated fatty acids. Improper disposal of GP contributes to environmental pollution and underutilizes a resource abundant in bioactive molecules. This chapter explores the valorization of grape waste through its integration into sustainable mushroom cultivation, particularly with species (oyster mushrooms). Given their strong enzymatic capacity to degrade lignocellulose, oyster mushrooms can efficiently convert GP into high-value edible biomass. Incorporation of this waste material into mushroom substrates not only promotes mycelial growth and fruiting but also enriches the nutritional and functional profiles of the harvested mushrooms, enhancing levels of ergosterol, β-glucans, resveratrol, and antioxidant activity. Comparative analyses with traditional substrates (e.g., paddy straw, wheat straw, sawdust) demonstrate that GP offers competitive or superior yield performance when optimized with co-substrates. The health-promoting properties of mushrooms cultivated on GP, including antidiabetic, anticancer, and immunomodulatory effects, further highlight their functional food potential. This valorization approach exemplifies sustainable bioconversion, offering economic, environmental, and nutritional benefits through synergistic integration of winery and mushroom production sectors.