Exploring different strategies of separation of antioxidant compounds from winery by-products via surfactant-assisted processes for process intensification and integration

The impact of Tween20 surfactant, applied in native form or as colloidal gas aphrons (CGAs), on the extractability/purification enhancement antioxidant compounds from grape skins (GS), compared to conventional solid–liquid extraction (SLE), was evaluated. Three strategies were developed (S1: partial ethanol replacement during SLE with aqueous solutions; S2: CGAs application GS-extract suspension SLE; S3: addition extracts before spray-drying). effect surfactant/solvent concentration (S1), extract/CGAs volumetric ratio (S2), and surfactant (S3) total phenolic (TPC), anthocyanin (TAC), power recovered phases, investigated. In S1, using surfactants could not significantly reduce percentage solvent achieve a given TPC yield, but similar TAC yields than those obtained when partially replacing Tween20. S2, allowed an averaged 40% recovery TPC, contained crude extract, only slight detected additional exhausted GS. Adding within spray-drying processes enhanced water solubility powdered extracts, despite reducing powder/phenolics yield due increased sample stickiness. Results demonstrated potential employing food-grade at different stages pomace valorization process for extracts.