The winemaking process generates large amounts of by-products that are still a potential source of bioactive compounds to be used as functional food ingredients. This study is aimed to develop… Click to show full abstract
The winemaking process generates large amounts of by-products that are still a potential source of bioactive compounds to be used as functional food ingredients. This study is aimed to develop a cow milk kefir fortified with Sangiovese red grape pomace. The phenolic extracts of skins and seeds, which were obtained after infusion and ultrasound-assisted extraction (UAE), were rich in (+)-catechin (105.0±147.0 mg/L) and (-) epicatechin (76.0±364.0 mg/L) based on HPLC-DAD analysis. The UAE-derived skin extracts were selected for their best antioxidant effectiveness and incorporated into kefir, whose functional properties have been investigated through spectrophotometric assays. The addition of UAE-derived skin extract to kefir was significantly effective in enhancing the total phenolic content (43.2 %) thus increasing the total antioxidant capacity (+47.7 %) and lowering IC50ABTS (-36.0%) and DPPH (-31.45%). An increased inhibitory activity towards ?-amylase, ?-glucosidase and pancreatic lipase was also achieved by decreasing the corresponding IC50 values (69.39 and 73.01 "g/mL, respectively).
               
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