Development of a Potential Functional Yogurt Using Bioactive Compounds Obtained from the By-Product of the Production of Tannat Red Wine

Abstract

Tannat (Vitis vinifera cv. Tannat) grape pomace, which is mainly composed of peels and seeds, is an abundant by-product of the Uruguayan wine industry. Tannat skin from grape pomace is a sustainable source of bioactive compounds and dietary fiber. In previous studies, Tannat skin has shown antioxidant, antidiabetic, anti-obesity and anti-inflammatory activity, with the potential to prevent the development of chronic diseases. In this work, the encapsulation of bioactive compounds of an ethanolic extract derived from Tannat grape skin by microparticles of whey protein isolate (without and with enzymatic hydrolysis) and inulin (3:1) is studied for its application in yogurt as a potential functional food. Thus, it is proposed to evaluate the release of the bioactive compounds after digestion, for which an in vitro digestive simulation study was carried out simulating the conditions of the gastrointestinal tract. Among the most relevant results, the encapsulants showed increased total polyphenol content (TPC) and antioxidant capacity (p p < 0.05) TPC and antioxidant capacity after in vitro digestion, probably due to the release of bioactive peptides from milk proteins that are part of the yogurt. In conclusion, the antioxidant capacity shown after in vitro digestive simulation by the yogurts formulated with the spray drying encapsulated Tannat grape skin extract represent potential for its application in functional yogurts.

Keywords

• anthocyanins
• bioaccessibility
• bioactive properties
• encapsulation
• functional yogurt
• Tannat grape peel