Wine Grape Pomace as Antioxidant Dietary Fiber for Enhancing Nutritional Value and Improving Storability of Yogurt and Salad Dressing

Abstract

Wine grape pomace (WGP) as a source of antioxidant dietary fiber (ADF) was fortified in yogurt (Y), Italian (I) and Thousand Island (T) salad dressings. During the three weeks of storage at 4 °C, viscosity and pH of WGP-Y increased and decreased, respectively, but syneresis and lactic acid percentage of WGP-Y and pH of WGP-I and WGP-T were stable. Adding WGP resulted in 35-65% reduction of peroxide values in all samples. Dried whole pomace powder (WP) fortified products had dietary fiber content of 0.94-3.6% (w/w product), mainly insoluble fractions. Total phenolic content and DPPH radical scavenging activity were 958-1340 mg GAE/kg product and 710-936 mg AAE/kg product, respectively. The highest ADF were obtained in 3%WP-Y, 1%WP-I and 2%WP-T, while 1%WP-Y, 0.5%WP-I and 1%WP-T were mostly liked by consumers based on the sensory study. Study demonstrated that WGP may be used as a functional food ingredient for promoting human health and extending shelf-life of food products.Keywords: yogurt, antioxidant dietary fiber, wine grape pomace, salad dressing, storabilityKeywords: yogurt, antioxidant dietary fiber, wine grape pomace, salad dressing, storabilit