Whey protein concentrate and yacon enhance the nutritional and sensory values in diet yogurt

Abstract

This study aimed at evaluating the chemical composition and acceptability of diet yogurt formulated by adding whey protein concentrate (WPC) and different concentrations of sweet yacon. Four formulations of yogurt were developed using partially skimmed milk, 1.5% of WPC, 1.1% of sweetener, 1.0% of fruit salad essence and concentrations of 8%, 15% and 25% of sweet yacon. The chemical composition of four formulations was analyzed according to the Brazilian regulation criteria. The acceptability of the formulations was evaluated by 82 consumers. The results were evaluated by means of analysis of variance and regression, and using an internal preference mapping. In all the formulations, the protein showed appropriate values as required by the Brazilian regulation. Regarding fat contents, the formulations showed values below 2.9 g × 100 g-1, being classified as partially skimmed product. The higher was the sweet yacon addition, the greater was the yogurt acceptance by consumers. The developed yogurts comply with the requirements of the current consumer market, which cares for products with high nutritional and sensory qualities, and to combine the advantage of functional foods and health benefits.