Estabilidade da cor e teor de vitamina c do iogurte elaborado com corantes de betalaína microencapsulados em spray dryer

Abstract

The processed product color is related to quality, thus the usage of dyes has become a common and necessity practice. The red beet can be obtained from the extracted juice of beet roots. This dye contains various pigments belonging to the betalains group and their addition combined with ascorbic acid prevents the natural deterioration, holds its integrity and helps to preserve the shelf life for fermented milk products. The objective of this study was to evaluate the acceptability, color stability color and vitamin C content in three formulations of strawberry flavored yogurt: yogurt produced with artificial unencapsulated red dye Bordeaux (A). yogurt produced with natural coloring of encapsulated betalains with malt dextrin (B) and yogurt produced with natural dye made of betalains encapsulated with Arabic gum (C). The formulations were subjected to microbiological testing, acceptance testing, purchase intent, pH, ascorbic acid content and color stability test at a temperature of 10 º C in the presence and absence of light. Satisfying the law requirements , the microbiological analysis revealed absence of total coliform population, coliform and yeast and mold above the established levels. The sensorial analysis found that 50.7% preferred yogurts with natural dyes and 77.3% would buy the yogurt with natural betalains dye encapsulated with Arabic gum. All formulations showed good stability to pH variation between 3.88 and 4.38 and the index of degradation of ascorbic acid with significant reduction of up to 68.96%. The formulations of yogurt prepared with natural encapsulated dyes and non-encapsulated artificial differ (p <0.05) when stored in the presence and absence of light. It was observed that yoghurt produced with betalains encapsulated dye with Arabic gum showed higher color stability following seven weeks storage, proving that the addition of this dye in its fermented milk offers a viable alternative to replace synthetic dye.