Nowadays, new food products are launched in the market, and the main focus of the dairy industry is on functional products. Thus, the first objective of this work was to develop a fermented dairy drink with probiotic characteristics. Furthermore, milk serum and soy hidrosoluble extract were used as substrates increasing the value of low cost raw materials that have functional features, as reported in the literature. Based on these aspects, an experimental design was used to investigate the formulation of a peach- flavored dairy drink using milk serum, cow milk and soy hidrosoluble extracts. The formulation with 30% of soy hidrosoluble extract, 36.6% of cow milk and 33.3% of milk serum was found as ideal in terms of sensorial analysis and cell growth evaluation. Organoleptical, physicochemical, and microbiological analyses determined the shelf life of the product. During the storage period, the peach- flavored dairy drink presented viable cells according to the Legislation (1 x 106 UFC.mL-1) for 22 days. The physicochemical quality changed slightly since the acidity presented high values after the 22nd day. The sensorial quality defined the shelf life as 14 days without the addition conservants due to the high acidity value of the fermented dairy drink determined.
probiotic; formulation; dairy drink; Bifidobacterium
