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Development and characterization of light yoghurt elaborated with Bifidobacterium animalis subsp. Lactis Bb-12 and fructooligosaccharides

Desenvolvimento e caracterização de iogurte light elaborado com Bifidobacterium animalis subsp. Lactis Bb-12 e fruto-oligossacarídeos

ABSTRACT:

This study aimed to evaluate the effects of adding probiotic culture (Bifidobacterium animalis subsp. Lactis Bb-12) and prebiotics (fructooligosaccharide - FOS) to yoghurt formulations stored at 4°C for 28 days, using an experimental design (independent variables: (0-3% of FOS and probiotic starter cultures 0-3%). The pH, acidity, fat, syneresis, protein, ºBrix, sugars, FOS and probiotic bacteria count were analyzed. The probiotic- and prebiotic-added yoghurt formulations showed lower acidity, syneresis and glucose than the control yoghurt and compared to formulations containing probiotic and prebiotic separately. The 3% probiotic and prebiotic formulation showed a lower loss of concentration of FOS, and after 28 days presented 1.5g of FOS per 100g (0.3% kestose, 0.7% nystose, 0.5% fructosyl-nystose). Furthermore, the addition of prebiotics exerted a protective effect on probiotic bacteria, enhancing their survival.

Key words:
yoghurt; probiotic; Bifidobacterium; prebiotics; fructooligosaccharides

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