Influence of lactose hydrolysis on galacto-oligosaccharides, lactose, volatile profile and physicochemical parameters of different yogurt varieties

BERGAMINI CARINA V.; WOLF, I. VERÓNICA; VÉNICA, CLAUDIA INES; PEROTTI M.CRISTINA

DAIRY SCIENCE & TECHNOLOGY

EDP SCIENCES S A

Lugar: Paris; Año: 2016 vol. 96 p. 4929 - 4939

1958-5586

BACKGROUND: Different types of reduced-lactose yogurt, obtained by lactose hydrolysis using ?Ò-galactosidase enzyme, are commercially available. The breakdown of lactose modifies the carbohydrate profile, including the production of prebiotic galacto-oligosaccharides (GOS), which could affect the survival and activity of starter and probiotic cultures and the parameters of yogurt quality. The extension of these changes is dependent on the yogurt matrix composition. This study aimed to evaluate the influence of lactose hydrolysis on GOS, lactose, volatile profile and physicochemical parameters of different yogurt varieties during storage. RESULTS: The presence of ?Ò-galactosidase enzyme did not affect neither the global composition nor the survival of cultures. Overall, the hydrolyzed products had lower acidity than traditional ones. GOS were found at similar levels in fresh hydrolyzed yogurts, whereas in traditional yogurts were not detected. The proportion of ketones, acids and aldehydes seems to be more dependent on yogurt variety than the addition of the enzyme. Likewise, the storage period affected the volatile fraction in different degree; the increase in acid compounds was more pronounced in hydrolyzed than traditional yogurts.CONCLUSION: This work shows that it is possible to obtain different varieties of reduced-lactose yogurt, some of them with additional benefits to health such as reduced-fat, reduced-calories, added with probiotic/inulin and enriched in GOS, with similar characteristics to traditional products.