Effects of Lactulose Levels on Yoghurt Properties

Therapeutic levels of lactulose were used with commercial starters (Yoflex 801, Yoflex 901 and Yomix 486) in yoghurt. In fact, Yoflex 801 was supplemented with 1.5% lactulose resulting in minor yoghurt quality alterations. This co-culture was retained to study the influence of lactulose levels (0, 4, 6, and 8 %) on yoghurt quality for 28 days at 4°C. Kinetic parameters, syneresis, proteolysis degree, and sensory characteristics were improved by increasing lactulose dose; thus, thixotropic and pseudoplastic gel was shown. Accordingly, functional yoghurt fermented with Yoflex 801, containing 4 to 6% of lactulose, proved to be the most adequate choice.