Ingredient formulation effects on physico-chemical, sensory, textural properties and probiotic count of Aloe vera probiotic dahi

In this study, central composite rotatable design of response surface methodology (RSM) was used to investigate the combined effects of milk fat (2-4 g/100 g), milk solids-not-fat (MSNF; 8-10 g/100 g) and Aloe vera juice (AVJ; 16-20 g/100 g) on probiotic count, physico-chemical, sensory and textural properties of A. vera supplemented probiotic dahi (APD). Analysis of variance indicated that experimental data was well explained by the quadratic model with high efficiency check values (R-2 > 0.78) and the lack-of-fit tests were not significant. The results showed that with increasing AVJ content, pH and water holding capacity (WHC) of APD decreased and consequently syneresis increased. Increasing milk fat and MSNF levels significantly improved WHC and prevented syneresis. Sensory quality was improved by raising the level of milk fat. Improvement in probiotic count was noticed with increasing MSNF and AVJ content probably due to increase in amount and diversity of nutrients. Firmness and work of shear values were increased significantly with milk fat and MSNF levels. AVJ addition decreased the work of adhesion values. Levels of the ingredients in optimized APD with maximum overall acceptability were found to be 4 g/100 g milk fat, 10 g/100 g MSNF and 16 g/100 g AVJ. (C) 2015 Elsevier Ltd. All rights reserved.