Optimum condition of Streptococcus termophilus, Lactobacillus fermentum, and Lactobacillus plantarum producing yoghurt starter

Abstract

The study aimed to reveal the interaction of temperature and duration of incubation onto total LAB yogurt starter producer. The bacteria inoculated was used are Streptococcus termophilus, Lactobacillus fermentum, and Lactobacillus plantarum. The research method was used are randomized block factorial design was A factor variety of temperature A1 (25 0C), A2 (30 0C), A3 (37 0C), and A4 (42 0C), then B factor range of duration of incubation B1 (12 h), B2 (18 h) and B3 (24 h) within three replications. Best treatment determined by the highest Lactic Acid Bacteria (LAB) level consisted of treatment. Only the best treatment will analyze the proximate. The result showed an interaction between temperature and duration onto total LAB on the yogurt starter producer. It can be concluded that the best results from starter yogurt using three bacterial cultures were obtained at an incubation temperature of 370C for 18 hours with the number of LAB is 5,5 x 1010. Proximate results are the pH value of 4.46, Total Titrations Acid 2.20%, the water content of 82.48%, the protein content of 6.39%, and fat content of 4.36%.