Effect of Fermented Temperature on the Viable Bacteria Counts of Freeze-dried Starter

At 30℃、34℃、37℃、42℃,the effect of fermented temperature on the viable bacteria counts of freeze-dried starter of lactic acid bacteria made up Lactobacillus bulgaricus and Streptococcus thermophilus was studied.In order to obtain more viable bacteria counts,pH of fermented liquid was controlled within 6.0～6.3 with 30% Na_2CO_3.The result indicated that: fermented temperature can remarkably affect the viable bacteria counts of freeze-dried starter.The optimum fermented temperature of lactic acid bacteria is at 30℃ and its viable bacteria counts can reach 4.2×10~(11) cfu/g.