摘要
研究了嗜热链球菌、双歧杆菌和植物乳杆菌在冷冻干燥条件下,保护剂对细胞冻干存活率和冻干发酵剂活菌含量的影响,得出最高活菌含量,嗜热链球菌为1.2×109个/g,双歧杆菌为8.4×108个/g,植物乳杆菌为1.4×109个/g。采用最适保护剂制成的试验菌株冻干发酵剂在42℃乳中发酵10h,发现其细胞生长曲线、产酸曲线及pH值下降曲线与冻干前对照发酵剂相比,均无明显变化。在贮藏试验的研究中,发现4℃以下贮存,存活率较高,混合菌的贮存期明显高于单一菌。在人工胃液中的存活率,混合菌也明显好于单一菌。
The effects of the protective agent on the survival rate of cells and the living cell number of freeze -drying starter were studied during the freeze-drying of S. thermophilus, Bifidobacterium and Lactobacilus planetarium. The highest survival cell contents of the above-mentioned bacteria were 1.2×10^9/g, 8.4× 108/g andl.4× 10^9/g, respectively, The freeze-drying starters with suitable protective agent were fermented in milk medium at 42 ＊C for 10 h and their growth curves, acid-producing curves and the pH value curves with or without freeze-drying had no obvious difference. It was also found that the storage of complex bacteria was better than that of the single bacteria below 4 ℃, The survival percentage of the complex bacteria was higher than that of the single in the artificial gastric juice.
出处
《现代食品科技》
EI
CAS
2007年第5期46-49,共4页
Modern Food Science and Technology
关键词
合生素
益生菌
保护剂
synbiotics
probiotic bacteria
protective agent
