Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (4): 296-303.doi: 10.13560/j.cnki.biotech.bull.1985.2022-0954

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Study on Factors Affecting the Storage Survival Rates of Probiotic Bacteria Powder

YAN Tao(), CHEN Ke-ke, YANG Heng-fei, ZHU Jian-guo, XIA Jiu-xue, FANG Shu-guang()   

  1. Wecare Probiotics Co., Ltd., Suzhou 215200
  • Received:2022-07-31 Online:2023-04-26 Published:2023-05-16

Abstract:

This work is aimed to study the factors affecting the storage activities of three types of probiotic powder, Lactobacillus, Bifidobacterium and Coccus, so as to provide guidance for the quality index control and application of probiotics powder. Lactobacillus acidophilus LA85, Lactobacillus plantarum Lp90, Lactobacillus rhamnosusLRa05, Lactobacillus casei LC89, Bifidobacterium lactis BLa80, Bifidobacterium longum BL21, Bifidobacterium breve BBr60, Bifidobacterium infantis BI45, Streptococcus thermophilus ST81, Pediococcus lactis PA53, Pediococcus pentosaceus PP06, Lactococcus lactis LLa61 were used as the research objects, and the survival rates of bacteria and protease activities were used as indicators to investigate the quality indicators of probiotic bacteria powder(moisture and water activity), storage temperature and encapsulation method on the cell survival rate and protease activity during storage. The moisture and water activity of the bacteria powder presented no significant effect on the storage survival rate and protease activity within a certain range(P<0.05). The storage survival rate and protease activity decreased significantly(P<0.05)with the increasing of moisture and water activity while beyond a certain range. Different storage temperatures(-18℃, 4℃, and 25℃)had significant effects on the storage survival rate and protease activity of bacterial powder(P<0.05). The survival rate of bacteria in vacuum encapsulation was better than that in ordinary encapsulation(P<0.05). The optimal moisture content of Lactobacillus, Bifidobacterium and Coccus powders, the quality control index of water activity, storage temperature and encapsulation method are determined to ensure the survival rate of probiotic powder during storage, and to provide guidance for the formulation and application of quality control standards for probiotic powder manufacturers.

Key words: moisture, water activity, Bifidobacterium, Lactobacillus, stability