Formulation of Protective Agents for Improvement of Lactobacillus salivarius I 24 Survival Rate Subjected to Freeze Drying for Production of Live Cells in Powderized Form |
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Authors: | Lim Chi Ming Raha Abd Rahim Ho Yin Wan Arbakariya B Ariff |
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Affiliation: | (1) Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia;(2) Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia;(3) Laboratory of Industrial Biotechnology, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia; |
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Abstract: | The effectiveness of formulations using different protective agents to maintain viability of Lactobacillus salivarius I 24 during freeze drying for production of live cell in powdered form was investigated. The influence of prefreezing and
cultivation conditions on viability of cells after freeze drying was also studied. Surface methodology was used to determine
the most suitable combination of the protective agents. Concentrations of skim milk, sucrose, glycerol, and calcium carbonate
were selected as operating variables, and survivals of cultures after freeze drying were used as results. Skim milk and sucrose
were better protective agents than glycerol and calcium carbonate when used individually for preserving L. salivarius I 24 during freeze drying. Their protective abilities could be enhanced significantly when using them as a mixture (9.85%
w/v skim milk and 10.65% w/v sucrose). Prefreezing of the cells at −80°C for 5 h prior to freeze drying and cultivation with regulated pH and temperature
gave the highest cell viability. |
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