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http://dx.doi.org/10.4014/mbl.1507.07007

Effect of Substrates and Lyoprotectant on the Survival Ratio of Lyophilized Bacillus sp. SH1RP8  

Hong, Sunhwa (Department of Environmental and Energy Engineering, The University of Suwon)
Sim, Jun Gyu (Department of Environmental and Energy Engineering, The University of Suwon)
Lee, Eun Young (Department of Environmental and Energy Engineering, The University of Suwon)
Publication Information
Microbiology and Biotechnology Letters / v.43, no.4, 2015 , pp. 385-390 More about this Journal
Abstract
In order to develop an eco-friendly biofertilizer, a plant growth promoting rhizobacterium (PGPR), Bacillus sp., SH1RP8 was investigated. SH1RP8 was lyophilized via freeze-drying along with other protective agents that protect cells from lysis. The freezedried powder of Bacillus sp. SH1RP8, containing 5% skim milk (w/v), exhibited the highest survival rate of 30.6% among all the protective agents (skim milk, glucose, and peptone). The lyoprotective effect of the skim milk, mixture including 5% skim milk, and substrates on the survival of the test strain was examined. Control group was added only skim milk and test groups were added skim milk and other substrates. As a result, the group supplemented with both glycerol and 5% skim milk showed the protective effect much higher by 214.29% than the control group. Freeze-dried Bacillus sp. SH1RP8 could be a good candidate as a potential biofertilizer due to its effective PGPR activity.
Keywords
Lyoprotectant; freeze drying; GP plate; substrates;
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