Abstract:
:The cost reduction of raw material and sterilization could increase the economic feasibility of l-lactic acid fermentation, and the development of an cost-effective and efficient process is highly desired. To improve the efficiency of open fermentation by Lactobacillus rhamnosus based on sweet sorghum juice (SSJ) and to overcome sucrose utilization deficiency of Bacillus coagulans, a mixed fermentation was developed. Besides, the optimization of pH, sugar concentration and fermentation medium were also studied. Under the condition of mixed fermentation and controlled pH, a higher yield of 96.3% was achieved, compared to that (68.8%) in sole Lactobacillus rhamnosus fermentation. With an optimized sugar concentration and a stepwise-controlled pH, the l-lactic acid titer, yield and productivity reached 121gL(-1), 94.6% and 2.18gL(-1)h(-1), respectively. Furthermore, corn steep powder (CSP) as a cheap source of nitrogen and salts was proved to be an efficient supplement to SSJ in this process.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Wang Y,Chen C,Cai D,Wang Z,Qin P,Tan Tdoi
10.1016/j.biortech.2016.07.069subject
Has Abstractpub_date
2016-10-01 00:00:00pages
1098-105eissn
0960-8524issn
1873-2976pii
S0960-8524(16)31048-3journal_volume
218pub_type
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