Abstract
n-Butanol fermentation using Clostridium strains suffers from low titers due to the inability of the strains to tolerate n-butanol. The current study demonstrates a process to get high titer of n-butanol in a single batch mode from the renewable feedstock jatropha seed cake by employing Clostridium acetobutylicum. Chemical mutagenesis was done for improvement of the strain for better n-butanol tolerance and production. Optimization of the parameters resulted in 13.2 g L−1 of n-butanol in 120 h using acid-treated jatropha seed cake hydrolysate (7 % w/v) in anaerobic sugar medium. The process was scaled up to 15 L level, yielding 18.6 g L−1 of n-butanol in 72 h. The strain was found to be tolerant up to 30 g L−1 n-butanol under optimized conditions. The n-butanol tolerance was accompanied by over-expression of the stress response protein, GroEL, change in fatty acid profile, and ability to accumulate rhodamine 6G in the strain. The study has a significant impact on economically producing n-butanol from biomass.
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The authors gratefully acknowledge the encouragement and support of Reliance Life Sciences Pvt. Ltd. in carrying out the research work.
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Isar, J., Joshi, H. & Rangaswamy, V. n-Butanol Production from Acid-Pretreated Jatropha Seed Cake by Clostridium acetobutylicum . Bioenerg. Res. 6, 991–999 (2013). https://doi.org/10.1007/s12155-013-9332-5
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DOI: https://doi.org/10.1007/s12155-013-9332-5