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Production of 1,3-propanediol from glycerol using the newly isolated Klebsiella pneumoniae J2B

Durgapal, Meetu, Kumar, Vinod, Yang, Taek Ho, Lee, Hee Jong, Seung, Doyoung, Park, Sunghoon
Bioresource technology 2014 v.159 pp. 223-231
Klebsiella pneumoniae, carbon, glycerol, lactic acid, lipopolysaccharides, metabolites, mutants, toxicity
Recently, novel Klebsiella pneumoniae J2B, which grows rapidly on glycerol as the carbon source without forming pathogenic and sticky lipopolysaccharides, was isolated. Current study examined the ability of K. pneumoniae J2B to produce 1,3-propanediol (PDO) from glycerol. To this end, a deletion mutant for lactate formation was constructed. The ldhA mutant strain produced negligible lactate but more 2,3-butanediol (BDO). When K. pneumoniae ΔldhA was cultivated in glycerol fed-batch mode, the PDO titer of 58.0g/L with a yield of 0.35g/g and an overall volumetric productivity of 1.3g/L/h were obtained. BDO was the main byproduct (26.6g/L). Less than 10g/L of the other metabolites was produced. As PDO and other metabolites accumulated, the rate of PDO production decreased significantly due mainly to the toxic effects of these metabolites. This study highlights the potential of newly isolated K. pneumoniae J2B for the production of PDO from glycerol.