文献类型：期刊文献

英文题名：Influences of 3-hydroxypropionaldehyde and lactate on the production of 1,3-propanediol by Klebsiella pneumoniae

作者：Zhong, Zhihui[1]; Liu, Longfei[1]; Zhou, Jiajia[1]; Gao, Lirong[1]; Xu, Jiajie[1]; Fu, Shuilin[1]; Gong, Heng[1]

机构：[1] State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

年份：2014

卷号：1

期号：1

外文期刊名：Bioresources and Bioprocessing

收录：EI(收录号：20224513087504)

语种：英文

外文关键词：Bacteria - Glycerol

摘要：Background: 1,3-Propanediol is the starting point of a new-generation polymer with superior properties which can be used in many industrial fields. 3-Hydroxypropionaldehyde and lactate have been identified as two important metabolites in the biological route of 1,3-propanediol bioconversion from glycerol. Here, influence of lactate on the inhibition caused by 3-hydroxypropionaldehyde of 1,3-propanediol fermentation by Klebsiella pneumoniae is reported. Methods: The influences of 3-hydroxypropionaldehyde and lactate on 1,3-propanediol production were investigated in normal and lactate pathway deficient strains with different fermentation conditions. Results: By using the strains KG1 and L-type lactate dehydrogenase-deficient mutant (KG1Δldh), the results indicated that an early accumulation of 3-hydroxypropionaldehyde directly inhibited the 1,3-propanediol production rather than through lactateaccumulationduringthelatestage of fermentation. Then, the influence of extra addition of lactate on the late stage of fermentation was investigated, and the inhibitory effect of lactate did not appear. At last, it was found that by reducing 3-hydroxypropionaldehyde accumulation in the early stage of fermentation, the concentration and yield of 1,3-propanediol increased by 18% and 16%, respectively, over the initial experimental levels. Conclusions: An early accumulation of 3-hydroxypropionaldehyde directly decreased the final 1,3-propanediol concentration rather than through lactate accumulation during the late stage of fermentation. ? 2014 Zhong et al.