| Autor: |
de Santana JS; Institute of Biological Sciences, University of Pernambuco, Rua Arnóbio Marques, 310, Santo Amaro, Recife, Pernambuco, 50.100-130, Brazil., da Silva JL; Institute of Biological Sciences, University of Pernambuco, Rua Arnóbio Marques, 310, Santo Amaro, Recife, Pernambuco, 50.100-130, Brazil., Dutra ED; Research Group on Biomass Energy, Department of Nuclear Energy, Federal University of Pernambuco, 50740-540, Recife, PE, 50740-540, Brazil., Menezes RSC; Research Group on Biomass Energy, Department of Nuclear Energy, Federal University of Pernambuco, 50740-540, Recife, PE, 50740-540, Brazil., de Souza RB; Institute of Biological Sciences, University of Pernambuco, Rua Arnóbio Marques, 310, Santo Amaro, Recife, Pernambuco, 50.100-130, Brazil. rafael.souza@upe.br., Pinheiro IO; Institute of Biological Sciences, University of Pernambuco, Rua Arnóbio Marques, 310, Santo Amaro, Recife, Pernambuco, 50.100-130, Brazil. |
| Abstrakt: |
This study evaluated the bioproduction of 1,3-propanediol by Lactobacillus diolivorans in the medium based on agro-industrial residues and vegetal biomass substituting the MRS medium components. It was performed on a set of acid treatments and batch fermentations assays with crude glycerol (TCG) from biodiesel production, corn steep liquor (CSL), and cactus cladode hydrolyzate (CCH). Firstly, it was carried out on batch fermentation with different pure glycerol concentrations in MRS medium which was carried out, and the best condition achieved 4.66 g/L and 0.61 g/g of 1,3-PDO production and yield, respectively. Then, the TCG was evaluated, and a discrete increase of 1,3-PDO was observed. The replacement of the MRS medium nutrients by CLS was assessed, at different concentrations, for bacteria growth, and 5% of CLS reproduced the same biomass formation compared to the bacteria growth in MRS medium. It was also added cactus cladode hydrolyzate as the only sugar source, which showed a 1,3-PDO production close to the medium with pure glucose. Finally, a B-complex vitamin was added to the batch fermentation medium composed of TCG, CLS, and CCH, replacing all the costly MRS components. In this medium, the production of 1,3-propanediol was 6.57 g/L with a yield of 0.75 g/g. It means an increment of 29% and 19%, respectively, compared to MRS medium. Therefore, the combination of treated crude glycerol, corn steep liquor, and cactus cladode hydrolyzate has excellent potential for 1,3-PDO production by L. diolivorans. |
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