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  • Title: Production of 2,3-butanediol by Klebsiella pneumoniae BLh-1 and Pantoea agglomerans BL1 cultivated in acid and enzymatic hydrolysates of soybean hull.
    Author: Cortivo PRD, Machado J, Hickert LR, Rossi DM, Ayub MAZ.
    Journal: Biotechnol Prog; 2019 May; 35(3):e2793. PubMed ID: 30815989.
    Abstract:
    We investigated the production of 2,3-butanediol by two enterobacteria isolated from an environmental consortium, Klebsiella pneumoniae BLh-1 and Pantoea agglomerans BL1, in a bioprocess using acid and enzymatic hydrolysates of soybean hull as substrates. Cultivations were carried out in orbital shaker under microaerophilic conditions, at 30°C and 37°C, for both bacteria. Both hydrolysates presented high osmotic pressures, around 2,000 mOsm/kg, with varying concentrations of glucose, xylose, and arabinose. Both bacteria were able to grow in the hydrolysates, at both temperatures, and they efficiently converted sugars into 2,3-butanediol, showing yields varying from 0.25 to 0.51 g/g of sugars and maximum 2,3-butanediol concentrations varying from 6.4 to 21.9 g/L. Other metabolic products were also obtained in lower amounts, notably ethanol, which peaked at 3.6 g/L in cultures using the enzymatic hydrolysate at 30°C. These results suggest the potential use of these recently isolated bacteria to convert lignocellulosic biomass hydrolysates into value-added products.
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