Production and productivity of 1,3-propanediol from glycerol by Klebsiella pneumoniae GLC29

• Autor(a) principal: Da Silva, Gervásio Paulo
• Data de Publicação: 2015
• Outros Autores: De Lima, Cristian J. Bolner [UNESP], Contiero, Jonas [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.cattod.2014.05.016; http://hdl.handle.net/11449/172080
• topic: 1,3-Propanediol; Biodiesel; Fermentation; Glycerol; Klebsiella pneumoniae GLC29

Interest in the development of the bioproduction of 1,3-propanediol, an important chemical intermediate with various industrial applications, has increased in recent years. Klebsiella pneumoniae is one of the most studied and efficient bacteria for 1,3-propanediol production from glycerol. A new isolate of K. pneumoniae was investigated using response surface methodology by central composite design for the production of 1,3-propanediol using glycerol. The effects of pH, temperature, stirrer speed, and glycerol concentration on the production and productivity of 1,3-propanediol were examined. Considering both production and productivity, the best conditions for glycerol conversion in 1,3-propanediol are: a pH range of 6.9-7.1, a temperature between 33 and 38.5°C, a stirrer speed of 110-180 rpm, and a glycerol concentration of 39-49 g l^-1. Batch fermentation carried out at a pH of 7.0, a temperature of 35°C, a stirrer speed of 150 rpm, and a glycerol concentration of 40 g l^-1 produced 20.4 g 1,3-propanediol l^-1, with a maximum volumetric productivity of 2.92 g l^-1 h^-1 and a yield of 0.51 g g^-1. The main byproducts were acetic acid (approximately 7.0 g l^-1) and formate (approximately 3.7 g l^-1). The newly isolated K. pneumoniae GLC29 showed potential for the conversion of glycerol into 1,3-propanediol, with high production and productivity.