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Conversion of glycerol by using electrochemically active strain, Klebsiella Pneumoniae L17 with ZVI
공다슬,김창만,김중래 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
1,3- PDO (1,3-Propandiol) is a highly value added product which is widely used as adhesives, laminates and food additives for three carbon sources. Sustainable and non-toxic regeneration of NADH is critical for efficient production of 1,3-PDO. Zero-Valent Iron(ZVI) can provide reducing equivalent for 1,3-PDO synthesis from glycerol as an electronic donor. Klebsiella Pneumaniae has 1,3-PDO production pathway from glycerol, and has been extensively investigated as exoelectrogens. In this study, we attempt to produce 1,3-PDO from glycerol by using a electrochemically active strain, K. pneumoniae L17. The results showed significant increase of 1,3-PDO production using the ZVI. It seems that unidentified component in a crude glycerol may bring synergetic effects for both cell biomass and 1,3-PDO production. These results implicate that ZVI can regulate the bioconversion of elec troactive strain such as L17, therefore improve crude glycerol conversion into value-added platform chemicals.
임현성,공다슬,Chae Ho Im,김창만,송영은,오상은,김중래 한국생물공학회 2023 Biotechnology and Bioprocess Engineering Vol.28 No.5
The use of carbon monoxide (CO) as a valuable feedstock for producing various platform chemicals through biorefinery processes has attracted considerable research interest. Acetate is an intermediate chemical synthesized from CO and CO2 through acetogenesis via the Wood– Ljungdahl pathway. Acetate can further serve as a substrate for chain elongation into a higher volatile fatty acid (VFA) when sufficient reducing power is provided. Zero-valent iron (ZVI) is used widely as a reducing agent in environmental remediation applications. This study established that the externally provided reducing power from ZVI oxidation increased the acetate production (approximately 13 times) from CO and the further synthesis of VFA. The effect of ZVI on CO/CO2 conversion was evaluated by quantifying the formation of acetate and butyrate. The carbon and electron balance provide information on the mechanism of C1 gas conversion and chain elongation. These findings highlight a useful intermediate production under the reducing power-limited bioprocesses, such as C1 gas bioconversion.