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Jung, Kwonsu,Kim, Woong,Park, Gwon Woo,Seo, Charles,Chang, Ho Nam,Kim, Yeu-Chun Springer-Verlag 2015 Applied microbiology and biotechnology Vol.99 No.7
<P>Response surface methodology (RSM) was used to optimize the production of volatile fatty acids (VFAs) and hydrogen from mixed anaerobic cultures of Saccharina japonica with respect to two independent variables: methanogenic inhibitor concentration and temperature. The effects of four methanogenic inhibitors on acidogenic processes were tested, and qualitative microbial analyses were carried out. Escherichia, Acinetobacter, and Clostridium were the most predominant genera in samples treated with chloroform (CHCl3), iodoform (CHI3), 2-bromoethanesulfonate (BES), or β-cyclodextrin (β-CD), respectively. RSM showed that the production of VFAs reached a peak of 12.5 g/L at 38.6 C in the presence of 7.4 g/L β-CD; these were the conditions under which hydrogen production was also nearly maximal. The quantitative polymerase chain reaction (qPCR) showed that shifts in the bacterial community population correlated with the concentrations of β-CD indicating that this compound effectively inhibited methanogens.</P>
Bioprocessing aspects of fuels and chemicals from biomass
Sun Uk Lee,장호남,Kwonsu Jung,Gwon Woo Park,Charles Seo,Yeon Ki Hong,홍원희 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7
This review deals with a recent development of biofuels and chemicals from biomass. Some of the grainbased biofuels and chemicals have already been in commercial operation, including fuel ethanol, biodiesel, 1.3-propanediol,polylactic acid (PLA) and polyhydroxy butyric acid/alkanoates (PHB/PHA). The next generation bioproducts will be based on lignocellulosics due to their abundance and to stabilize rising food prices. However, the technologies of handling biomass are yet in their infancy and suffer from low yield, low product titer, and low productivity. This review focuses on bioprocessing technologies for biofuels production: organic raw biomaterials available in Korea;volatile fatty acids platform, multi-stage continuous high cell density culture (MSC-HCDC), enrichment of fermentation broth by forward osmosis; various purification methods of pervaporation of ethanol, solvent extraction on succinic,lactic acids and reactive separation methods.