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분리기술 열역학 : Stirred Cell 안에서 BSA 의 흡착 과정에 의해 응집된 Microsphere 가 투과 Flux 에 미치는 영향 고찰
최성욱(Choi Sung Wook),윤정열(Yoon Jeong Yeol),함승주(Haam Seung Joo),정준기(Jung Joon Ki),김우식(Kim Woo Sik) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.1
A study on permeate flux variation in the filtration of BSA-adsorbed microspheres was performed, to investigate the effects of the stirs speed (300, 400 and 600 rpm) and the concentration of BSA solutions (0.1, 0.2 and 0.4 g/L). The permeate flux was increased with time until the Weak point, but after that point. This is in contrast to the observation from the conventional filtration. It could be explained that the microspheres which were adsorbed by BSA agglutinated each other, and resulted in the increase of effective particle diameter of BSA-adsorbed microsphere. It is well known that the large-sized substances make flux increase. When BSA`s were saturated on the surface of microspheres, they permeated through membrane and some of them absorbed inside the pore of membrane, resulting in the flux decline as observed in the general filtration. The period of flux increase was shortened with an increase in the concentration of BSA solution and permeate flux was increased with a increase in the stirrer speed.
Alcaligenes latus 에 의한 PHB 의 생합성에 관한 연구
조근도(Geun Do Cho),윤정열(Jeong Yeol Yoon),오준택(Joon Taek Oh),김우식(Woo Sik Kim) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.3
Culture conditions for the optimum growth and biosynthesis of PHB in Alcaligenes latus DSM 1123 were investigated. Optimum carbon and nitrogen sources and their concentrations for growth were determined, and batch and fed-batch fermentations were performed in a 2.5 L jar type aerobic fermenter with various pH control solutions. Sucrose and (NH₄)₂SO₄ were found to be the most effective carbon and nitrogen sources for the growth of A. latus, respectively. Optimum C/N ratio was found to be varied with the concentrations of carbon and nitrogen sources. The maximum specific growth rate was obtained at the sucrose concentration of 30 g/L and C/N ratio of 30. The specific growth rate increased more than two times and lag time was reduced when yeast extract and polypeptone were added. PHB could be synthesized in the logarithmic growth phase. By using NH₄OH and NaOH solutions in the first and second stage as pH control solution, significant increases in the specific growth rate, biomass and PHB concentrations were observed. Under the optimal conditions, the maximum biomass and PHB accumulation yield(Y_(P/X) attained after 40 hours were 17.6 g/L and 46 %, respectively.
RELATIONSHIP OF INTERACTION FORCES IN PROTEIN ADSORPTION ONTO POLYMERIC MICROSPHERES
김우식,김중현,윤정열 한국공업화학회 1997 응용화학 Vol.1 No.2
The aim of this work is to investigate the relationship of interaction forces in the protein adsorption onto polymeric microspheres. In our previous study, the relationship between hydrophobic and hydrogen bonding interactions was studied with the carboxylated microspheres. When the amont of surface carboxyl groups was small, hydrophobic interaction predominated over hydrogen bonding, and when it was large, hydrogen bonding did. The transition point was observed when the two forces were exactly balanced. In this time, the relationship between hydrophobic and electrostatic interactions was investigated with the sulfonated microspheres. Just as the previous results showed, hydrophobic interaction governed the adsorption in the low sulfonated microspheres and electrostatic interaction did in the high sulfonated ones. However, the transition point was shifted to the left. In case there existed only one interaction force, the adsorbed amount was in the following order: electrostatic > hydrogen bonding > hydrophobic.