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용매추출에 의한 Propionic acid회수에 관한 연구
김재경,김영규,김태식,한상훈,박동원 東亞大學校 附設 環境問題硏究所 2004 硏究報告 Vol.26 No.-
We studied on the phase equilibrium of quaternary liquid-liquid extraction system containing propionic acid-water-binary solvents at 25℃, 1atm. o-Xylene and 1-butanol were used as binary solvents. Binodal curve, tie-line, distribution and selectivity for the quaternary system have been determined in order to investigate the effect of using binary solvent in extracting propionic acid from aqueous solution. And these experimental tie-line data were also compared with the values predicted by UNIFAC model. It was shown that UNIFAC model is capable of predicting the compositions in these quaternary systems within an average RMSD of 1.13mol%.
KIM, Young-Kwan,KIM, Ryung-Gue,PARK, So-Jung,HA, Joo-Hun,CHOI, Jong-Won,PARK, Hee-Juhn,LEE, Kyung-Tae WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2002 東西醫學硏究所 論文集 Vol.2002 No.-
In the present study, effects of various hederagenin monodesmosides isolated from the stem back of Kalopanax pictus NAKAI, such as hederagenin, δ-hederin, Kalopanxsaponin A, kalopanaxsaponin 1, and Sapindoside C, have keen evaluated on lipopolysaccharide (LPS)-induced nitric oxide(NO), prostaglandin E_2 (PGE_2) and tumor necrosis factor-α(TNF-α) release by the macrophage cell line RAW 264.7. Among the tested monodesrnosides, kalopanxsaponin A was the most potent inhibitor of NO production, and it also significantly decreased PCE_2 and TNF-α release. Consistent with these observations, the expression level of inducible N0 synthase (iNOS) and cyclooxygenase (COX)-2 enzyme was inhibited by kalopanxsaponin A in a concentration-dependent manner. Thus, this study suggests that kalopanaxsaponin A-mediated inhibition of iNOS, COX-2 expression, and TN-α release may be one of the mechanisms responsible for the anti-inflammatory effects of the stem bark of Kalopanax pictus NAKAI.