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김상춘,김태영,이승렬,노승호,남기대 ( S . C . Kim,T . Y . Kim,S . Y . Lee,S . H . Roh,K . D . Nam ) 한국공업화학회 1994 공업화학 Vol.5 No.4
본 연구에 사용된 비이온성 계면활성제는 1-O-oleoyl glycerol, 2-O-oleoyl-myo-inositol 및 methyl 2-O-oleoyl-α-D-glucopyranoside였다. 이들 3종류의 비이온성 계면활성제에 대한 용액성질과 가용화과정은 상평형에 의하여 관찰하였다. 그 결과 계면활성제/물 2성분계와 3wt.%계면활성제/물/cyclohexane 3성분계는 각각 온도에 의존하는 것으로 나타났다. 계면활성제/물/cyclohexane계에서 3상영역은 27℃∼32℃, 36℃∼45℃와 38℃∼52℃의 온도 범위에서 각각 나타났으며 3상영역의 부근에서 물 및 오일의 가용화가 최대가 되었다. 계면활성제/물계의 온도변화에 따른 상거동을 살펴 본 결과 1-O-oleoyl glycerol은 hexagonal 액정상이, 2-O-oleoyl-myo-inositol 및 methyl 2-O-oleoyl-α-D-glucopyranoside는 lamella형태의 액정상이 관찰되었다. 1-O-oleoyl glycerol, 2-O-oleoyl myo-inositol and methyl 2-O-oleoyl-α-D-glucopyranoside were used as surfactants in this study. The solution properties and solubilization process of those nonionic surfactants were examined by the phase equilibria. As a result of this study, we have found that phase behavior of two component systems of surfactants/H₂O/cyclohexane depends on temperature respectively. The three phase regions of three component systems appeared in the temperature range of 27℃∼32℃, 36℃∼45℃and 38℃∼52℃ and solubilization of water and oil was high in those three phase ranges, As the temperature was varied in the two component systems, liquid crystals of hexagonal were observed to in the case of 1-O-oleoyl glycerol, and liquid crystal of lamella types were observed in the case of 2-O-oleoyl myo-inositol and methyl 2-O-oleoyl-α-D-glucopyranoside.
효소반응에 의한 장쇄 알킬모노글리세리드의 선택적 합성에 있어 동력학적 고찰
김상춘,김홍수,조경형,남기대 ( S . C,Kim,H . S,Kim,K . H . Joe,K . D . Nam ) 한국유화학회 1993 한국응용과학기술학회지 Vol.10 No.1
1,2-Isopropylidene glycerol produced by ketalyzation of glycerol with aceton was esterified with long chain fatty acids in the presence of a Mucor miehei lipase to obtain 1,2-isopropylidene 3-long chain acyl glycerol. To determine optimal conditions for the esterification reaction, esterification was proceeded as a reversible second-order reaction in various parameters that are enzyme/substrate ratio 0.096g/g at reaction temperatures ranged from 25℃ to 70℃. The order of reaction rate of fatty acids were lauric acid, myristic acid, oleic acid, and stearic acid. The range of their activation energies were from 7.8 to 11.4(kcal/mol) and that of entropies of activation which have negative values were from 42.8 to 52.5(e.u.).
피부 미용에 있어서 자외선 차단제의 개발 및 유효 안전성
김상춘,남기대,이향우 ( S . C . Kim,K . D . Nam,H . W . Lee ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.2
The ultraviolet blocking agents used to skineare are largely classified ultraviolet scattering agent and ultraviolet absorbent agents. There are UVC, UVB, and UBA in ultraviolet ray(UV) showing shorter wavelength than visible light. Both visible light and UVA give rise to 1st dark-skinned phenomena. On exposure of the skin to UV, phenomena of skin variation are termed sunburn or suntan. There are chronic and acute adverse reactions in skin response to UV. The latter is caused by UVB, which has mainly effects on the skin. But lately due to destruction of ozone layer, UVA has more serious irritation on the skin than UVB. In this paper spectrometric properties of UV absorbent agents such as PABA, octyl-PABA, Urocanic acid, and 2-hydroxy-4-methoxy benzophenone in vitro have been investigate. As results, it was found that the three fomer were more suitable than the last. UV scattering measurements on the sample used inorganic pigments showed that pigments containing titanium dioxide had a better scattering effects than the inorganic pigments such as Fe_2O_3, Al_2O_3, etc.