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병풀(Centella asiatica) 엑스-베타시클로텍스트린 고체 분산체를 함유한 폴록사머 407 히드로겔 제조 및 피부투과
김경국,곽은선,이계원,박진규,박목순,지웅길 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-
Extract of Centella asiatica(ECA), which is poorly water-soluble extract from the Centella asiatica is known to express excellent wound healing properties. ECA-β-cyclodextrin (asiaticoside-β-cyclodextrin and genin-β-cyclodextrin) solid dispersion system, which was prepared by freeze-drying method, was formulated as gels containing poloxamer 407 and propylene glycol, and evaluated with respect to their viscosity. stability, skin permeation and drug amount in the skin of hairless mouse. The average molar ratio asiaticoside-β-CD and genin-β-CD was 1:1,7 and 1:22, respectively. When the molar ratio of genin and β-CD was 1:5, madecassic acid made 100% solid dispersion system and asiatic and about 65%. In dissolution study, >99% of asiaticoside from asiaticoside-β-CD was dissolved in 5 minutes, and >99% madecassic acid and >64% asiatic acid from genin-β-CD. The apparent viscosity of poloxamer 407 gels with ECA-β-CD solid dispersion system increased in proportion to poloxamer 407 and gels showed that asiaticoside was most stable and madecassic acid stable and asiatic acid similar to stability of gel with free ECA. The permeation amount of asiaticoside in poloxamer gels through-hairless mouse skin decreased as the concentration of poloxamer 407 increased. When propylene glycol was added at the level of 10%, the permeation amount of asiaticoside at poloxamer gels through hairless mouse skin increased but from 15% it decreased. The permeation of asiaticoside into the skin of hairless mouse was estimated to be about 0.10 ㎍/㎠.
Azoloquinoxaline類의 간편한 合成에 관한 硏究 : 第1報
郭美玉,南順花,金恩慶,金眞姬,韓盛旭,李萬佶,朴義煥,金浩植 고신대학교 자연과학연구소 1993 고신대학교 자연과학연구소 논문집 Vol.3 No.-
The reaction of 2, 6-dichoroquinoxaline with m-chloroperbenzoic acid gave 2, 6-dichloroquinoxaline 4-oxide, whose reaction with sodium azide provided 7-chlorotetrazolo[1, 5-a]quinoxaline 5-oxide and not the isomeric azide. The structures of the synthesized compounds were confirmed on the basis of IR, ¹H-NMR, elemental analysis and mass spectral data.
Aspen Dynamics(TM)와 ACM을 이용한 용융탄산염 연료전지 시스템의 모사 및 제어
전경연 ( Kyoung Yein Jeon ),곽하연 ( Ha Yeon Kwak ),경지현 ( Ji Hyun Kyung ),이태원 ( Tae Won Lee ),문길호 ( Kil Ho Moon ),이기풍 ( Gi Pung Lee ),류아림 ( Ah Rim Yoo ),양대륙 ( Dae Ryook Yang ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.4
Recentincreasing awareness of the environmental damage caused by the CO2 emission of fossil fuelsstimulated the interest in alternative and renewable sources of energy. Fuel cell is a representative example of hydrogen energy utilization. In this study, Molten Carbonate Fuel Cell system is simulated by using Aspen(TM). Stack model is consisted of equilibrium reaction equations using ACM(TM)(Aspen Custom Modeler). Balance of process of fuel cell system is developed in Aspen Plus(TM) and simulated at steady-state. Analysis of performance of the system is carried out by using sensitivity analysis tool with main operating parameters such as current density, S/C ratio, and fuel utilization and recycle ratio. In Aspen Dynamics(TM), dynamics of MCFC system is simulated with PID control loops. From the simulation, we proposed operation range which generated maximum power and efficiency in MCFC power plant.
병풀(Centella asiatica)엑스 - 베타시클로덱스트린 고체 분산체를 함유한 폴록사머 407 히드로겔 제조 및 피부투과
지웅길,박목순,이계원,박진규,김경국,곽은선 한국약제학회 1998 Journal of Pharmaceutical Investigation Vol.28 No.1
Extract of Centella asiatica(ECA), which is poorly water-soluble extract from the Centella asiatica is known to express excellent wound healing properties. ECA-β-cyclodextrin (asiaticoside-β-cyclodextrin and genin-β-cyclodextrin) solid dispersion system, which was prepared by freeze-drying method, was formulated as gels containing poloxamer 407 and propylene glycol, and evaluated with respect to their viscosity, stability, skin permeation and drug amount in the skin of hairless mouse. The average molar ratio asiaticoside-β-CD and genin-β-CD was 1:1.7 and 1:22. respectively. When the molar ratio of genin and β-CD was 1:5, madecassic acid made 100% solid dispersion system and asiatic acid about 65%. In dissolution study. >99% of asiaticoside from asiaticoside-β-CD was dissolved in 5 minutes, and >99% madecassic acid and >64% asiatic acid from genin-β-CD. The apparent viscosity of poloxamer 407 gels with ECA-β-CD solid dispersion system increased in proportion to poloxamer 407 and propylene glycol concentration. In the accelerated stability test, all ECA-β-CD poloxamer 407 gels showed that asiaticoside was most stable and madecassic acid stable and asiatic acid similar to stability of gel with free ECA. The permeation amount of asiaticoside in poloxamer gels through hairless mouse skin decreased as the concentration of poloxamer 407 increased. When propylene glycol was added at the level of 10%, the permeation amount of asiaticoside at poloxamer gels through hairless mouse skin increased but from 15% it decreased. The permeation of asiaticoside into the skin of hairless mouse was estimated to be about 0.10㎍/㎠.