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RISS 인기검색어
- 검색키워드
- 저자 : 김윤설(Youn Seol Kim) (검색결과 3 건)
- 무료
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김윤설(Youn Seol Kim),정세준(Sei Joon Jeong),신화우(Hwa Woo Shin),김윤철(Youn Chul Kim) 대한약학회 1998 약학회지 Vol.42 No.2
One hundred and seventeen crude drugs were screened for DNA-binding activity in vitro. The DNA-methyl green assay is a useful biochemical screen for the detection or development of biologically active compounds which bind to DNA. This assay is based upon the fact that free methyl green undergoes rapid spontaneous molecular rearrangement to its colorless carbinol base so that the liberation of the dye from DNA by displacement can be followed spectrophotometrically as a decrease in absorbance at 65Onm. Seven methanolic extracts of crude drugs including Cinnamomi Cortex spissus, Coicis Semen, Coptidis Rhizoma, Perillae Semen, Plantaginis Semen, Polygalae Radix and Zanthoxyli Fructus showed less than 2,000mcg/ml as their IC50 values. The active principles of Plantaginis Semen and Zanthoxyli Fructus were transferred into organic solvents, which showed the IC50 values with 588 and 574mcg/ml, respectively. These fractions have been selected for isolation of biologically active constituents.
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신화우(Wha Woo Shin),김윤설(Youn Seol Kim),김준희(Jun Hea Kim) 대한약학회 1998 약학회지 Vol.42 No.2
Calcium hydrogen phosphate was synthesized by reacting calcium chloride and sodium hydrogen phosphate solution in this study. It is well known that the particle size and yield of calcium hydrogen phosphate produced is greatly affected by the synthetic conditions such as the reactant concentration, reaction temperature, reacting fine, mole ratio and drying temperature, etc. The purpose of this study is to investigate the optimum synthesis condition from the viewpoint of yield and sedimentation volume of the prepared calcium hydrogen phosphate powder according to a randomized complete block design proposed by G.E.P. Box and K.B. Wilson. It was found that the optimum synthetic conditions of calcium hydrogen phosphate were as follows: It was found that optirnum temperature range of reactant solutions was 28-38oC and 32-42oC respectively, on the viewpoint of yield and sedimentation volume. The optimum concentration range of reactant solutions was 5.5-10.0% and 6.9-7.4% respectively, on the viewpoint of yield and sedimentation volume. The optimum mole ratio of CaCl2 to Na2HPO4 was in the range of 1.2-2.0 and the optimum reacting time range was 8.5-11.0 minutes. The optimum drying temperature range was 39-41oC from the viewpoint of yield, but it was 39-43oC on the basis of sedimentation volume. Crystallographic analysis to X-ray diffraction patterns of commercially available ecalcium hydrogen phosphate and calcium hydrogen phosphate samples prepared in this study suggested that all samples tested belonged to monoclinic crystal system characteristic of CaHP042H20 crystals.
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신화우(Wha Woo Shin),김윤설(Youn Seol Kim) 대한약학회 1996 약학회지 Vol.40 No.6
Zinc white is mainly used as a mild astringent, protectant. and has weak antiseptic action. It is well known that the yield of zinc white produced is greatly affected by the synthetic conditions such as the reactant concentration, reaction temperature, washing water temperature, mole ratio of reactants, and drying temperature, calcination temperature, etc. The purpose of this study is to investigate the optimal synthesis conditions of zinc white produced. A randomized complete block design suggested by G.E.P. Box and K.B. Wilson was applied for this purpose. Basic zinc carbonate was prepared by reacting zinc sulfate and sod. carbonate solution in this study. Zinc white comes when prepared by calcination of basic zinc carbonate. The optimum synthesis conditions of zinc white obtained from this study is as follows: 1) The reacting temperature range is: 92-100oC, 2) The concentration of reactant solution is 23.6-27%. 3) The optimum mole-ratio: [ZnSO4]/[Na2CO3] is 1.74~1.96, 4) The washing water temperature is 36oC, 5) The drying temperature range is 68-74oC, 6) The calcination temperature is 600oC. The outcome of DSC indicated a desolvation of basic zinc carbonate occurred at about 133.3oC. The dehydration of the compound ceased at about 267.9oC and the decarboxylation ceased at about 379.9o. The physical and chemical properties of zinc white as medicine were studied by use of Volume Test.
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