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Thinlayer Chromatography 및 Oxygen Combustion Flask Method에 의한 유기유황약품의 분리정량
백남호(Nam Ho Paik),김박광(Bak Kwang Kim) 대한약학회 1969 약학회지 Vol.13 No.2,3
Microanalysis of organic sulfur compounds by means of combining thin layer chromatography and oxygen combustion flask method was attempted. The following procedure was found to be very simple and to give accurate results. The mixture of sulfa drugs was separated with T.L.C., and it was burned in a flask filled with oxygen, and the gas formed was absorbed in a dilute solution of sodium hydroxide. The solution was neuralized with hydrochloric acid and heated in a water bath. The sulfate ion formed was then treated with barium chromate solution and its absorbency at 370mmc was measured.
ORD 및 CD에 의한 Tropane Alkaloid의 정량에 관한연구(I)
백남호(Nam Ho Paik),박만기(Man Ki Park),염정녹(Jeong Rok Youm),김예숙(Ye Sook Kim) 대한약학회 1979 약학회지 Vol.23 No.3,4
The ORD and CD for hyoscine-N-butylbromide present curves of negative Cotton effect in 190~250nm region. The values of alpha232, alpha2O8, |alpha232|+|alpha2O8| and theta221.5 have linearities in the range of lower concentration (hyoscine-N-butylbromide 0.01-0.lw/v%). It is possible to determine the optical purity of hyoscine-N-butvlbromide by using these linearities. This experiment is extremely simple and less time-consuming than other methods for estimating optical purity.
alpha-Picolin 동에 의한 Aspirin의 용매 흡광도 정량법
백남호(Nam Ho Paik),박만기(Man Ki Park) 대한약학회 1969 약학회지 Vol.13 No.2,3
Acetylsalicylic acid gives a water-insoluble violet complex with alpha-Picolin-Cu(II) reagent. The Complex is extractable well with a mixture of alpha-Picolin-tetrachloromethane solution. the Complex salt dissolved in the mixed solution shows a maximum absorption at 620mmc. It has a melting point at 171oC-173oC and molar ratio of Acetylsalicylic acid: Cu(II): alpha-Picolin was estimated as 2:1:2 by continuous variation method and chelate titration method.
1-Isonicotinoyl-2-furfurylidene Hydrazine-Cu(II) 착화합물에 관한 분석화학적연구
백남호(Nam Ho Paik),최윤수(Yun Soo Choi) 대한약학회 1965 약학회지 Vol.9 No.1,2
A new organic reagent, 1-isonicotinoyl-2-furfurylidene hydrazine was synthesized from isonicotinic acid hydrazide and furfural, gives precipitate with copper(II), mercury(II) and argent(I), whereas, it gives a water soluble yellow complex with iron(III). Copper complex of the reagent is soluble in EtOH, MtOH, pyridine, dioxane and dimethylformamide with green yellow coloration. The complex has a maximum absorption at 385mmc and molar ratio of copper: reagent was estimated as 1 : 1 by continuous variation method, slop method and chelate titration method. Molar extinction coefficient (9600) and apparent formation constant of this complex was spectrophotometrically determined. K=1.7 X 107 (Babko''s method) K=2.1 X 107 (Anderson''s method). This reagent reacted with copper so sensitive that it would be available for determination of Cu (II).
흑연로 원자흡광분석법에 의한 생약중의 Germanium 함량에 관한 연구
백남호(Nam Ho Paik),이왕규(Wang Kyu Lee),박만기(Man Ki Park),박정일(Jung Il Park) 대한약학회 1979 약학회지 Vol.23 No.3,4
Germanium in various botanical drugs was determined by flameless atomic absorption spectrophotometry with a graphite tube atomizer. The amounts of Ge in Zingiberis Rhizoima and Angelicae Radix were 169mcg/g and 146mcg/g, respectively. The amounts of Ge in some other drugs ranged from 70mcg/g to 130mcg/g. There is much more Ge in botanical drugs than in foods.
Tris(1, 10-Phenanthroline) Fe(II) Chelate에 의한 Undecylenic Acid의 흡광광도 정량법
강삼식(Sam Sik Kang),백남호(Nam Ho Paik) 대한약학회 1972 약학회지 Vol.16 No.4
A new spectrophotometric method was established for the determination of undecylenic acid. The method is based on the solvent extraction into nitrobenzene of the ion pair formed between tris(1, 10-phenanthroline)Fe(II) chelate and the anion of undecylenic acid. The maximum absorbance of the extract in the organic phase was at 518nm. A maximum extraction was obtained at pH 9~11, when excess of at least 50-fold(molar) of the phenanthroline-Fe(II) chelate to undecylenic acid was present. The color intensity of the extracted species remained constant at room temperature for the several hours after separation of the organic layer. A linear relationship was obtained over the tested range of 5~20gamma/ml of undecylenic acid. The effect of several other fungicids on this method was investigated. The method was applied to the determination of undecylenic acid in preparations and the results were in good agreement with those added amounts.
白南豪 서울대학교 1965 서울대학교 論文集 Vol.16 No.-
To the samples of mercuric chloride and ammoniated mercury, we add quantitatively certain excess of KI solution for solution of them. Here, when the sample is HgI_2, we can make a back titration with 0.1 M HgCl_2 solution till the feeble red color of HgCl_2 is appeared; and when the sample is HgNH_2Cl, we neutralize it, till it becomes colourless, with about 0.1 N HCl solution, using phenolphthalein as the indicator. After the neutralization, a back titration can be also performed with 0.1 N HgCl_2 solution. When a blank test is carried on of KI solution of same concentration and same volume, the quantitative analysis can easily be made with good accuracy, on the basis of the findings of the back titration and blank test.
白南豪,韓龍男 서울대학교 1973 서울대학교 論文集 Vol.23 No.-
Naphazoline and tetrahydrozoline react with bromophenol Blue in pH6.6 to give blue color, being extracted into n-butylalcohol-chloroform (1:4). The absorption maximum of the colored solution obtained by the recommended standard procedure is at 607mμ. The method has advantages in pharmaceutical preparations than Mattson's method,^5) in which addition product with BPB (in pH 4.0) was interfered by amines compounded in mixed preparations, such as chlorpheniramine maleate.
白南豪,朴富植 서울대학교 1972 서울대학교 論文集 Vol.22 No.-
In an acidic solution caffeine reacts with phosphomolybdenic acid to form a yellow precipitate, which can be extracted with diethyl ether and then readily reduced by 5% stannous chloride solution to form a molybden blue, showing the absorbance maximum at 623mμ. By adjusting the concentration of hydrochloric acid caffeine phosphomolybdate can be extracted and separated from the unreacted polyheteroacid, and caffeine is measured quantitatively by the spectrophotometric determination of molybden blue.