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조경열,최윤수,석경순 대구효성가톨릭대학교 1986 연구논문집 Vol.32 No.1
A new spectropotometric determination of citric acid was examined using carbonyldiimidazole (CDI) which has been used in petide synthesis. CDI was reacted with citric acid to form yellow acyl-imidazole derivative (λ??443nm) in dichloroethane. This colored reaction was so characteristic with tricarboxylic acid that can be used selective determination of citric acid in common carboxylic acid. As increasing the reaction temperature, the acyl compound was decomposed to produce the substance of which physical property was similar to the hydrolized compound. Citric acied was calibrated in the range of 1-6μg/ml and the extinction coefficient of the acyl-imidazole compound was 28000 in this condition.
Nitrofurazone의 光分解에 關한 硏究(第一報)
崔閏壽,石敬順 대구효성 가톨릭 대학교 1988 연구논문집 Vol.36 No.1
The photodecomposition mechanism of nitrofurazone was investigated in several solvent systmes such as water, methanol and ethanol solution. On irradiation with light, the pH of nitrofurazone solution was changed with releasing of protons from nitrofurazone, primarily, and photodecomposition is followed to produce a new product having absorption maximum at 210nm finally. It seemed, however, that the photodecomposition process may be varied depending on various solvent systems. In the case of ethanol and acidic methanol system, new reversible and transitional states were appeared at 430nm and 530nm, and these absorption peaks were diminished gradually. RNA and uracil facilitated the decomposition of nitrofurazone. It suggested that the nucleotide can react with thes photodecompositional intermediates of nitrofurazone to occur the cutaneous responses.
Nitrofurazone 의 光分解에 關한 硏究(第二報)
최윤수,석경순 대구효성가톨릭대학교 자연과학연구소 1989 基礎科學硏究論集 Vol.3 No.-
Nitrofurazone is decomposed by light of UV-A region to form a stable product which has an absorption maxima at 210nm (UVλmax.210) The process is an acid catalysed reaction, and during the early decomposing stage, compounds having an absorption maxima at 420nm(UVλmax.420) and 530nm (UVλmax 530) are formed as intermediates. Each intermediate cha-nges to the final compound of UVλmax210 via respective pathways. UVλmax420 and UVλmax530 are seperated by TLC, HPLC and column chromatography, and the multiplicities of the excited state of the intermediates are examined. UVλmax 530is very unstable on heat, stable in acid. Both compounds are triplet sensitized by benzophe-none to be decompose very rapidly. In the NMR spectrum, the dissociation and the exchange of protons on the imino group are observed and it is identified that a radical formation on the hetero ring may occur
최윤수,석경순,최요인 대구효성가톨릭대학교 자연과학연구소 1990 基礎科學硏究論集 Vol.4 No.-
The maximum UV absorption spectra(λmax) of nitrofurazone was measured in several polar solvent systems. As the dipole moments of solvents are increased, the UV λmax of alkaline nitrofurazone(π→π*)were shifted to red than neutral of species(π→π*)and the equilibrium constants of them were increased. The structure of alkaline nitrofurazone was studied by UV, IR and NMR spectra. It was found that the keto group of nitrofurazone was changed to enolic form caused by proton migration. The new determination method of nitrofurazone was established in alkaline solution and it was more sensitive than other spectrophotmetries.
최윤수,석경순,이경선 대구효성가톨릭대학교 응용과학연구소 1994 응용과학연구논문집 Vol.3 No.-
We investigated the photodegradation of pefloxacin(PFX) in some conditions. Pefloxacin was decomposed by light with different patterns in several solvents-ethanol, methanol and water. In the neutral and alkaline the rate of photo-degradation was more rapid than in acidic. When oxygen was replaced to N_2 gas, we found that it prevent pefloxacin from photodegrada-tion. Using the singlet oxygen scavenges-sodium azide and α-tocopherol, we obtained an indica-tive evidence of that photo-degradation pathway is mediated by singlet oxygen.
최윤수,석경순,이경선,전숙경 대구효성가톨릭대학교 1992 연구논문집 Vol.45 No.1
Oenothera odorata Jacquin(Onagraceae), native to south America, is naturalized and grows wild in Korea. The seed oil, named evening primerose oil, of this plants is used for prophylacsis of adult disease. From the roots of this plant, β-sitosterol, β-sitosterol-3-O-D-glucopyranoside and asiatic acid were isolated. The structures were elucidated by spectrometric methods and chemical transformation.
Ascorbic Acid 에 의한 Nitrofurazone의 환원에 관한 연구
최윤수,석경순 대구효성가톨릭대학교 자연과학연구소 1989 基礎科學硏究論集 Vol.3 No.-
Nitrofurazone, an antibacterial and antiseptic agent, is reduced by nitroreductase or by thiol compounds, such as cysteine and reduced-glutathione(GSH). Metabolic intermediates of nitrofurazone, produced by them, are known as cytotoxic and mutagenetic by binding with protein and DNA etc. Nitrofurazone is also reduced by ascorbic acid in vitro. The redox reaction between nitrofu-razone and ascorbic acid was performed at pH 4.1 and 37℃The reaction is promoted by Fe3+ion. Under those conditions, the reduction of nitrofurazone was followed pseudo-firstorder reaction and the rate constant was found as 1.9×10-5S-1.On the reducing process of nitrofurazone, therefore ascorbic acid may be related to accele-rating toxic reaction of nitrofurazone in vivo.
최윤수,조경열,석경순 대한약학회 1985 약학회지 Vol.29 No.3
A clorimetric determination method of pyruvic acid using hydroxylamine was studied. Hydroxylamine was reacted with pyruvic acid to form complex compound in the presence of Cu(II) ion. Optimal conditions for the quantitative analysis were investigated and the structure of complex was examined spectrometrically. The molar ratio (2:1) and the stability constant ($1.88{\times}10^{4}$) of the complex were measured. It was the characteristic feature of this method that the commonly encountered interfering substances such as fructose, glucose and lactic acid do not infuence the measurement of pyruvic acid.
금호강수계 수질과 하천유역의 토양 및 농작물의 중금속루 오염에 관한 연구(II)
金相烈,李萬正,趙康烈,崔閏壽,石敬順,禹美姬,李蘭姬 대구효성 가톨릭 대학교 1984 연구논문집 Vol.29 No.2
Soil are mostly sandy and it has a little clay below 10%. In the fine sand fraction, quartz, plagioclase and alkali-feldspar are dominant in almost all samples. Small amounts of altered-feldspar, muscovite, biotite, hornblende and plant opal are present in some samples. They are mainly derived from weathering prodructs df granite, granodiorite and arkose or is mixture. The clay minerals are mainly expanding or nonexpanding 14A˚minerals, illite and kaolin minerals. Nonexpanding 14A˚minerals seems to be dioctahedral vermicurite which sandwiches gibbsite or chlorite.