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앉은부채(Symplocarpus renifolius Schott) 뿌리의 성분
염정록,박동우,Youm, Jeong-Rok,Park, Dong-Woo 한국생약학회 1997 생약학회지 Vol.28 No.3
From the root of Symplocarpus renifolius, four compounds were isolated and their structure was elucidated by chemical and spectroscopic methods. They were identified as ${\beta}-sitosterol$ (compound 1), asparagine (compound 2), isocorydine (compound 3) and 3-hydroxymethyl-4-phenyl phenoxy carboxylic acid glucopyranosyl ester (compound 4). These compounds were firstly isolated from roots of Symplocarpus renifolius. Compound 4 was identified as a new compound, named as symplocarposide.
모노리틱 칼럼을 이용한 혈장 중 펜시클로버의 HPLC 신속분석법 개발 및 이를 이용한 생물학적동등성시험
염정록,김진희,박아연,정은하,이철우,이태호 한국분석과학회 2007 분석과학 Vol.20 No.4
A simple and rapid HPLC method with fluorescence detection(FLD) for quantitation of penciclovirin human plasma using a monolithic column was developed and validated. Penciclovir and ganciclovir(internalstandard, I.S.) were separated on a Chromolith column RP-18e (4.6×100 mm) with a mobile phase consisting(3/97, pH 2.5) and (B) methanol/50 mM sodium phosphate buffer containing 20 mg/L sodium dodecyl sulfate(50/50, pH 2.5) at a flow gradient of 1.6~4.0 mL/min. The retention times of penciclovir and internal standardwere less than 4.0 min. Calibration curve was linear (R2=0.9994) over a concentration range of 0.1~5 g/mL.. Corresponding authorPhone : +82-(0)2-820-5601, 5674 Fax : +82-(0)2-3280-5596E-mail: youmjr@cau.ac.kr324 .......................Analytical Science & TechnologyIntra-day precision, accuracy and inter-day precision were 1.36~8.55 %, 92.8~100.0 % and 0.93~5.62 %,respectively with a limit of quantitation at 0.1 g/mL. The present HPLC-FLD method is sensitive, preciseand accurate. The method described herein has been successfully used for the bioequivalence study of afamciclovir formulation product after oral administration to healthy Korean volunteers
alpha-치환 톨루엔 유도체의 13C NMR 화학 Shift
염정록(Jeong Rok Youm) 대한약학회 1988 약학회지 Vol.32 No.3
13C NMR chemical shifts for 18 alpha-susbstituted toluenes at high dilution in CCl4 solution have been determined. Substituents are as follows: H, Me, Et, n-Pr, iso-Pr, Ph, F, Cl, Br, NH2, NHMe, NMe2, OH, OMe, OCOMe, C02Me, C02Et, CN. Those chemical shifts of the methylene carbon of the toluene and the alpha-carbon of the n-butane systems are correlated well. (r=.975, slope=.962)
13C NMR 화학 Shift 측정에 미치는 TMS의 거동
염정록(Jeong Rok Youm) 대한약학회 1989 약학회지 Vol.33 No.3
A method is presented for calculating the 13C chemical shifts produced in liquid solution by referenced relative to RF frequency. The method is useful to get the real variations of chemical shifts in magnetic field by eliminating the affects of the variation of a reference substance.
Biphenyldimethyldicarboxylate 및 그 가수분해물의 온도에 의한 Chemical Shift의 거동
김진수,염정록 중앙대학교 약학연구소 1994 약학 논총 Vol.8 No.-
The temperature dependence of ^13C and ^1H nuclear magnetic resonance in biphenyldimethyldicarboxylate(PMC) and its hydrolysate have been investigated. The ^13C and ^1H chemical shifts of PMC and its hydrolysate is shown to be temperature dependent. Most of all, influence of its structure is the major factor on linear correlation between chemical shift and temperature. In solvent effect, PMC in CDCl_3 and DMSO-d_6 showed different chemical shifts and NMR spectrum patterns, respectively.
Kwon, Min-Chang,Youm,Jeong-Rok 중앙대학교 약학연구소 1996 약학 논총 Vol.10 No.-
A new sensitive and simple method for the rapid. simultaneous pretreatment of oxaprozin and its hydroxy oxaprozin metabolites, in human urine is described. Reversed-phase High-Performance Liquid Chromatography (HPLC) employed a Cosmosil C_18 column using acetonitrile-deionized water adjusted to pH 3.25 with acetic acid as a gradient mobile phase with ultraviolet detection at 280 nm. It is essential that urine is handled rapidly and acidified upon collection prior to freezing in order to stabilize the metabolites. Urine samples first are centrifuged and oxaprozin, hydroxy oxaprozin metabolites are initially isolated by solid-phase extraction on "Waters" C_18 disposable extraction columns for sample clean-up. Upon elution, the residue is evaporated, dissolved in indomethacin (internal standard) solution and injected onto the HPLC system. One of the metabolites of oxaprozin, hydroxy oxaprozin metabolites, extracted by SPE from urine was identified by electrospray ionization mass spectrometry. The above methods are satisfactory for the analysis of oxaprozin and its metabolites in human biological fluids.
박인철,염정록 중앙대학교 약학연구소 1992 약학 논총 Vol.6 No.-
The QSAR(Quantitative Structure-Activity Relationship) of twenty-five cephalosporins were studies to evaluate the importance of the permeability of cephalosporins through the cell wall of gram negative bacteria and the affinity of cephalosporins for cephalosporin binding protein. The permeability was affected by steric volume rather than hydropyobicity of cephalosporins and the antibiotic activity was affected by affinity rather than permeability. As a result, introduction of hydrogen binding group at 7B-acyl amino side chain a-carbon is essen-tial to new cephalosporins. In addition to, the imporvement of permeability of cephalosporins, which might be enhanced by introducing positive charge into molecule and reducing steric volume, is important.
박상희,염정록,장일무,Park, Sang-Hi,Youm, Jeong-Rok,Chang, Il-Moo 한국생약학회 1991 생약학회지 Vol.22 No.2
In the preceding paper, it was reported that total 63 traditional Korean herbal medicines listed in the Korean Pharmacopoeia and Korean Natural Drug Standards were found to be different plants in terms of systematic botany when those were compared with other two countries' drug compendia, Chinese Pharmacopoeia, Japanese Pharmacopoeia and Japanese Natural Drug Standards. Among 63 traditional Korean herbal drugs, 28 items were subject to the chemical identification test by using official methods that are described in the Korean Pharmacopoeia and the Korean Natural Drug Standards. In addition, 5 items were also tested by using the official methods described in Chinese and Japanese drug compendia, since there are no official chemical tests available in the Korean drug compendia. It was found that most of chemical tests appeared to be suitable. It was noted that the chemical test for Atractylodis Rhizoma(蒼朮) was incorrect and unapplicable. Those chemical tests for Clematidis Radix(威靈仙), Rubi Fructus(覆盆子) and Viticis Fructus(蔓荊子) are desirable to be revised for more accurate identification.
Enoxacin의 Dansyl 유도체에 의한 형광광도 분석법
이경준,염정록 중앙대학교 약학연구소 1990 약학 논총 Vol.4 No.-
A sensitive and specific method is described for the determination of a new secondary aromatic amine chemotherapeutic drug, Enoxacin. The highly fluorescent Dns-derivative of Enoxacin has been obtained by reacting ethanol solution of Enoxacin with Dns-Cl in acetone and sodium bicarbonate aqueous solution. The Dns-derivative is extracted with methylene chloride and its concentration is measured using a spectrofluorimeter in methanol solution(excitation wavelength : 415nm, emission wavelength : 535nm). The amount of Dns-Cl and 0.1M-NaHCO_3, reaction temperature, reaction time, stability of Dns-derivative and extraction solution were investigated to determine the quantitative potential of the method. Limit of detection is 0.1㎍ / ml with linear response up to 8㎍ / ml and 40㎍ / ml(as Enoxacin in methanol). The fluorescent labelled method is very stable and applicable to the determination of Enoxacin contained in pharmaceutical preparation.
은행잎중 Flavonol Glycoside 성분의 계절별 함량 변화에 관한 연구
강규선,염정록,강삼식,Kang, Gyu-Sun,Youm, Jeong-Rok,Kang, Sam-Sik 한국생약학회 1993 생약학회지 Vol.24 No.1
The seasonal variations of the major six flavonol glycosides(kaempferol 2,6-dirhamnosyl glucoside, quercetin 3-O-rutinoside, kaempferol 3-O-rutinoside, isorhamnetin 3-O-rutinoside, quercetin 3-O-coumaroyl glucorhamnoside and kaempferol 3-O-coumaroyl glucorhamnoside) in Ginkgo biloba leaves were investigated. The contents were determined by HPLC on reversed phase $C_{18}$ column. This result showed that the percentage of six flavonol glycosides decreased during the season from 1.57% in May to 0.39% in November. The content of each flavonol glycoside indicated a similar tendency to decrease. However, the contents of rutinosides of kaempferol, quercetin and isorhamnetin fluctuated markedly than those of coumaroyl glucorhamnosides of kaempferol and quercetin and kaempferol 2,6-dirhamnosyl glucoside.