• 제목/요약/키워드: Ion chromatography system

검색결과 115건 처리시간 0.047초

Euphorbia lathyris에서 분비되는 Latex 65kD 단백질의 특성규명 (Characterization of 65 kD Protein in Latex Excreted from Euphorbia lathyris)

  • 박희성
    • Journal of Plant Biotechnology
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    • 제31권4호
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    • pp.319-323
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    • 2004
  • Euphorbia lathyris의 유관세포로부터 분비되는 수용성 latex단백질을 10% SDS-polyacrylamide 전기영동으로 분리하여 특징적으로 잘 나타나고 있는 ELp65, ELp55, ELp43, ELp32 그리고 ELp23 등의 주요단백질을 확인하였다. 이들 latex 주요단백질들 중에서 ELp65는 ammonium sulfate 침전, gel permeation chromatography 그리고 ion exchange chromatography 등의 방법으로 순수 분리하였는데 ELp65의 N-terminal amino acid 서열분석에 의하면 이는 토마토의 p69a subtilisin-like pretense의 mature peptide의 앞부분과 강한 유사성을 지니고 있었으며 식물방어와 관련된 기능이 제시되었다. PCR증폭에 의하여 클로닝된 토마토의 p69a DNA를 probe로 이용하여 Southern blot hybridization을 수행한 결과 E. lathyris genome은 토마토의 subtilisin-like proteases와 유사한 정보를 지닐 수도 있는 3-5 유전자들로 구성된 gene family가 분석되었다.

IC-MS/MS를 이용한 수중의 과염소산이온 분석방법 최적화 및 한강수계내 분포조사 (Determination of Trace-Level Perchlorate by IC-MS/MS and Distribution in the Han River)

  • 김현희;한인섭;정관조;박현;한선희;조완선
    • 대한환경공학회지
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    • 제32권4호
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    • pp.349-356
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    • 2010
  • 과염소산이온의 분석을 위해 전기전도도 검출기(CD; conductivity detector)를 연결한 이온크로마토그래피(IC; ion chromatography) 방법이 지금까지 가장 널리 사용되어 왔다. 그러나 이 방법은 시료의 조성에 영향을 받을 수 있고, 정량한계를 낮추는데 한계가 있다. 따라서, 본 연구에서는 미량의 과염소산이온 분석을 위해 이온크로마토그래피 질량분석법(IC-MS/MS; ion chromatography mass spectrometry)을 제시하였다. IC-MS/MS를 이용한 과염소산이온의 분석방법을 적용한 결과 평균회수율 104.4 ${\pm}$ 5.7%, 상대표준편차 1.9 ${\pm}$ 1.3%를 얻었으며, 검출한계(MDL; method detection limit)는 0.0207 ${\pm}$ 0.0099 ${\mu}g/L$를 얻을 수 있었다. IC-MS/MS를 한강수계 지류천과 본류에 적용시킨 결과, 최소 <0.1 ${\mu}g/L$에서 최고 18.30 ${\mu}g/L$ 범위로 나타났다. 서울시 6개 아리수정수센터의 취수원수와 정수에서는 과염소산이온이 0.18~0.34 ${\mu}g/L$의 농도로 존재하는 것으로 나타났다.

Simultaneous Determination of Benzoic Acid, Caffeic Acid and Chlorogenic Acid in Seeds of Eriobotrya japonica and their Antibacterial Effect

  • Jeong, Jun-Mo;Lee, Kyoung-In;Kim, Sun-Min
    • Journal of Applied Biological Chemistry
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    • 제57권1호
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    • pp.89-93
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    • 2014
  • We aim to develop a simple method for simultaneous and quantitative determination of benzoic acid, caffeic acid and chlorogenic acid in seeds of Eriobotrya japonica. In addition, antibacterial effect of these three phenolic acids was examined. A basic method is performed on the high performance liquid chromatography system coupled to an UV-detector (230 nm) and reverse phase C-18 column ($4.6{\times}150mm$, $5{\mu}m$). Each phenolic acid was confirmed via liquid chromatography-mass spectrometry (MS)/MS system under the multiple-reaction monitoring with negative-ion electrospray ionization (ESI(-)) mode. It is demonstrated that the method was could be applied to samples for an analytical study of the phenolic acids. On the other hand, three phenolic acids in seeds of E. japonica exhibited antibacterial effect against several pathogenic bacteria. Of these, benzoic acid was found to have stronger antibacterial effect.

가스크로마토그래피 질량분석기의 질량 스펙트럼 해상도 개선 알고리즘 (Algorithm to Improve Mass Spectral Resolution of Gas Chromatography Mass Spectrometer)

  • 최훈
    • 전기학회논문지
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    • 제67권9호
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    • pp.1232-1238
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    • 2018
  • This paper proposes methods for improving mass spectral resolution for a gas chromatograph mass spectrometer. The slope signs of the 1st and 2nd fitting functions for the ion signal block of each mass index are obtained, and the unnecessary element signals in the ion signal block are removed. The spectrum can be obtained by obtaining the second-order fitting function of the reconstructed ion signal block using only the effective ion signals. In addition, the resolution of the mass spectrum can be improved by correcting the error caused by the shift of the spectral peak position. To verify the performance of the proposed methods, computer simulations were performed using the actual ion signals obtained from the GC-MS system under development. Simulation results show that the proposed method is valid.

후세척-이온크로마토그래피를 이용한 형석 광산 폐수 중 플루오라이드 정량 (Determination of fluoride in fluorite mine wastewater by ion chromatography with post-wash technique)

  • 송경선;음철헌;김상연
    • 분석과학
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    • 제19권5호
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    • pp.383-388
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    • 2006
  • 간단한 후세척의 이온 크로마토그래피를 이용하여 형석 광화대 지역의 광산 폐수에서 플루오라이드 이온을 빠르고 정확하게 정량하는 방법을 확립하였다. 시료중의 높은 농도의 황산 이온은 전치 컬럼(pre-column)에 머물러있고 머무름 시간이 적은 플루오라이드 이온은 제시된 이온 크로마토그래프 시스템과 스위칭 기술을 이용하여 분리 시스템에 주입되었다. 사전 농축(pre-concentration) 컬럼은 다량의 황산 이온을 보유할 수 있는 이온 교환 용량이 큰 분석용 컬럼(AS 9 HC)을 사용하였다. 분리용 컬럼은 플루오라이드 이온의 감도를 증가시키기 위하여 틈새 부피(void volumn)와 시스템 압력을 감소시킬 수 있도록 보호 컬럼(AG 14)을 사용하였다. 첫 번째 전기전도도 검출기로는 플루오라이드 이온의 회수율을, 두 번째 전기전도도 검출기로는 제거되는 황산 이온 피크를 관찰함으로써 결정된 최적의 10-포트주입기의 스위칭 시간은 4.3 분 이었다. 시료 주입량이 $25{\mu}L$ 일때, $500mg\;L^{-1}$ 의 높은 황산 이온이 포함된 용액에서 플루오라이드 이온의 검출한계(S/N = 3)는 $2.4{\mu}g/L$였다.

A Simple and Sensitive High Performance Liquid Chromatography-Electrospray Ionization/Mass Spectrometry Method for the Quantification of Ethyl Pyruvate in Rat Plasma

  • Kim, Hyun-Ji;Kim, Seung-Woo;Lee, Ja-Kyeong;Yoon, Sung-Hwa
    • Bulletin of the Korean Chemical Society
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    • 제32권4호
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    • pp.1221-1227
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    • 2011
  • Ethyl pyruvate (EP) is known as a scavenger of reactive oxygen species (ROS) in the body through its role in the donation of diketone groups to metals to form an EP-metal complex. In order to develop a method for the quantification of EP in biological media, a sensitive and specific, high-performance liquid chromatographyelectrospray ionization-mass spectrometry (HPLC-ESI/MS) method is used to determine the EP-alkali metal ion binding species. The analyte was separated on a ZORBOX SB-C8 ($3.5{\mu}m$, $30mm{\times}2.1mm$ I.D.) column and analyzed in selected ion monitoring (SIM) mode with a positive ESI interface using the m/z 255 $[2M + Na]^+$ ion. The method was validated over the concentration range of $0.5-60.0\;{\mu}g$/mL under 1/9 (v/v) of acetonitrile/methanol solvent system with flow rate 0.05 mL/min. The limit of quantification (LOQ) was $0.5{\mu}g$/mL.

어류 Metallothionein에 대한 특이적 면역 효소 측정법의 확립에 관한 연구 (The Study on the Establishment of Specific ELISA for the Detection of Fish Metallothionein)

  • 황갑수
    • Environmental Analysis Health and Toxicology
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    • 제11권1_2호
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    • pp.11-17
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    • 1996
  • The purpose of this experiment is to estabilish the sensitive and specific ELISA (enzyme linked immunosorbent assay) system for the detection of fish metallothionein (MT). Silver carp were injected with CA of 1-8mg/kg body wt. 4 times during 10 days. Silver carp was very tolerant species to CA. Cd induced MT in liver was seperated and purified by gel filtration chromatography and ion exchange chromatography and identified by spectrophotometry, native gel electrophoresis and western blot analysis. The rabbit antiserum was produced by immunizing rabbit with lyophilized MT, and the competitive ELISA system was estabilished for the detection of fish MT. In the present ELISA system, the detection limit was about 33 ng/ml. When this ELISA system was employed to determine the MT level in the supernatant sample of fish liver homogenate, the reaction curve showed a good parallel corelationship with the calibration curve over a certain dilution range. The results indicate that the competitive ELISA can be a useful tool for the detection of fish MT in the toxicological study and the evaluation of water pollution.

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Triglycine 수용액에 미치는 감마선의 영향 2. Electrophoresis 와 Paper Chromatogrphay 에 의한 연구 (The Effect of Gamma-Irradiation on Aqueous Solutions of Triglycine 2. Electrophoretic and Paper Chromatographic Study of Irradiated Triglycine)

  • ;강만식
    • 한국동물학회지
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    • 제7권1호
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    • pp.1-5
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    • 1964
  • Triglycin 수용액에 미치는 gamma 선의 영향을 low voltage electrophoresis, paper chromatography 및 carbonyl 화합물정량의 세 방법으로 연구하여 다음 결과를 얻었다. 1. 조사된 triglycine 분해산물중 한 성분이 동 ion 과 산화합물을 이루었으며 triglycine에 비하여 높은 음전성을 나타내었다. 2. 조사된 triglycine 분해산물중 다섯 성분이 paper chromatography 에 의해 분리되었으며 이중 둘이 동정되었다. 3. 조사된 triglycine 으로부터 생성되는 carbonly 화합물의 양은 $5{\times}10^{20}\;ev/ml$ 까지는 증가하였으며 이로부터 $1.9{\times}10^{21}\;ev/ml$ 까지의 고선량에서는 오히려 감소를 나타내어 complex system내에 있어서 이차반응에 관여함을 알 수 있었다. 4. 조사된 triglycine에서 glycine을 분리함으로써 peptide bond 의 가수분해의 가능성을 보여주었다.

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Purification and Characterization of Cop, a Protein Involved in the Copy Number Control of Plasmid pE194

  • Kwak, Jin-Hwan;Kim, Jung-Ho;Kim, Mu-Yong;Choi, Eung-Chil
    • Archives of Pharmacal Research
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    • 제21권3호
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    • pp.291-297
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    • 1998
  • Cop protein has been overexpressed in Escherichia coli using a T7 RNA polymerase system. Purification to apparent homogeneity was achieved by the sequential chromatography on ion exchange, affinity chromatography, and reverse phase high performance liquid chromatography system. The molecular weight of the purified Cop was estimated as 6.1 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). But the molecular mass of the native state Cop was shown to be 19 kDa by an analytical high performance size exclusion chromatography, suggesting a trimer-like structure in 50 mM Tris-HCI buffer (pH 7.5) containing 100 mM NaCl. Cop protein Was calculated to contain $39.1% {\alpha}-helix, 16.8% {\beta}-sheet$, 17.4% turn, and 26.8% random structure. The DNA binding property of Cop protein expressed in E. coli Was preserved during the expression and purification process. The isoelectric point of Cop was determined to be 9.0. The results of amino acid composition analysis and N-terminal amino acid sequencing of Cop showed that it has the same amino acid composition and N-terminal amino acid sequence as those deduced from its DNA sequence analysis, except for the partial removal of N-terminal methionine residue by methionyl-aminopeptidase in E. coli.

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銀Ion 및 역상(逆相) HPLC를 이용(利用)한 입체이성체적(立體異性體的) 분석(分析)에 의한 은행종실유(銀杏種實油)의 트리글리세리드의 분자종(分子種)에 관한 연구(硏究) (The Stereospecific Analysis of the Triacylglycerols of Ginkgo Nut Oils by High-Performace Liquid Chromatography(HPLC) in the Silver Ion and Reversed Phase Modes)

  • 조용계;우효경;김훈숙
    • 한국응용과학기술학회지
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    • 제14권1호
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    • pp.61-76
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    • 1997
  • Triacylglycerols of the seeds of Ginkgo biloba have been resolved by high-performace liquid chromatography(HPLC} in the silver-ion and reverse-phase modes. The fatty acids were identified by a combination of capillary gas chromatography and gas-chromatography /mass spectrometry as the methyl and /or picolinyl ester. The main components are $C_{18:2{\omega}6}$(39.0mol%), $C_{18:1{\omega}7}$(asclepic acid 21.5mol%), and $C_{18:1{\omega}9}$(oleic acid, 13.8mol%). Considerable amounts of unusual acid such as $C_{20:3{\Delta}^{5,11,14}$ (5.7mol%), $C_{18:2{\Delta}^{5,9}$(2.8mol%), and $C_{18:3}{\Delta}^{5,9,12}$(1.6mol%), were checked. In addition, an anteiso-branched fatty acid, 14-methylhexadecanoic acid, was also present as a minor component(0.9 mol%). The triacylglycerols were separated into 17 fractions by reverse-phase HPLC, and the fractionation was achieved according to the partition numnber(PN) in which a ${\Delta}^5$-non methylene interrupted double bond($^5$-NMDB) showed different behaviour from a methylene interrupted double bond in a molecule with a given cahinlength. Silver-ion HPLC exhibited excellent resolution in which fractions(23 fractions) were resolved on the basis of the number and configuration of double bonds. In this instance, the strength of interaction of a ${\Delta}^5$-NMDB system with silver ions seemed to be weaker than a methylene interrupted double bond system. The principal triacylglycerol species are as follows ; $(C_{18:2{\omega}6)2}/C_{18:1{\omega}7}$, $C_{18:1{\omega}9}/C_{18:1{\omega}7}/C_{18:2{\omega}6}$, $(C_{18:1{\omega}7)2}/C_{18:2{\omega}6}$, $C_{16:1{\omega}7}/C_{18:1{\omega}9}/C_{20:3}{\Delta}^{5,11,14}$, $C_{16:1{\omega}7}/C_{18:1{\omega}7}/C_{20:3}{\Delta}^{5,11,14}$, $C_{18:1{\omega}9}/C_{18:1{\omega}7}/C_{18:2{\omega}6}$, $C_{18:1{\omega}9}/C_{18:2}{\Delta}^{5,5}/C_{20:3}{\Delta}^{5,11,14}$, $(C_{18:1{\omega}7)2}/C_{18:2{\omega}6}$ and $(C_{18:1{\omega}9)2}/C_{18:2{\omega}6}$, while simple triacylglycerols without $C_{18:2{\omega}6})_3$ were not present. Stereospecific analysis showed that fatty acids with ${\Delta}^5$-NMDB system and saturated chains were predominantly located at the site of sn-3 carbon of glycerol backbones. It is evident that there is asymmetry in the distribution of fatty acids in the TG molecules of Ginkgo nut oils.