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Journal of chromatography最新文献

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Cumulative author, subject, compound and special issue indexes. Volumes 601-650 (1992-1993). 累积的作者、主题、复合和专刊索引。第601-650卷(1992-1993)。
Journal of chromatography Pub Date : 1994-05-20
{"title":"Cumulative author, subject, compound and special issue indexes. Volumes 601-650 (1992-1993).","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"651 1-2","pages":"1-401"},"PeriodicalIF":0.0,"publicationDate":"1994-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18956284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Processing of envelope polypeptides of herpes simplex virus type 1. Demonstration of variation in different cell lines by high-performance liquid chromatography and radioimmunoprecipitation. 1型单纯疱疹病毒包膜多肽的处理。用高效液相色谱法和放射免疫沉淀法证明不同细胞系的差异。
Journal of chromatography Pub Date : 1994-02-11
G Kessie, D M Dela Cruz, M A Taha, F J al-Shammary, A F Tawfik, M N al-Ahdal
{"title":"Processing of envelope polypeptides of herpes simplex virus type 1. Demonstration of variation in different cell lines by high-performance liquid chromatography and radioimmunoprecipitation.","authors":"G Kessie,&nbsp;D M Dela Cruz,&nbsp;M A Taha,&nbsp;F J al-Shammary,&nbsp;A F Tawfik,&nbsp;M N al-Ahdal","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>[35S]Methionine-labelled envelope polypeptides of herpes simplex virus type 1, strain F, propagated in mammalian cell culture of various origins, were separated by ion-exchange high-performance liquid chromatography on a TSK DEAE-3SW column. Analysis of the fractions by radioimmunoprecipitation followed by sodium dodecyl sulphate polyacrylamide gel electrophoresis of the immunoprecipitates showed similarities as well as distinct differences in the number, migration patterns and molecular mass of the synthesized polypeptides, depending on the host cell. The results show that this method can be used to demonstrate species-specific or organ-specific differences in the processing of virus-specified polypeptides synthesized in host cells.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"652 2","pages":"234-9"},"PeriodicalIF":0.0,"publicationDate":"1994-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19000969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assay of urinary 2,3-dinor-6-oxo prostaglandin F1 alpha by gas chromatography-tandem mass spectrometry. 气相色谱-串联质谱法测定尿2,3-二-6-氧前列腺素F1 α。
Journal of chromatography Pub Date : 1993-12-22
A Ferretti, V P Flanagan
{"title":"Assay of urinary 2,3-dinor-6-oxo prostaglandin F1 alpha by gas chromatography-tandem mass spectrometry.","authors":"A Ferretti,&nbsp;V P Flanagan","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Prostacyclin (PGI2), an important determinant of cardiovascular biology, is produced from arachidonic acid by endothelial cells. Measurement of its stable urinary metabolite, 2,3-dinor-6-oxo prostaglandin F1 alpha (PGI2-M), is the approach of choice to assess variations of the endogenous synthesis of PGI2 that occur in response to dietary, pharmacological and pathological alterations. We developed a relatively simple stable isotope dilution assay for PGI2-M which involves solid-phase extraction of 10 ml of urine with Chem Elut disposable columns, water/solvent partitioning from basic and acidic environments with ethyl acetate and methylene chloride, derivatization to 1-pentafluorobenzyl ester followed by TLC, methoximation and trimethylsilylation. Quantification was achieved, for the first time for PGI2-M, by capillary GC-electron capture negative ion MS-MS with a triple quadrupole mass spectrometer operated in the negative ion detection mode with methane as moderating gas. The mean inter-assay R.S.D., determined on 12 different urine samples, was 5.1 (range 0.4% to 10.5%). The excretion of PGI2-M in 34 healthy male subjects (age 26 to 57) was 156.2 +/- 65.2 (mean +/- S.D.) ng/24 h.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"622 2","pages":"109-15"},"PeriodicalIF":0.0,"publicationDate":"1993-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19141627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simultaneous analysis of homovanillic acid, 5-hydroxyindoleacetic acid, 3-methoxy-4-hydroxyphenylethylene glycol and vanilmandelic acid in plasma from alcoholics by high-performance liquid chromatography with electrochemical detection. Critical comparison of solid-phase and liquid-liquid extraction methods. 高效液相色谱-电化学检测法同时分析酒精类饮料血浆中香草酸、5-羟基吲哚乙酸、3-甲氧基-4-羟基苯基乙二醇和香草酸。固相萃取法与液-液萃取法的关键性比较。
Journal of chromatography Pub Date : 1993-12-22
J Hartleb, S Eue, A Kemper
{"title":"Simultaneous analysis of homovanillic acid, 5-hydroxyindoleacetic acid, 3-methoxy-4-hydroxyphenylethylene glycol and vanilmandelic acid in plasma from alcoholics by high-performance liquid chromatography with electrochemical detection. Critical comparison of solid-phase and liquid-liquid extraction methods.","authors":"J Hartleb,&nbsp;S Eue,&nbsp;A Kemper","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A method is described for the simultaneous determination of vanilmandelic acid, 3-methoxy-4-hydroxyphenylethylene glycol, 5-hydroxyindoleacetic acid, and homovanillic acid in a human plasma sample using reversed-phase high-performance liquid chromatography with column switching and amperometric detection. Two methods of sample preparation were tested. Liquid-liquid extraction yields better recoveries, is more selective and precise than solid-phase extraction and allows a shorter time of chromatographic analysis. Estimated plasma values of the metabolites from healthy controls are in good agreement with previously reported levels. Studies of alcoholics at the beginning of the delirium tremens provided different plasma levels of the metabolites, dependent on the different duration--and hence the severity--of the delirium.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"622 2","pages":"161-71"},"PeriodicalIF":0.0,"publicationDate":"1993-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18521982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determination of the aza alkyl lysophospholipid 3-methoxy-2-N,N-methyloctadecylaminopropyloxyphosphorylcholine in rat plasma by liquid chromatography-particle beam-mass spectrometry. 液相色谱-粒子束质谱法测定大鼠血浆中偶氮烷基溶血磷脂3-甲氧基-2- n, n -甲基locloctadecylaminopropyloxyphospphospylcholine。
Journal of chromatography Pub Date : 1993-12-22
C Celma
{"title":"Determination of the aza alkyl lysophospholipid 3-methoxy-2-N,N-methyloctadecylaminopropyloxyphosphorylcholine in rat plasma by liquid chromatography-particle beam-mass spectrometry.","authors":"C Celma","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A sensitive and specific method for the determination of the aza alkyl lysophospholipid (AALP) 3-methoxy-2-N,N-methyloctadecylaminopropyloxyphosphorylcholine (I) in rat plasma is described. The target molecule was analyzed by high-performance liquid chromatography (HPLC)-mass spectrometry (MS) after one single liquid-liquid extraction with chloroform-methanol (2:1, v/v). 1,2-Didecanoyl-sn-glycero-3-phosphocholine was used as internal standard. HPLC was carried out using a polymeric reversed-phase column; the coupling to the mass spectrometer was a particle beam (PB) interface, and the ionization method was electron impact (EI). This simple and rugged method permits the measurement of I in rat plasma in the range of 25 ng/ml-5 micrograms/ml with good accuracy and precision and is used in pharmacokinetic studies.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"622 2","pages":"215-22"},"PeriodicalIF":0.0,"publicationDate":"1993-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19142264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phase transitions of reversed-phase stationary phases. Cause and effects in the mechanism of retention. 反相固定相的相变。滞留机制中的因果关系。
Journal of chromatography Pub Date : 1993-12-17 DOI: 10.1016/0021-9673(93)80807-k
J F Wheeler, T L Beck, S J Klatte, L A Cole, J G Dorsey
{"title":"Phase transitions of reversed-phase stationary phases. Cause and effects in the mechanism of retention.","authors":"J F Wheeler,&nbsp;T L Beck,&nbsp;S J Klatte,&nbsp;L A Cole,&nbsp;J G Dorsey","doi":"10.1016/0021-9673(93)80807-k","DOIUrl":"https://doi.org/10.1016/0021-9673(93)80807-k","url":null,"abstract":"<p><p>We provide a somewhat historical perspective on the work that has been accomplished that supports the suggestion of phase transitions in reversed-phase liquid chromatographic bonded phases. In addition to this general review, we consider from both a practical and theoretical viewpoint the implications of such transitions in the rational design of improved reversed-phase separations. Analytical theory and molecular simulation approaches to chromatographic stationary phases and related systems are reviewed. Initial results are presented on the temperature, density and chain length dependences of stationary phase properties. The role of computer simulation in analyzing transition behavior and retention processes is discussed.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"656 1-2","pages":"317-33"},"PeriodicalIF":0.0,"publicationDate":"1993-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0021-9673(93)80807-k","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19105803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 35
Electrical double-layer models of ion-modified (ion-pair) reversed-phase liquid chromatography. 离子修饰(离子对)反相液相色谱的电双层模型。
Journal of chromatography Pub Date : 1993-12-17 DOI: 10.1016/0021-9673(93)80819-t
J G Chen, S G Weber, L L Glavina, F F Cantwell
{"title":"Electrical double-layer models of ion-modified (ion-pair) reversed-phase liquid chromatography.","authors":"J G Chen,&nbsp;S G Weber,&nbsp;L L Glavina,&nbsp;F F Cantwell","doi":"10.1016/0021-9673(93)80819-t","DOIUrl":"https://doi.org/10.1016/0021-9673(93)80819-t","url":null,"abstract":"<p><p>Stoichiometric models of ion-modified reversed-phase liquid chromatography are based on chemical equilibria between ionic modifiers and analyte. These are briefly discussed. Non-stoichiometric models portray the ionic solute as being under the summed influence of all of the ions in the system. Chromatographic theories have been developed that are based on the Poisson-Boltzmann equation, which quantitates the summed influence of the ions in the system on the solute. These ideas and quantitative predictions are described and are critically discussed.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"656 1-2","pages":"549-76"},"PeriodicalIF":0.0,"publicationDate":"1993-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0021-9673(93)80819-t","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19105805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 56
Hydrophobicity estimations by reversed-phase liquid chromatography. Implications for biological partitioning processes. 用反相液相色谱法估计疏水性。对生物分区过程的启示。
Journal of chromatography Pub Date : 1993-12-17 DOI: 10.1016/0021-9673(93)80815-p
J G Dorsey, M G Khaledi
{"title":"Hydrophobicity estimations by reversed-phase liquid chromatography. Implications for biological partitioning processes.","authors":"J G Dorsey,&nbsp;M G Khaledi","doi":"10.1016/0021-9673(93)80815-p","DOIUrl":"https://doi.org/10.1016/0021-9673(93)80815-p","url":null,"abstract":"<p><p>Liquid chromatography has long been used for the estimation of \"hydrophobicity\" of solutes of biological, environmental and agricultural interest. These measurements have taken the form of octanol-water partition coefficient estimation, or less often the more fundamental processes that the octanol-water partition coefficient is intended to model. Here we review both the chromatographic methods used for these estimations, their successes and failures, and discuss pertinent solution thermodynamics of the partitioning of small molecules between bulk phases, such as octanol and water, and between a bulk phase and an interphase, such as partitioning of solute molecules into lipid layers and biological membranes.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"656 1-2","pages":"485-99"},"PeriodicalIF":0.0,"publicationDate":"1993-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0021-9673(93)80815-p","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19105804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 180
Direct determination of ephedrine and norephedrine in human urine by capillary zone electrophoresis. 毛细管区带电泳法直接测定人尿中的麻黄碱和去甲麻黄碱。
Journal of chromatography Pub Date : 1993-12-08
M Chicharro, A Zapardiel, E Bermejo, J A Perez, L Hernández
{"title":"Direct determination of ephedrine and norephedrine in human urine by capillary zone electrophoresis.","authors":"M Chicharro,&nbsp;A Zapardiel,&nbsp;E Bermejo,&nbsp;J A Perez,&nbsp;L Hernández","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>This paper describes a simple and fast method for the simultaneous determination of ephedrine and norephedrine in urine by capillary zone electrophoresis. Separation and determination of these stimulants in human urine was performed in 50 mM phosphate buffer at pH 9.5, modifying the electroosmotic flow with acetonitrile. The method allows direct determination of the stimulants in urine in concentrations lower than 20.0 micrograms/ml, and has a limit of determination of 2.6 +/- 0.2 micrograms/ml for ephedrine and 2.3 +/- 0.2 micrograms/ml for norephedrine in urine and may be applied for doping control.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"622 1","pages":"103-8"},"PeriodicalIF":0.0,"publicationDate":"1993-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19112349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Supercritical fluid extraction of fluvalinate residues in honey. Determination by high-performance liquid chromatography. 蜂蜜中氟戊酸残留量的超临界萃取。高效液相色谱法测定。
Journal of chromatography Pub Date : 1993-11-26 DOI: 10.1016/0021-9673(93)87016-f
J Atienza, J J Jiménez, J L Bernal, M T Martín
{"title":"Supercritical fluid extraction of fluvalinate residues in honey. Determination by high-performance liquid chromatography.","authors":"J Atienza,&nbsp;J J Jiménez,&nbsp;J L Bernal,&nbsp;M T Martín","doi":"10.1016/0021-9673(93)87016-f","DOIUrl":"https://doi.org/10.1016/0021-9673(93)87016-f","url":null,"abstract":"<p><p>A method for the analysis of fluvalinate residues in honey from beehives treated with this product to prevent varroatosis is described. The method involves supercritical fluid extraction with carbon dioxide and further analysis by high-performance liquid chromatography on a C18 reversed-phase column, acetonitrile-water (80:20) as mobile phase and detection at 254 nm. This method is simpler than the one in which extraction with organic solvents, thin-layer chromatography and gas chromatography is used.</p>","PeriodicalId":15508,"journal":{"name":"Journal of chromatography","volume":"655 1","pages":"95-9"},"PeriodicalIF":0.0,"publicationDate":"1993-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0021-9673(93)87016-f","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19294590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 28
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