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Microcolumn abstracts 微柱凝集抽象
The journal of microcolumn separations : JMS Pub Date : 2001-10-16 DOI: 10.1002/mcs.1051
Douglas E. Raynie
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引用次数: 0
Monitoring of lipid degradation products by solid-phase microextraction* 固相微萃取法监测脂质降解产物*
The journal of microcolumn separations : JMS Pub Date : 2001-10-16 DOI: 10.1002/mcs.1045
Fruzsina Doleschall, Zsolt Kemény, Katalin Recseg, Katalin Kővári
{"title":"Monitoring of lipid degradation products by solid-phase microextraction*","authors":"Fruzsina Doleschall,&nbsp;Zsolt Kemény,&nbsp;Katalin Recseg,&nbsp;Katalin Kővári","doi":"10.1002/mcs.1045","DOIUrl":"10.1002/mcs.1045","url":null,"abstract":"<p>The final sensory characteristic of vegetable oils is influenced by a series of aroma compounds and volatile oxidation products formed during storage and processing. Crude sunflower oil was stored at room temperature and was regularly refined by applying physical refining process in laboratory scale studying lipid degradation. Effect of long-term storage and different steps of refining process on overall oxidative state and volatile compounds' formation was investigated by means of solid-phase microextraction (SPME). Results were achieved by a 100-μm polydimethylsiloxane fiber in the sample's headspace. Hexanal, tr-2-hexenal, tr-2-heptenal, tr-2-octenal, tr-2-nonenal, tr,tr-2,4-decadienal, α-pinene, pentylfuran, 1-octen-3-ol were used for external standard calibration. It was proved that hexanal and tr,tr-2,4-decadienal are aldehydes, which appear first in sunflower oil during long-term storage. Detection limit using splitless injection and flame ionization detector was in 1–5 mg/kg depending on individual components. SPME was successfully applied for both controlling decomposition of hydroperoxides during bleaching and aldehydes removal during deodorization. SPME and traditional static headspace techniques were compared. Static headspace gave better recovery and lower detection limit for compounds having higher volatility, but SPME made it possible to measure higher molecular weight aldehydes providing a simple, reliable solution. © 2001 John Wiley &amp; Sons, Inc. J Micro Sep 13: 215–220, 2001</p>","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 6","pages":"215-220"},"PeriodicalIF":0.0,"publicationDate":"2001-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51279873","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: 25
Evaluation of temperature programming for gradient elution in packed capillary liquid chromatography coupled to electrochemical detection 填充毛细管液相色谱-电化学耦合检测梯度洗脱温度规划的评价
The journal of microcolumn separations : JMS Pub Date : 2001-08-22 DOI: 10.1002/mcs.1039
O. Nordström, P. Molander, T. Greibrokk, R. Blomhoff, E. Lundanes
{"title":"Evaluation of temperature programming for gradient elution in packed capillary liquid chromatography coupled to electrochemical detection","authors":"O. Nordström,&nbsp;P. Molander,&nbsp;T. Greibrokk,&nbsp;R. Blomhoff,&nbsp;E. Lundanes","doi":"10.1002/mcs.1039","DOIUrl":"10.1002/mcs.1039","url":null,"abstract":"<p>A miniaturized amperometric detector compatible with temperature-programmed packed capillary liquid chromatography has been constructed and evaluated. Temperature programming could successfully be used as a tool for retention control, providing gradient action that did not influence the detector performance. A 7-μm single carbon fiber was utilized as working electrode and detection was performed in a 50-μm i.d. fused silica detection capillary which also functioned as restriction capillary. Separation of tyrosine, 3-(3,4-dihydroxyphenyl)alanine, 3-chloro-tyrosine and 3-NO<sub>2</sub>-tyrosine was achieved in 6 min using a temperature program from 30°C to 100°C with a ramp of 8°C/min on a 25 cm 0.32 mm i.d. column packed with 3 μm Hypersil ODS. The mobile phase consisted of 50 mM citric acid (pH 3.10)-methanol (95+ 5, v/v), and the mass limit of detection was in the range 1–5 pg using 1.2 V vs the Ag/AgCl reference electrode. © 2001 John Wiley &amp; Sons, Inc. J Micro Sep 13: 179–185, 2001</p>","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 5","pages":"179-185"},"PeriodicalIF":0.0,"publicationDate":"2001-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51279103","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: 10
Microcolumn abstracts 微柱凝集抽象
The journal of microcolumn separations : JMS Pub Date : 2001-08-22 DOI: 10.1002/mcs.1044
Douglas E. Raynie
{"title":"Microcolumn abstracts","authors":"Douglas E. Raynie","doi":"10.1002/mcs.1044","DOIUrl":"https://doi.org/10.1002/mcs.1044","url":null,"abstract":"","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 5","pages":"211-212"},"PeriodicalIF":0.0,"publicationDate":"2001-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137959176","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
On-line coupled supercritical fluid extraction–liquid chromatography–gas chromatography–mass spectrometry for the analysis of organic acids 在线耦合超临界流体萃取-液相色谱-气相色谱-质谱法分析有机酸
The journal of microcolumn separations : JMS Pub Date : 2001-08-22 DOI: 10.1002/mcs.1043
Masahiko Shimmo, Tuulia Hyötyläinen, Kari Hartonen, Marja-Liisa Riekkola
{"title":"On-line coupled supercritical fluid extraction–liquid chromatography–gas chromatography–mass spectrometry for the analysis of organic acids","authors":"Masahiko Shimmo,&nbsp;Tuulia Hyötyläinen,&nbsp;Kari Hartonen,&nbsp;Marja-Liisa Riekkola","doi":"10.1002/mcs.1043","DOIUrl":"10.1002/mcs.1043","url":null,"abstract":"<p>An on-line coupled supercritical fluid extraction–liquid chromatography–gas chromatography–mass spectrometry (SFE-LC-GC-MS) system was constructed and applied for the quantitative analysis of selected organic acids. In SFE the analytes were derivatized <i>in situ</i> with pentafluorobenzyl bromide in the presence of the modifiers triethylamine and acetone to make them less polar, more volatile, and soluble in supercritical CO<sub>2</sub>. Parameters that affect derivatization and extraction were studied. Excess reagent was efficiently removed by LC prior to GC analysis. Pentane containing 3% ethyl acetate was suitable for elution of both the SFE solid phase trap and LC-GC. A LC fraction of 1600 μL could be transferred using an on-column interface and partially concurrent solvent evaporation. The whole analysis took place for 2 h in a closed system. The method was linear in the range 5–200 ng, with detection limits around 3 ng. The relative standard deviations of the method were 5–20%. The on-line SFE-LC-GC-MS system was applied for the analysis of aerosol samples collected with Teflon filters in Helsinki, Finland. Benzoic acid and butyric acid were identified at the level of nanograms per cubic meter, but pinonic acid was not observed. The importance of anthropogenic emissions for aerosol formation in the region is implied. © 2001 John Wiley &amp; Sons, Inc. J Micro Sep 13: 202–210, 2001</p>","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 5","pages":"202-210"},"PeriodicalIF":0.0,"publicationDate":"2001-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51279839","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: 19
Separation of pyridazinone derivatives using pressurized gradient capillary electrochromatography 加压梯度毛细管电色谱法分离吡嗪酮衍生物
The journal of microcolumn separations : JMS Pub Date : 2001-08-22 DOI: 10.1002/mcs.1041
Zhengjin Jiang, Ruyu Gao, Yibo Zhou, Zhichao Zhang, Qinsun Wang, Chao Yan
{"title":"Separation of pyridazinone derivatives using pressurized gradient capillary electrochromatography","authors":"Zhengjin Jiang,&nbsp;Ruyu Gao,&nbsp;Yibo Zhou,&nbsp;Zhichao Zhang,&nbsp;Qinsun Wang,&nbsp;Chao Yan","doi":"10.1002/mcs.1041","DOIUrl":"10.1002/mcs.1041","url":null,"abstract":"<p>A pressurized, gradient capillary electrochromatography (pCEC) instrument has been designed and built. This versatile instrument can be operated in three separation modes, namely, pCEC, micro high performance liquid chromatography (μHPLC) and capillary electrophoresis (CE). In pCEC mode, both an electric field and a pressure can be applied across a packed capillary column, allowing fine tuning of the selectivity without changing the composition of the mobile phase. This technique also facilitates the use of gradient elution, making it more powerful for separation of complex mixtures. The technique was evaluated and compared with μHPLC by separating a mixture of organic acids and neutral pyridazinone derivatives. Experiments in pCEC were carried out with a fused-silica capillary column packed with 3-μm octadecyl silica (ODS) particles. A separation with baseline resolution was achieved for ten pyridazinone derivatives at optimum conditions. Compared with the separation results by μHPLC method, pCEC is more powerful than μHPLC for the separation of both neutral and charged compounds. The influence of the supplementary pressure, the flow rate of pumps and applied voltage on the separation was also investigated. © 2001 John Wiley &amp; Sons, Inc. J Micro Sep 13: 191–196, 2001</p>","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 5","pages":"191-196"},"PeriodicalIF":0.0,"publicationDate":"2001-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51279341","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: 22
Identification of CS-derived compounds formed during heat-dispersion of CS riot control agent*† CS防暴剂热分散过程中CS衍生化合物的鉴定*†
The journal of microcolumn separations : JMS Pub Date : 2001-08-22 DOI: 10.1002/mcs.1040
Timothy A. Kluchinsky Jr., Paul B. Savage, Michael V. Sheely, Richard J. Thomas, Philip A. Smith
{"title":"Identification of CS-derived compounds formed during heat-dispersion of CS riot control agent*†","authors":"Timothy A. Kluchinsky Jr.,&nbsp;Paul B. Savage,&nbsp;Michael V. Sheely,&nbsp;Richard J. Thomas,&nbsp;Philip A. Smith","doi":"10.1002/mcs.1040","DOIUrl":"10.1002/mcs.1040","url":null,"abstract":"<p>High temperatures are frequently used to disperse 2-chlorobenzylidene malononitrile (CS) riot control agent. We examined airborne CS degradation products heat-dispersed together with CS from canisters of a type used by law enforcement personnel for crowd and riot control. Air contaminants derived from CS were trapped using a polytetraflouroethylene filter. Analysis was by open tubular gas chromatography coupled to mass spectrometry. Compounds observed in addition to CS included 2-chlorobenzaldehyde, 2-chlorobenzonitrile, quinoline, 2-chlorobenzylcyanide, 1,2-dicyanobenzene, 3-(2-chlorophenyl)propynenitrile, <i>cis</i> and <i>trans</i> isomers of 2-chlorocinnamonitrile, 2,2-dicyano-3-(2-chlorophenyl)oxirane, 2-chlorodihydrocinnamonitrile, benzylidenemalononitrile, <i>cis</i> and <i>trans</i> isomers of 2-cyanocinnamonitrile, 2-chlorobenzylmalononitrile, 3-quinoline carbonitrile, and 3-isoquinoline carbonitrile. © 2001 John Wiley &amp; Sons, Inc. J Micro Sep 13: 186–190, 2001</p>","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 5","pages":"186-190"},"PeriodicalIF":0.0,"publicationDate":"2001-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51279178","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: 15
Determination of the free concentration of ropivacaine in plasma by packed capillary liquid chromatography: A comparison of ultrafiltration and microdialysis as sample preparation methods 填充毛细管液相色谱法测定血浆中罗哌卡因游离浓度:超滤和微透析两种制样方法的比较
The journal of microcolumn separations : JMS Pub Date : 2001-08-22 DOI: 10.1002/mcs.1042
Pernilla Koivisto, Sara K. Bergström, Karin E. Markides
{"title":"Determination of the free concentration of ropivacaine in plasma by packed capillary liquid chromatography: A comparison of ultrafiltration and microdialysis as sample preparation methods","authors":"Pernilla Koivisto,&nbsp;Sara K. Bergström,&nbsp;Karin E. Markides","doi":"10.1002/mcs.1042","DOIUrl":"10.1002/mcs.1042","url":null,"abstract":"<p>In this study, ultrafiltration and microdialysis have been compared as sample preparation methods to separate the free fraction of ropivacaine from the protein bound in 150 μL plasma. A liquid chromatographic system with packed capillary columns (0.2 mm internal diameter) was used to enhance sensitivity when analyzing the small sample volumes obtained after the ultrafiltration and the microdialysis. The microdialysis was performed with probes of our own construction, and to save analysis time, the microdialysis sampling was coupled on-line to the liquid chromatographic system. The reduction of back pressure in the microdialysis outlet tube and in the injector was found to be essential. The free fraction obtained with each method was equivalent: both gave a free fraction of 6%. © 2001 John Wiley &amp; Sons, Inc. J Micro Sep 13: 197–201, 2001</p>","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 5","pages":"197-201"},"PeriodicalIF":0.0,"publicationDate":"2001-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51279511","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: 11
New editorial board members 编委会新成员
The journal of microcolumn separations : JMS Pub Date : 2001-07-02 DOI: 10.1002/mcs.1033
{"title":"New editorial board members","authors":"","doi":"10.1002/mcs.1033","DOIUrl":"https://doi.org/10.1002/mcs.1033","url":null,"abstract":"","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 4","pages":"145-148"},"PeriodicalIF":0.0,"publicationDate":"2001-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137636217","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
Enantioselective packed column SFC for the separation of 2-oxatetracyclo [5.4.0.01,8.05,11] undec-9-ene derivatives 2-草四环[5.4.0.01,8.05,11]十一-9-烯衍生物的对映选择性填充柱SFC
The journal of microcolumn separations : JMS Pub Date : 2001-07-02 DOI: 10.1002/mcs.1036
Koen Desmet, Pat Sandra, Kristóf Vízvárdi, Georges J. Hoornaert, Erik Van der Eycken
{"title":"Enantioselective packed column SFC for the separation of 2-oxatetracyclo [5.4.0.01,8.05,11] undec-9-ene derivatives","authors":"Koen Desmet,&nbsp;Pat Sandra,&nbsp;Kristóf Vízvárdi,&nbsp;Georges J. Hoornaert,&nbsp;Erik Van der Eycken","doi":"10.1002/mcs.1036","DOIUrl":"10.1002/mcs.1036","url":null,"abstract":"<p>Packed column SFC (pSFC) on a 3,5-dimethylphenylcarbamate derivative of amylose (Chiralpak AD) has exhibited high enantioselectivity for the separation of 2-oxatetracyclo [5.4.0.0<sup>1,8</sup>.0<sup>5,11</sup>] undec-9-ene derivatives resulting from the UV-radiation of substituted 4-phenoxybut-1-enes. The speed of analysis compared to normal phase LC and mild conditions compared to capillary GC were valuable characteristics of pSFC for the analysis of these labile products. © 2001 John Wiley &amp; Sons, Inc. J Micro Sep 13: 163–168, 2001</p>","PeriodicalId":83120,"journal":{"name":"The journal of microcolumn separations : JMS","volume":"13 4","pages":"163-168"},"PeriodicalIF":0.0,"publicationDate":"2001-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mcs.1036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51278677","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: 2
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