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Träfflista för sökning "WFRF:(Markides KE) "

Sökning: WFRF:(Markides KE)

  • Resultat 1-46 av 46
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2.
  • Barnidge, DR, et al. (författare)
  • A design for low-flow sheathless electrospray emitters
  • 1999
  • Ingår i: ANALYTICAL CHEMISTRY. - : AMER CHEMICAL SOC. - 0003-2700. ; 71:19, s. 4115-4118
  • Tidskriftsartikel (refereegranskat)abstract
    • An extremely simple design has been developed for producing durable sheathless electrospray emitters that give highly stable electrospray for unlimited lifetimes. The emitters can be fashioned from any style fused-silica capillary and are ideally suited
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  • Bylund, D, et al. (författare)
  • Peak purity assessment in liquid chromatography-mass spectrometry
  • 2001
  • Ingår i: JOURNAL OF CHROMATOGRAPHY A. - : ELSEVIER SCIENCE BV. - 0021-9673. ; 915:1-2, s. 43-52
  • Tidskriftsartikel (refereegranskat)abstract
    • Fixed-size moving window evolving factor analysis and base peak chromatograms have been used for peak purity detection in data generated with LC-MS. The two methods were evaluated with both real and simulated data and were found to be fast and complementa
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  • Fridstrom, A, et al. (författare)
  • Dextran-modified polypropylene hollow fibers for use in capillary electrophoresis
  • 1997
  • Ingår i: JOURNAL OF MICROCOLUMN SEPARATIONS. - : JOHN WILEY & SONS INC. - 1040-7685. ; 9:1, s. 1-7
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Polypropylene hollow fibers with adsorbed phenyldextran as surface modification were shown to give useful and stable columns in capillary electrophoresis (CE). Two different sizes of phenyldextran, 40 and 500 KDa, and allyldextran, 150 and 2000 KDa, were
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9.
  • FRIDSTROM, A, et al. (författare)
  • MICELLAR ELECTROKINETIC CAPILLARY CHROMATOGRAPHY USING POLYMERIC HOLLOW FIBERS
  • 1995
  • Ingår i: CHROMATOGRAPHIA. - : FRIEDR VIEWEG SOHN VERLAG GMBH. - 0009-5893. ; 41:5-6, s. 295-300
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • In this paper, polymeric hollow fibers prepared from pH-stable polypropylene were used as columns for micellar electrokinetic capillary chromatography (MECC). The electroosmotic flow (EOF) for polypropylene hollow fibers was evaluated in the pH range of 5
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  • Jacobson, GB, et al. (författare)
  • Supercritical fluid extraction of C-11-labeled metabolites in tissue using supercritical ammonia
  • 1997
  • Ingår i: ANALYTICAL CHEMISTRY. - : AMER CHEMICAL SOC. - 0003-2700. ; 69:3, s. 275-280
  • Tidskriftsartikel (refereegranskat)abstract
    • Supercritical fluid extraction (SFE) of C-11-labeled tracer compounds and their metabolites from biological tissue was performed using supercritical ammonia in an attempt to develop a rapid extraction procedure that allowed subsequent analysis of the lab
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  • Jacobson, GB, et al. (författare)
  • Synthesis of C-11-labeled guanidines in supercritical ammonia
  • 1996
  • Ingår i: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - : AMER CHEMICAL SOC. - 0002-7863. ; 118:29, s. 6868-6872
  • Tidskriftsartikel (refereegranskat)abstract
    • The synthesis of ten C-11-labeled aromatic and aliphatic guanidines in supercritical ammonia is described. The corresponding amines were first converted into cyanamides by reactions with [C-11]cyanogen bromide. The aliphatic amines gave high yields of C-
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17.
  • Juvancz, Z, et al. (författare)
  • A polymeric high resolution Pirkle-type chiral stationary phase for GC and SFC
  • 1998
  • Ingår i: Enantomier. - 1024-2430. ; 3:2, s. 89-94
  • Tidskriftsartikel (refereegranskat)abstract
    • A chiral stationary phase with a silicone backbone and substituted side chains of (S)-N-1-(1-naphthyl)-4-propyloxybenzamide substitution has been introduced for open tubular column GC and SFC. The stationary phase has a broad temperature working range 20-280 degrees C), and provides highly efficient columns (> 3000 plates/meter). One of the key interactions for selectivity is the pi-pi interaction, but the stationary phase can also be used to separate enantiomers without pi electrons. The phase can be used to separate a broad range of compounds, which is demonstrated by the separation of enantiomeric compounds having aromatic rings, amino acid and terpenic alcohol groups. This stationary phase expands the use of Pirkle phases into the field of open tubular column chromatography.
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  • Juvancz, Z, et al. (författare)
  • Chiral analysis of metoprolol and its by-products by capillary electrophoresis
  • 1999
  • Ingår i: JOURNAL OF MICROCOLUMN SEPARATIONS. - : JOHN WILEY & SONS INC. - 1040-7685. ; 11:10, s. 716-722
  • Tidskriftsartikel (refereegranskat)abstract
    • The enantiomers of metoprolol, a frequently used beta-blocker, have different physiological effects, which makes their chiral separation necessary. The separation of the main product from its by-products and their chiral separation were also aims of this
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  • Juvancz, Z, et al. (författare)
  • Enantiomer separation of disopyramide with capillary electrophoresis using various cyclodextrins
  • 1997
  • Ingår i: ELECTROPHORESIS. - : VCH PUBLISHERS INC. - 0173-0835. ; 18:6, s. 1002-1006
  • Tidskriftsartikel (refereegranskat)abstract
    • Enantiomers of disopyramide display different biological actions, and therefore chiral selective analysis is necessary. Fifteen different cyclodextrins (CDs) and CD derivatives were tested as capillary electrophoresis (CE) additives for the chiral separa
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21.
  • Juvancz, Z, et al. (författare)
  • Phosphated cyclodextrins as new acidic chiral additives for capillary electrophoresis
  • 1997
  • Ingår i: JOURNAL OF MICROCOLUMN SEPARATIONS. - : JOHN WILEY & SONS INC. - 1040-7685. ; 9:8, s. 581-589
  • Tidskriftsartikel (refereegranskat)abstract
    • The study describes the use of alpha,beta, and gamma phosphated cyclodextrins (CDs) for chiral separation by capillary electrophoresis (CE). A systematic study was performed to establish the effect of such variables as the type and concentration of chira
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22.
  • Koivisto, P, et al. (författare)
  • Factors affecting the preparation of packed capillary columns in supercritical carbon dioxide media
  • 1997
  • Ingår i: JOURNAL OF MICROCOLUMN SEPARATIONS. - : JOHN WILEY & SONS INC. - 1040-7685. ; 9:2, s. 97-103
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, packed capillary columns were prepared using supercritical carbon dioxide as a packing carrier. A factorial design was used to examine the effect that four selected factors have on the packing performance. The investigated factors were: 1)
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  • Nilsson, S, et al. (författare)
  • On-column conductive coating for thermolabile columns used in CZE-sheathless electrospray ESI-MS
  • 2000
  • Ingår i: RAPID COMMUNICATIONS IN MASS SPECTROMETRY. - : JOHN WILEY & SONS LTD. - 0951-4198. ; 14:1, s. 6-11
  • Tidskriftsartikel (refereegranskat)abstract
    • A simple and very mild approach for the application of a conductive layer for sheathless electrospray has been developed. A modified 'fairy dust' method is employed in which 2 mu m gold particles are applied by a thin layer of silicone on shaped tips. Thi
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  • Selditz, U, et al. (författare)
  • ESI/TOF-MS detection for microseparation techniques
  • 1999
  • Ingår i: CHIMIA. - : NEW SWISS CHEMICAL SOC. - 0009-4293 .- 2673-2424. ; 53:10, s. 506-510
  • Tidskriftsartikel (refereegranskat)abstract
    • The choice of electrospray ionisation/time-of-flight mass spectrometry (ESI/TOF-MS) as mass analyser for combination with microseparation techniques, such as mu LC, CE and CEC, may be recommended due to the features that present-day TOF-MS instruments ha
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  • Sjoberg, PJR, et al. (författare)
  • A method for determination of ion distribution within electrosprayed droplets
  • 2001
  • Ingår i: ANALYTICAL CHEMISTRY. - : AMER CHEMICAL SOC. - 0003-2700. ; 73:1, s. 23-28
  • Tidskriftsartikel (refereegranskat)abstract
    • A simplified method for determination of ion distribution within electrospray ionization droplets has been developed, The method is based on an electrospray ionization mass spectrometry equilibrium partitioning model recently developed by Enke (Enke, C. G
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  • Stefansson, M, et al. (författare)
  • Regulation of multimer formation in electrospray mass spectrometry
  • 1996
  • Ingår i: ANALYTICAL CHEMISTRY. - : AMER CHEMICAL SOC. - 0003-2700. ; 68:10, s. 1792-1797
  • Tidskriftsartikel (refereegranskat)abstract
    • Extensive multimer formation of small and uncharged analytes was observed in electrospray mass spectrometry. The concentration-dependent aggregation behavior, including species up to tetramers, resulted in highly nonlinear calibration curves, For some an
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  • Wallenborg, SR, et al. (författare)
  • A microelectrochemical detector for use at low linear velocities in capillary column systems
  • 1997
  • Ingår i: ANALYTICA CHIMICA ACTA. - : ELSEVIER SCIENCE BV. - 0003-2670. ; 344:1-2, s. 77-85
  • Tidskriftsartikel (refereegranskat)abstract
    • An end-column microelectrochemical detector, based on a 25 mu m platinum electrode, was used in miniaturised flow and separation systems, at linear mobile phase velocities below 0.1 cm s(-1) (i.e. a volumetric flow of a few mu l min(-1) for a 200 mu m i
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  • YUN, H, et al. (författare)
  • CHARCOAL POROUS LAYER OPEN-TUBULAR COLUMN GAS-CHROMATOGRAPHY FOR PERMANENT GAS-ANALYSIS
  • 1995
  • Ingår i: JOURNAL OF MICROCOLUMN SEPARATIONS. - : MICROSEPARATIONS INC. - 1040-7685. ; 7:3, s. 207-212
  • Tidskriftsartikel (refereegranskat)abstract
    • The preparation of charcoal porous layer open tabular (PLOT) columns, and their application to the separation of permanent gases and light hydrocarbons are reported. Two types of charcoal, coconut and darco charcoal, were used to prepare columns from fus
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  • Resultat 1-46 av 46

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