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  • Column liquid chromatography  (85)
  • Springer  (85)
  • American Chemical Society
  • Elsevier
  • International Union of Crystallography
  • Wiley-Blackwell
  • 2000-2004
  • 1985-1989  (85)
Collection
Keywords
Publisher
  • Springer  (85)
  • American Chemical Society
  • Elsevier
  • International Union of Crystallography
  • Wiley-Blackwell
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Bioanalysis of fluorouracil applying liquid chromatography and valve switching (1988)
    Springer
    Chromatographia 25 (1988), S. 806-810 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion-pair chromatography ; Valve switching ; Fluorouracil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Fluorouracil has been analyzed with a reversed-phase ion-pair liquid chromatographic system applying PRP-1 as the stationary phase. A valve switching technique was applied for the separation of the analyte and some other chemotherapeutic agents. The described procedure gives a rapid screening for the analyte in urine and plasma samples without interferences from late eluting solutes. Biological samples are pretreated by means of a liquid-liquid extraction resulting in a recovery of about 52% for plasma and urine with minimum detectable amounts of about 5ng/ml. The sensitivity and the selectivity of the procedure allows the monitoring of fluorouracil in body fluids and subsequent pharmaco-kinetic studies of the fluoropyrimidine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262089
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  • 2
    Electronic Resource
    Electronic Resource
    Liquid chromatographic capacity factor as an indicator of lipophilicity in a series of betablocker drugs (1986)
    Springer
    Chromatographia 22 (1986), S. 48-50 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Betablocker drugs ; Lipophilicity ; Capacity factors ; Distribution coefficients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The reverse-phase, high-pressure liquid chromatographic capacity factors (k') of a series of 18 betablocking agents were determined in order to establish correlations with their distribution coefficient values (D), obtained from four bibliographic sources. Under the three pH conditions studied (3.5, 6.2 and 7.5) statistically significant linear correlations (p〈 0.002) between log k' and log D values were obtained for the four series studied. In this series it is concluded that the k' factor is a useful and reliable relative lipophilicity parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257296
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  • 3
    Electronic Resource
    Electronic Resource
    Invetigations into the use of an auxiliary metal ion for indirect amperometri detection (1988)
    Springer
    Chromatographia 25 (1988), S. 162-166 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion chromatography ; Analysis of metal ions ; Post column derivatisation ; Amperometric detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method for determination of metal ions subsequent to separation by ion chromatography has previously been developed. The method is based on Indirect Amperometric Detection whereby the decrease in the oxidation current, due to a dithiocarbamate ligand added post column, is monitored. Upon elution from the chromatographic column the metal ions are complexed by the ligand. As the complexes formed are electroinactive at the applied potential, the background current decreases according to the metal ion concentration. The method developed in this work involves addition to the reagent of Zn(II) as a auxiliary metal ion to displace the analyte metals from the chromatographic eluent ligand complexes after separation. Sodium bis(2-hydroxy-ethyl) dithiocarbamate was used as the postcolumn derivatising reagent. The addition of Zn(II) to the reagent causes some unforeseen behaviour in the chromatographic system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02316437
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  • 4
    Electronic Resource
    Electronic Resource
    Crocheted PTFE reactors for post-column photochemistry in HPLC (1986)
    Springer
    Chromatographia 22 (1986), S. 231-234 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Post-column reactor ; Crosheted PTFE construction ; Photochemical reaction detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Construction of crocheted photochemical reactors for use in high performance liquid chromatography is described. The design of these reactors is optimal for low intensity light sources because of their cylindrical configuration. Band broadening is minimized by the use of tightly crocheted narrow bore tubing and fittings modified to reduce dead volume. These reactors are suitable for most post-column photochemical reactions with the additional possibility of serving as mixing/delay coils, deoxygenation devices for electrochemical detectors, and as low dispersion detector cells for chemiluminesckent reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268764
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  • 5
    Electronic Resource
    Electronic Resource
    Separation of chlorophylls and their degradation products in marine phytoplankton by reversed-phase high-performance liquid chromatography (1987)
    Springer
    Chromatographia 23 (1987), S. 26-30 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ammonium acetate buffer eluent ; Chlorophylls and degradation products ; Marine phytoplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An RP-HPLC procedure which separates chlorophylls and their degradation products is described. By employing an amonium acetate buffered mobile phase and a linear gradient elution, complex mixtures of chloroand phaeopigments are separated in less than 30 minutes. The method has been applied to the control of chlorophyll enzymatic degradation in cultures of two algal species, and has also been successfully used in the analysis of algal xanthophylls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310413
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of oligosaccharides (DP1-DP8) in samples with high content of salt and organic matter by reversed phase HPLC (1987)
    Springer
    Chromatographia 23 (1987), S. 557-560 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Oligosaccharides ; Interference by salts ; Complex biological samples ; Enzymatic assays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is described for the determination of oligosaccharides in samples of high salt content by RP-HPLC with water as eluent and refractive index detection. The samples, mussel processing wastes which are used as media for microfungus and yeast cultures and hence for enzymatic assays (amilolitic capacity) of these microorganisms that develop within the wastes, have been treated with ethanol to precipitate the macromolecular organic matter and desalted by a modified mixed bed resin before chromatographic analysis is carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324863
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  • 7
    Electronic Resource
    Electronic Resource
    Silanol group effect of alkylnitrile (cyano) bonded phase in high-performance liquid chromatography (1988)
    Springer
    Chromatographia 25 (1988), S. 419-422 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Cyano bonded phases ; Residual silanol groups ; Diethyldithiocarbamates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary When a cyano bonded phase is used together with a nonaqueous eluent, it is universal that the silanol groups which remain at the surface of the silica gel after bonding affect the retention of solutes. With solutes containing such atoms as N, S and O, hydrogen bond may form between the solute and the residual silanol group, leading to dual retention mechanism. Based on the understanding of retention mechanism, methods were developed to separate metal-diethyldithiocarbamate (DDTC) chelates and crown ethers on cyano bonded phase, the mobile phase being a nonaqueous solvent containing triethylamine (TEA).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324785
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  • 8
    Electronic Resource
    Electronic Resource
    Diffusion inside particles in HPLC columns (1986)
    Springer
    Chromatographia 22 (1986), S. 319-328 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Mass transfer coefficients ; Diffusion inside packing materials ; Comparison of liquid-solid and liquid-liquid systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The stationary zone mass transfer coefficient (C5) in the reduced plate height equation has been determined experimentally for an adsorption and a partition system generated on the same column. Longitudinal diffusion terms (B-terms) were measured on these systems by applying the arrested elution method. The experimentally determined C5 terms for the LLC system are 4–6 times lower than for the LSC system. B-terms for the LLC system were found to be dependent on capacity ratios and were substantially larger than the B-term for the LSC system, which turned out to be independent of capacity ratios. The obstruction factor (γip) for the intraparticle pore space was estimated by fitting the experimentally determined effective diffusion coefficients according to a mass transfer equation for packed beds. This equation was obtained by transforming a known expression for heat transfer in packed beds. Knowledge of γp allows the prediction of the magnitude of the stationary zone mass transfer (C5-term) and the comparison between the experimental and predicted values. The agreement is good in the LSC system. In the LLC system the predicted and experimental C5 values for capacity ratios up to k′=2.00 are well matched, whereas the difference becomes larger from k′=3 on. This paper explains why the efficiency of straight phase LSC systems is often substantially surpassed by analogous LLC systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268783
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  • 9
    Electronic Resource
    Electronic Resource
    Liquid chromatographic retention of homologous alkanes in the two states of C18-bonded reversed phase silicas (1986)
    Springer
    Chromatographia 22 (1986), S. 103-108 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Bonded phase structure ; Phase transition ; Homologous series
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary LiChrosorb Si100 densely grafted with octadecylmonofunctional reagents and the similar commerical LiChrosorb RP 18 have been studied in RP-HPLC, with water-methanol mobile phases at different temperatures. They exhibit a phase transition revealing two different states of bonded film as we have previously shown on densely grafted C18 or C22 macroporous silicas. The measurement of the capacity factors of the alkane homologous series indicated a discontinuity in the plot (logK′, N) at a critical number whose value is dependent on temperature. Two different forms of these curves can be observed above and below the transition, revealing the influence of bonded film state on the retention mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257309
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of synthetic procedures for the chemical modification of alumina for HPLC (1989)
    Springer
    Chromatographia 28 (1989), S. 565-568 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; New bonded phases ; Alumina ; Protein separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Several reactions are tested for the chemical modification of alumina. These include the following: chlorination of the surface hydroxyls followed by reaction with an organolithium compound; chlorination of the surface hydroxyls followed by reaction with a Grignard reagent; chlorination of the surface hydroxyls followed by reaction with an amine; chlorination of the surface hydroxyls followed by reaction with an alcohol; direct reaction of the alumina with an organochloroalane and direct reaction of the alumina with an alcohol. Only the first reaction gave a product which contained enough bonded organic material to be easily detected by FTIR. Preliminary stability tests show that the product of the first reaction retains the bonded organic material when exposed to nonpolar and polar organic solvents as well as aqueous solutions of pH 1.0, 7.0 and 12.0. Chromatographic testing establishes reversed-phase behavior for alkylarylketones as solutes and the bonded phase displays good biocompatibility for a series of protein standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260678
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