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  • Column liquid chromatography  (107)
  • Springer  (107)
  • Blackwell Publishing Ltd
  • Nature Publishing Group
  • 1990-1994  (107)
  • 1970-1974
  • 1990  (107)
Collection
Keywords
Publisher
  • Springer  (107)
  • Blackwell Publishing Ltd
  • Nature Publishing Group
  • Wiley-Blackwell  (2)
Years
  • 1990-1994  (107)
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    Determination of free formaldehyde in nonwovens in the presence of glyoxalic acid and aldehydes (1990)
    Springer
    Chromatographia 29 (1990), S. 21-23 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Formaldehyde ; Reaction detector ; Polymer dispersions ; Nonwovens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method for the determination of free formaldehyde in nonwovens in the presence of interfering components is described. After RP-HPLC separation the water extracted formaldehyde reacts with acetylacetone in a knitted open tube reactor to form a lutidine derivative which is measured, even at low concentrations, by the UV detector. The minimum detectable concentration is 25 μg/kg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261133
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  • 2
    Electronic Resource
    Electronic Resource
    Re-usability of solid-phase extraction columns during the HPLC analysis of some macrolide antibiotics in serum and urine (1990)
    Springer
    Chromatographia 29 (1990), S. 31-34 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Extraction cartridges ; Erythromycin ; Josamycin ; Serum and urine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The re-usability of C18 solid-phase extraction (SPE) cartidges was assessed utilizing two different analytical procedures developed for the analysis of erythromycin and josamycin in human serum and urine. A statistical procedure using confidence intervals was employed in order to determine a 10% change in drug recovery on re-use with a 95% degree of certainty. The results obtained indicated that the SPE cartridges could be successfully re-used up to three times for serum and urine samples containing physiological concentrations of erythromycin base and propionate. However, in the case of josamycin, results were inconsistent after the second re-use of the extraction cartridges for serum samples. Reproducible results, however, were still obtained for urine samples using the same SPE cartridges up to four times. The results indicate that although succesful re-use of SPE cartridges is possible, each drug and associated extraction conditions need to be carefully assessed prior to implementing such re-use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261135
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  • 3
    Electronic Resource
    Electronic Resource
    An LCEC method for the analysis of synthetic amino acids in fruit juices (1990)
    Springer
    Chromatographia 29 (1990), S. 51-53 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Electrochemical detection ; Amino acid enantiomers ; OPA-TATG ; Fruit juices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A fast and simple HPLC-method for the determination of synthetic amino acids in adulterated orange juice has been developed. The amino acid enantiomers were derivatized with a chiral reagent and the derivatives separated on a 3 μm particle size C18 column. An electrochemical detector operating in the oxidative mode was used for detection. The potential at which the derivatives are oxidized was determined by cyclic voltammetry. By using selective (electrochemical) detection it is possible to reduce the sample clean-up to simple centrifugation and filtration steps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261139
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of a mixed-functional silica support for direct injection analysis of drugs in serum by liquid chromatography (1990)
    Springer
    Chromatographia 29 (1990), S. 223-227 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Mixed-functional silica ; Direct serum injection ; Drug analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new mixed-functional silica material has been developed for direct injection analysis of drugs in serum. The mixed-functional material is synthesized from porous silica by three steps; introduction of 3-glycidoxypropyl groups, introduction of phenyl groups, and hydrolysis of the oxirane ring to diol groups. The prepared column packing can be used for direct injection analysis of hydrophobic and hydrophilic drugs in serum over the eluent pH range employed for ordinary siloxane-bonded silica. The recovery of drugs from serum was almost 100%, regardless of the difference in their protein bindings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317908
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  • 5
    Electronic Resource
    Electronic Resource
    A new valve for zone-electrophoretic sample treatment coupled on-line with high performance liquid chromatography (1990)
    Springer
    Chromatographia 29 (1990), S. 217-222 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Sample treatment ; Zone electrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The design of a new valve arrangement for zone-electrophoretic sample treatment (ZEST) coupled online with high performance liquid chromatography is described. Characteristics of this valve, such as the internal heat development as a function of the current, have been investigated. By using quinidine and desipramine as model compounds it is shown that charged compounds can be isolated from biological samples, in about 15 min, with high selectivity. The carry-over of proteins to the analytical column has been compared with the carry-over using a pre-column sample clean-up method. The detection limits of quinidine and hydroquinidine (50 ng/ml), using zone-electrophoretic sample treatment coupled with column liquid chromatography, are in the same range as with direct injections using pre-columns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317907
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  • 6
    Electronic Resource
    Electronic Resource
    Factor analysis and experiment design in high-performance liquid chromatography. IX. Silica vs. chemically bonded phases in normal phase-HPLC (1990)
    Springer
    Chromatographia 29 (1990), S. 259-264 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Factor analysis ; Experimental design ; Chemically bonded and silica phases ; Chalcones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention of a group of 38 E-s-cis and Z-s-cis chalcones on silica vs. nine polar chemically bonded phases is discussed. It was established that the relatively greatest similarity to silica is observed with the NH2, DIOL and CN phases, whereas the chargetransfer type phases and the NO2 one offer a different separation selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317915
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  • 7
    Electronic Resource
    Electronic Resource
    Effective on-line coupling of HPLC and flame-AAS by means of hydraulic high pressure nebulization (1990)
    Springer
    Chromatographia 29 (1990), S. 254-258 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; On-line flame-AAS detection ; Hydraulic high pressure nebulization ; Trace metal speciation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Hydraulic high pressure nebulization is used as an effective way of on-line coupling of HPLC to flame-AAS for speciation of metal compounds in the ng range. Compared to coupling with a conventional nebulizer a signal enhancement by a factor of 7.5 (peak height) and 10.1 (peak area) for copper is obtained. Using an injected volume of 50 μL the detection limits for Cu, Fe, Ni and Cd are below 0.1 μg/mL (=5ng) and for Mg below 0.01 μg/mL (=0.5ng). The effects of HPLC flow-rate and nebulization nozzle diameter on the signal peak height have been investigated. The performance of the system is demonstrated using speciation of iron. A base-line separation of Fe(II) and Fe(III) is achieved within two minutes. Also species changes (Fe acetate to Fe citrate) can be analysed using the proposed system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317914
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  • 8
    Electronic Resource
    Electronic Resource
    Kalman filter deconvolution after cubic splines background removal in the HPLC determination of Cr(III) and Al(III) as 8-hydroxyquinolines (1990)
    Springer
    Chromatographia 29 (1990), S. 269-274 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Kalman filter ; Cubic spline interpolation ; Al(III) and Cr(III)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A procedure for the simultaneous quantitation of Al(III) and Cr(III) ions by reversed-phase HPLC, after pre-column complexation with 8-hydroxyquinoline, is described. The deconvolution of the partially overlapped peaks was by the Kalman filter method which yielded accurate and precise results. Background removal from the chromatograms was by a new approach employing cubic splines as interpolators between the peak valleys. Finally, it is shown that the Kalman filter deconvolution, after subtraction of the background by cubic spline interpolation, allowed quantitation of Al(III) and Cr(III) down to 25 ppb for each metal. These concentrations were not detectable by conventional integration methods due to a very low signal-to-noise ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317917
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of solute hydrophobicity by reversed-phase high performance liquid chromatography using aqueous binary mobile phases (1990)
    Springer
    Chromatographia 29 (1990), S. 275-288 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Hydrophobic parameter ; Capacity factor variation ; Organic modifier concentration ; Displacement model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The dependence of the capacity factor (k′) on the concentration of the organic modifier (D) in the aqueous binary mobile phase in reversed-phase high-performance liquid chromatography has been investigated to evaluate the hydrophobicity of the solute molecule. The r-values, defined as the slope of log k′ vs. log(1/D) plots, were measured for various solutes and related to the non-polar surface area and the partition coefficients. The r-value was found to be a good indication of solute hydrophobicity. Detailed investigation of the results allowed to consider statistically the molecular posture of the solute adsorbed onto the stationary alkyl ligand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317918
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  • 10
    Electronic Resource
    Electronic Resource
    Liquid chromatography with charge transfer complexation (1990)
    Springer
    Chromatographia 29 (1990), S. 419-428 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Acceptor-Donor complexes ; Selectivity enhancement ; Physical properties/retention correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The paper describes the retention changes observed when an organic acceptor is added to the mobile phase of a liquid chromatography system. The capacity factor decrease depends on the donor character of the solute. Correlations with ionization potentials, HOMO energies and half wave oxidation potentials demonstrate the role of the organic acceptor. According monstrate the role of the organic acceptor. According to the chromatographic properties of the acceptor which is either unretained (TCNE) or slightly retained (TNF) different retention mechanisms are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261388
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