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  • Column liquid chromatography  (89)
  • Springer  (89)
  • Nature Publishing Group
  • Societe Geologique de France
  • 1990-1994  (86)
  • 1980-1984  (3)
Collection
Keywords
Publisher
  • Springer  (89)
  • Nature Publishing Group
  • Societe Geologique de France
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    A particle size distribution analysis of used HPLC column packing material (1993)
    Springer
    Chromatographia 35 (1993), S. 295-301 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Used column packings ; Particle size distribution ; Scanning electron microscopy ; Column age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Particle size distribution analysis and scanning electron microscopy (SEM) were carried out on eight used HPLC columns containing either irregular silica based, spherical silica based or spherical polymer based packing material. Particle size distributions of the used irregular silica based columns were at least bimodat at the outlet ends and either biomodal or log-normal at the inlet ends with regular progressions between the two extremes through the column. A new ODS-3 column showed log-normal size distributions from the inlet to the outlet ends. Spherical silica based column particle size distributions showed distinct shoulders on large central distribution peaks in most column sections with various degrees of shoulder erosion. The spherical resin based column showed a broader inlet particle size distribution progressing to a very narrow outlet distribution. SEMs of both irregular and spherical silica based columns revealed a larger number of undersized particles and debris at the outlet than inlet ends which could have resulted from stationary phase degradation, since this was not seen in the new ODS-3 column. While several SEMs of the spherical silica based columns revealed hollow spheres and twins, the spherical resin based column packing showed stress fractures or wrinkle lines resulting from use or dehydration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277513
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  • 2
    Electronic Resource
    Electronic Resource
    Catalytic hydrogenation of benzo(a) and benzo(e) pyrenes. Analysis of the hydrogenated products by charge transfer chromatography and HPLC on amino bonded phase (1990)
    Springer
    Chromatographia 30 (1990), S. 24-34 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Charge transfer separations ; Hydrogenated polycyclic aromatics ; Coal liquefaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Hydroaromatics (partially hydrogenated polycyclic aromatic hydrocarbons) generated in the course of the process play an important role in the catalytic hydroliquefaction of coal. A difficult analytical task is to identify and to quantify these hydroaromatics among the preponderant polycyclic aromatic hydrocarbons. Generally speaking, the method carried out uses the specific separation of hydroaromatic by charge transfer chromatography. Structural identification is effected by using gas chromatography, alone or coupled with mass spectrometry, and HPLC on amino bonded phase with UV detection. As an aid to obtaining the standard compounds that are essential in that work, this paper describes the application of the above analytical procedure to the catalytic hydrogenation products (RhCl3/NaBH4 and Pd/C) of benzo(a) and benzo(e)pyrenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02270444
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  • 3
    Electronic Resource
    Electronic Resource
    A particle size distribution analysis of stressed HPLC column packing material (1991)
    Springer
    Chromatographia 31 (1991), S. 362-366 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Particle size distribution ; Stationary phase stress ; Silica gel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A particle size distribution analysis has been completed on three different HPLC column packing materials including silica gel (Si60) and two bonded phases (RP8 and RP18). The stationary phases were subjected to 18 hours stress with 1 N or 3 N KOH and found to have quantitatively different distribution patterns initially, at 13 hours and finally at 18 hours although the average particle diameters for the Si60 and RP8 were the same or higher at 18 hours as initially. Thirteen hoursstress with sodium octanesulfonate, tetrabutylammonium phosphate and ammonium acetate at exaggerated conditions also resulted in distributional changes with the Si60 and RP8 decreasing in average particle diameter when exposed to ammonium acetate and tetrabutylammonium stressing respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262193
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  • 4
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatographic determination of furfural and hydroxymethylfurfural in apple juices and concentrates (1991)
    Springer
    Chromatographia 32 (1991), S. 45-48 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Furfural ; Hydroxymethylfurfural ; Apple juice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A rapid and sensitive method for determining 2-furaldehyde (FUR) and 5-hydroxymethyl-2-furaldehyde (HMF) in apple juices and juice concentrates has been developed. The method for FUR and HMF involves the solid-liquid extraction of the juice by using a C-18 cartridge prior to reversed-phase separation with detection at 280 nm. The mobile phase was acetonitrile-water (8/92, v/v) at a flow rate of 1.0 ml/min. Recoveries from apple juices and juice concentrates spiked at different levels ranged from 94.1 to 104.0 (FUR) and 94.5 to 100.5 (HMF). The quantification limit for both, FUR and HMF, was 5 ppb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262465
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of amino acids in apple extracts by high performance liquid chromatography (1990)
    Springer
    Chromatographia 29 (1990), S. 155-160 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Amino acids ; O-phthaldialdehyde-2-mercaptoethanol ; Apples
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A rapid and sensitive method for the simultaneous determination of primary amino acids in apple is described. After sample preparation, amino acids were derivatized with o-phthaldialdehyde/2-mercaptoethanol and separated on a reversed phase column with a gradient of phosphate buffer-tetrahydrofuran-methanol as the mobile phase. Detection was carried out with a fluorescence detector at excitation and emission wavelengths of 340 nm and 425 nm respectively. Recovery studies showed good results for all substances (91–109%) (with coefficients of variation ranging, from 0.1 to 9.0%). This method was applied to the monitoring of amino acids during the ripening of apples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268703
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  • 6
    Electronic Resource
    Electronic Resource
    Rapid separation of polycyclic aromatic hydrocarbons by packed column supercritical fluid chromatography (1994)
    Springer
    Chromatographia 39 (1994), S. 607-611 
    Details
    ISSN: 1612-1112
    Keywords: Supercritical fluid chromatography ; Column liquid chromatography ; Polycyclic aromatic hydrocarbons ; Environmental samples
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The separation in 6 minutes of the sixteen US Environmental Protection Agency (EPA) polycyclic aromatic hydrocarbons (PAHs) on a single packed column by supercritical fluid chromatography (SFC) is described and compared to that obtained using liquid chromatography with the same column. Several environmental samples containing polycyclic aromatic hydrocarbons obtained from various sources including soil, water, petrochemicals and coal have been analysed by SFC under optimised conditions. Packed column SFC is shown to be an efficient and promising method for the rapid monitoring of environmental polycyclic aromatic hydrocarbons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268288
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  • 7
    Electronic Resource
    Electronic Resource
    Semi-preparative purification and characterization of peptides from complex haemoglobin hydrolysate by HPLC-mass spectrometry (1990)
    Springer
    Chromatographia 30 (1990), S. 205-210 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Semi-preparative scale purification ; Fast atom bombardment-M S ; Tandem-M S ; Peptic haemoglobin hydrolysate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An important goal of previous high-performance liquid chromatography (HPLC) studies was the development of a simple procedure for the purification of peptides from very complex haemoglobin enzymatic hydrolysates. This report demonstrates that the separation system described can be used for large sample loadings at laboratory preparative scale (more than 50 mg) without loss of resolution. The efficiency of peptide purification was shown by fast atom bombardment-mass spectrometry (FAB-MS) and tandem mass spectrometry (tandem M S). The procedure described will be of interest in the biotechnology area for the extensive preparation of peptides for fine applications from complex enzymatic hydrolysates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274548
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  • 8
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatographic determination of cymiazole in honey with UV and electrochemical detection (1994)
    Springer
    Chromatographia 39 (1994), S. 602-606 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Narrow bore columns ; Cymiazole ; Honey ; Solid-phase extraction ; UV and electrochemical detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An HPLC method for determination of cymiazole in honey using a narrow bore C18 column is described. Preconcentration and sample cleaning were achieved by using solid-liquid extraction with SCX Bond Elut cartridges. The performance of UV and amperometric (EC) detector systems were also compared. The detection limits with UV and EC detectors were 1.7 and 0.7 μg kg−1 respectively. Average recoveries obtained with UV and EC detectors were 91.2% and 86.1% with a standard deviation of 3.8% and 12.5% respectively. In spite of its higher sensitivity the EC detector is not suitable for this type of analysis because of its lack of reproducibility and the long analysis time required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268287
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of pressure on sorption equilibrium: HPLC column packing-mixed eluent (1984)
    Springer
    Chromatographia 18 (1984), S. 668-672 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Mixed eluents ; Preferential sorption of eluents ; Pressure effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Pronounced base line perturbations were repeatably observed in LC both in alternating recycling and in backflushing experiments when binary eluents and refractometric detectors were used. The perturbations which we call eigenzones appeared immediately after operating the recycling or the backflushing valve, and their size and shape depended on the nature of both the column filling and the mixed mobile phase as well as on the pressure drop across the column. Experimental results presented confirm that the primary causes of the eigenzones were the pressure changes in the columns which influenced the sorption equilibrium of mixed eluent components within the column packing. Some practical consequences of this effect are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265811
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  • 10
    Electronic Resource
    Electronic Resource
    The synthesis and characterization of aliphatic sulfonic acid cation exchangers for HPLC (1984)
    Springer
    Chromatographia 18 (1984), S. 216-220 
    Details
    ISSN: 1612-1112
    Keywords: Cation exchangers ; Column liquid chromatography ; Exchange capacity, determination ; Organic peroxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Two oxidation procedures for the synthesis of silicabased aliphatic sulfonic acid cation-exchangers for HPLC are described. Several reaction conditions for oxidizing a terminal-bonded thiol with organic peroxides are provided along with their yields, capacities, reproducibility, and chromatographic behavior. Also, three methods for determining exchange capacity are discussed, and their relationship to the capacity factors of charged solutes is compared. The maximum capacity determined by the titration of the bonded silica was 0.34 meq/gram. The general problems of synthesizing cation-exchangers, measuring their efficiencies and exchange capacities, and evaluating their overall performances are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276736
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