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  • Column liquid chromatography  (5)
  • Springer  (5)
  • American Institute of Physics
  • National Academy of Sciences
  • Taylor & Francis
  • 2000-2004
  • 1985-1989  (5)
  • 1950-1954
  • 1935-1939
  • 1986  (5)
Collection
Keywords
Publisher
  • Springer  (5)
  • American Institute of Physics
  • National Academy of Sciences
  • Taylor & Francis
Years
  • 2000-2004
  • 1985-1989  (5)
  • 1950-1954
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Factors affecting adsorption of organic solutes on cellulose acetate in an aqueous solution system (1986)
    Springer
    Chromatographia 22 (1986), S. 55-58 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; 1-Octanol/water partition coefficient ; Cellulose acetate ; Reverse osmosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The adsorption properties of esters, aldehydes, ethers and amides on cellulose acetate, which is commonly used as a reverse osmosis membrane material, in an aqueous solution system were measured by high-performance liquid chromatography. The adsorption property was characterized with the specific retention volume. For a noncyclic homologous series the logarithm of the specific retention volume was linearly correlated with the logarithm of the partition coefficient between 1-octanol and water. The fact that the slopes of these regression lines are almost identical confirms that the dominant effect on adsorption is the hydrophobic interaction between cellulose acetate and the solute molecule. The intercept represents the effect of the polar groups on adsorption. The effect of the polar group decreases as follows: ―C(O)O―, ―CO―, HCON〈 〉 CH3CON〈 〉 ―OH, ―O―.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257298
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  • 2
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatographic separation of hematoporphyrin and its nickel, copper and zinc complexes on octadecyl-bonded stationary phase (1986)
    Springer
    Chromatographia 22 (1986), S. 132-134 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Porphyrin ; Metalloporphyrin ; Hematoporphyrin IX
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The feasibility of reversed-phase high-performance liquid chromatography for the separation of metal complexes of hematoporphyrin IX (Hp) is described. The retention order, Zn-complex〈Hp (free acid)〈 Ni-complex〈Cu-complex, is regular on an octadecylbonded stationary phase with different compositions of an aqueous methanol mobile phase. These four compounds can be successfully separated within about 8 min on a LiChrosorb RP-18 column (250×4-mm i.d.) with a 85:15 (vol/vol) mixture of methanol and phosphate buffer (pH 3) at a flow rate of 1 ml/min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257313
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  • 3
    Electronic Resource
    Electronic Resource
    Non-aqueous, reversed-phase, high-performance, thin-layer chromatography and column liquid chromatography of metal complexes of porphine (1986)
    Springer
    Chromatographia 22 (1986), S. 160-164 
    Details
    ISSN: 1612-1112
    Keywords: Thin layer chromatography ; Column liquid chromatography ; 21H, 23H-Porphine ; Metalloporphyrin complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chromatographic mobility of 21H, 23H-porphine and its Ni(II), Cu(II), Zn(II) and Pd(II) complexes were investigated by high-performance thin-layer chromatography on an octadecyl-bonded, silica gel plate with various polar organic solvents including alcohols, acetonitrile, dimethylsulfoxide and propylenecarbonate. The mobility generally decreases according to the central metal ion of the complex as follows: Zn(II)〉(free porphine)〉Ni(II)〉Pd(II)〉Cu(II). Methanol is a good choice of solvent for the separation of these metal porphine complexes. Successful separation of porphine and the four metal complexes is accomplished within 13 min on a LiChrosorb RP-18 column with methanol eluent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257319
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  • 4
    Electronic Resource
    Electronic Resource
    Elution characteristics of polymeric solutes and inorganic salts in HPLC on a cellulose acetate column (1986)
    Springer
    Chromatographia 22 (1986), S. 341-344 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Size-exclusion chromatography ; Cellulose acetate packing ; Polymer separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The elution characteristics of polymeric solutes or inorganic salts in high-performance liquid chromatography were examined with a cellulose acetate column using water as the mobile phase. Polymeric (PVP, PEG, etc.) and ionic solutes eluted in a shorter time than deuterium oxide. The retention times for polymers decreased continuously as the molecular weight increased. The elution characteristic, of polymers is assumed to be affected mainly by size exclusion effect. The retention times for ionic solutes increased with the concentration of the injected solutions and asymptotically approached some constant values. The retention times were also affected by the valence and/or hydration of the ion. It was suggested tha the exclusion of ionic solutes was caused by electric repulsion and/or hydration of ion. It was recognized that the salts which were excluded more strongly were rejected more effectively by cellulose acetate membrane in reverse osmosis. HgCl2 which is not dissociated in aquous solution was observed to be adsorbed strongly on cellulose acetate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268787
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  • 5
    Electronic Resource
    Electronic Resource
    The determination of lactate, acetate, chloride and phosphate in an intravenous solution by non-suppressed ion chromatography (1986)
    Springer
    Chromatographia 21 (1986), S. 648-650 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Non-suppressed ; Ion Chromatography ; Intravenous solutions ; Acetate, lactate, chloride and phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The determination of acetate, lactate, chloride and phosphate in an intravenous solution is investigated using non-suppressed ion chromatography with indirect UV absorption detection. When phthalate eluents are used with low capacity anion-exchange columns, the above solute species cannot be resolved unless acetonitrile is added to the eluent. Optimum results are obtained with 0.3 mM phthalate (pH 6.0) containing 30% acetonitrile as eluent. The improved resolution with this eluent is attributed to the existence of a partial reversed-phase retention mechanism operating on the unfunctionalised portions of the styrene-divinylbenzene polymeric ion-exchange material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311921
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