Detailed Information on Publication Record
2004
RETENTION BEHAVIOUR OF BASIC AZAARENES IN REVERSED-PHASE HPLC ON OCTADECYLSILICA STATIONARY PHASES
ŠIMEK, Zdeněk and Kamila KOČÍBasic information
Original name
RETENTION BEHAVIOUR OF BASIC AZAARENES IN REVERSED-PHASE HPLC ON OCTADECYLSILICA STATIONARY PHASES
Name in Czech
Retenční chování bazických azaarénů v RP-HPLC
Authors
ŠIMEK, Zdeněk (203 Czech Republic, guarantor) and Kamila KOČÍ (203 Czech Republic)
Edition
Riva del Garda, Italy, 27th international symposium on Capillary chromatography, p. R.32, 1 pp. 2004
Publisher
Research institute for Chromatography
Other information
Language
English
Type of outcome
Stať ve sborníku
Field of Study
10406 Analytical chemistry
Country of publisher
Czech Republic
Confidentiality degree
není předmětem státního či obchodního tajemství
Organization unit
Faculty of Science
Keywords in English
azaarenes; octadecylsilica stationary; retention behaviour
Změněno: 31/1/2006 12:53, doc. RNDr. Zdeněk Šimek, CSc.
V originále
The retention behaviour of two- and three-ring azaarenes on octadecylsilica stationary phases has been studied. The experiments were carried out with eight basic azaarenes-acridines under isocratic elution conditions using buffered mobile phase with 60 % (v/v) of methanol. The effect of the varying mobile phase pH and the buffer concentration on the solute retention has been investigated over a range of eluent pH from 2,5 to 7,5. The retention behaviour of the acridines was evaluated with respect to their hydrophobicity (log KOW), acid-base properties (pKA) and regarding the surface properties of the selected stationary phases. Purospher Star RP 18e (Merck) and Zorbax Eclipse XDB-C18 (Agilent Technologies) were tested (Engelhardt, Galushko) to determine the column silanole activity and hydrophobicity. The Purospher Star RP 18e higher both silanole activity and hydrophobicity than the Zorbax Eclipse XDB-18 has shown. The retention as a function of eluent pH was evaluated using equations based on solute ionisation. Serious deviations from the theory for all tested acridines were observed. It is a confirmation of their complex retention mechanism in which not only hydrophobic but also other interactions participate. Anomalous retention patterns of some acridines in low eluent pH (<3,5) with different buffer concentrations has been observed. This is probably related with the presence of the positively charged sites existing on the tested phases in low mobile-phase pH with low ionic strength. The elution behaviour within acridines of uniform hydrophobicities has shown to be directly correlated with their acid-base properties, corresponding to their potentials for silanophilic interactions: isomers with higher pKA values were less retained.
In Czech
The retention behaviour of two- and three-ring azaarenes on octadecylsilica stationary phases has been studied. The experiments were carried out with eight basic azaarenes-acridines under isocratic elution conditions using buffered mobile phase with 60 % (v/v) of methanol. The effect of the varying mobile phase pH and the buffer concentration on the solute retention has been investigated over a range of eluent pH from 2,5 to 7,5. The retention behaviour of the acridines was evaluated with respect to their hydrophobicity (log KOW), acid-base properties (pKA) and regarding the surface properties of the selected stationary phases. Purospher Star RP 18e (Merck) and Zorbax Eclipse XDB-C18 (Agilent Technologies) were tested (Engelhardt, Galushko) to determine the column silanole activity and hydrophobicity. The Purospher Star RP 18e higher both silanole activity and hydrophobicity than the Zorbax Eclipse XDB-18 has shown. The retention as a function of eluent pH was evaluated using equations based on solute ionisation. Serious deviations from the theory for all tested acridines were observed. It is a confirmation of their complex retention mechanism in which not only hydrophobic but also other interactions participate. Anomalous retention patterns of some acridines in low eluent pH (<3,5) with different buffer concentrations has been observed. This is probably related with the presence of the positively charged sites existing on the tested phases in low mobile-phase pH with low ionic strength. The elution behaviour within acridines of uniform hydrophobicities has shown to be directly correlated with their acid-base properties, corresponding to their potentials for silanophilic interactions: isomers with higher pKA values were less retained.
Links
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