TY  - JOUR
AU  - Vucković, Gordana
AU  - Tanasković, Slađana
AU  - Janjić, TJ
AU  - Milojković-Opsenica, Dušanka
AU  - Celap, MB
PY  - 1999
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/223
AB  - The effect of enlargement of the chelate ring size in Co(III) complexes containing bidentate aminocarboxylato and/or diamine ligands on their R-F values in salting-out chromatography has been investigated on thin layers of silica gel, cellulose, polyacrylonitrile, and CN-modified silica gel. Salting-out was achieved with aqueous solutions of ammonium sulfate, Enlargement of the chelate ring caused a decrease in the R-F values of the complexes. By use of linear regression analysis and the theory of error propagation it was established that the logarithms of the separation factors of the pairs of compounds investigated were either unaffected or changed only slightly with changing concentration of salt in the mobile phase; this could not be established for certain on the basis of R-F values alone. Complete correlation was established between the chromatographic behavior of the complexes and the previously investigated effect of successive enlargement of the rings in cobalt(III) complexes containing hexadentate ligands of the EDTA type. The corresponding separation mechanism of the pairs of compounds investigated was also considered. It was finally established that the regularities mentioned were independent of the adsorbent used.
PB  - Springer Hungarica Kiado Kft, Budapest
T2  - Journal of Planar Chromatography - Modern TLC
T1  - Effect of increasing the bidentate chelate ring size in Co(III) complexes on their behavior in salting-out TLC on different adsorbents
VL  - 12
IS  - 6
SP  - 461
EP  - 465
UR  - https://hdl.handle.net/21.15107/rcub_farfar_223
ER  - 

@article{
author = "Vucković, Gordana and Tanasković, Slađana and Janjić, TJ and Milojković-Opsenica, Dušanka and Celap, MB",
year = "1999",
abstract = "The effect of enlargement of the chelate ring size in Co(III) complexes containing bidentate aminocarboxylato and/or diamine ligands on their R-F values in salting-out chromatography has been investigated on thin layers of silica gel, cellulose, polyacrylonitrile, and CN-modified silica gel. Salting-out was achieved with aqueous solutions of ammonium sulfate, Enlargement of the chelate ring caused a decrease in the R-F values of the complexes. By use of linear regression analysis and the theory of error propagation it was established that the logarithms of the separation factors of the pairs of compounds investigated were either unaffected or changed only slightly with changing concentration of salt in the mobile phase; this could not be established for certain on the basis of R-F values alone. Complete correlation was established between the chromatographic behavior of the complexes and the previously investigated effect of successive enlargement of the rings in cobalt(III) complexes containing hexadentate ligands of the EDTA type. The corresponding separation mechanism of the pairs of compounds investigated was also considered. It was finally established that the regularities mentioned were independent of the adsorbent used.",
publisher = "Springer Hungarica Kiado Kft, Budapest",
journal = "Journal of Planar Chromatography - Modern TLC",
title = "Effect of increasing the bidentate chelate ring size in Co(III) complexes on their behavior in salting-out TLC on different adsorbents",
volume = "12",
number = "6",
pages = "461-465",
url = "https://hdl.handle.net/21.15107/rcub_farfar_223"
}

Vucković, G., Tanasković, S., Janjić, T., Milojković-Opsenica, D.,& Celap, M.. (1999). Effect of increasing the bidentate chelate ring size in Co(III) complexes on their behavior in salting-out TLC on different adsorbents. in Journal of Planar Chromatography - Modern TLC
Springer Hungarica Kiado Kft, Budapest., 12(6), 461-465.
https://hdl.handle.net/21.15107/rcub_farfar_223

Vucković G, Tanasković S, Janjić T, Milojković-Opsenica D, Celap M. Effect of increasing the bidentate chelate ring size in Co(III) complexes on their behavior in salting-out TLC on different adsorbents. in Journal of Planar Chromatography - Modern TLC. 1999;12(6):461-465.
https://hdl.handle.net/21.15107/rcub_farfar_223 .

Vucković, Gordana, Tanasković, Slađana, Janjić, TJ, Milojković-Opsenica, Dušanka, Celap, MB, "Effect of increasing the bidentate chelate ring size in Co(III) complexes on their behavior in salting-out TLC on different adsorbents" in Journal of Planar Chromatography - Modern TLC, 12, no. 6 (1999):461-465,
https://hdl.handle.net/21.15107/rcub_farfar_223 .

TY  - JOUR
AU  - Pfendt, Lidija
AU  - Janjić, T.J
AU  - Popović, Gordana
PY  - 1995
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/123
AB  - Protolytic equilibria of midazolam in the pH range 0-12 were investigated. Acidity, hydrolysis, equilibrium constants in the heterogeneous system and the solubility of midazolam were determined [I = 0.1 mol l-1 (NaCl), 25 °C]. A spectrophotometric method was developed for the investigation of the mechanism of hydrolysis and the determination of the corresponding equilibrium constants. In addition, buffer characteristics of the two-phase and single-phase midazolam buffers were investigated.
T2  - The Analyst
T1  - Study of protolytic, hydrolytic and solubility equilibria of midazolam
VL  - 120
IS  - 8
SP  - 2145
EP  - 2151
DO  - 10.1039/AN9952002145
ER  - 

@article{
author = "Pfendt, Lidija and Janjić, T.J and Popović, Gordana",
year = "1995",
abstract = "Protolytic equilibria of midazolam in the pH range 0-12 were investigated. Acidity, hydrolysis, equilibrium constants in the heterogeneous system and the solubility of midazolam were determined [I = 0.1 mol l-1 (NaCl), 25 °C]. A spectrophotometric method was developed for the investigation of the mechanism of hydrolysis and the determination of the corresponding equilibrium constants. In addition, buffer characteristics of the two-phase and single-phase midazolam buffers were investigated.",
journal = "The Analyst",
title = "Study of protolytic, hydrolytic and solubility equilibria of midazolam",
volume = "120",
number = "8",
pages = "2145-2151",
doi = "10.1039/AN9952002145"
}

Pfendt, L., Janjić, T.J,& Popović, G.. (1995). Study of protolytic, hydrolytic and solubility equilibria of midazolam. in The Analyst, 120(8), 2145-2151.
https://doi.org/10.1039/AN9952002145

Pfendt L, Janjić T, Popović G. Study of protolytic, hydrolytic and solubility equilibria of midazolam. in The Analyst. 1995;120(8):2145-2151.
doi:10.1039/AN9952002145 .

Pfendt, Lidija, Janjić, T.J, Popović, Gordana, "Study of protolytic, hydrolytic and solubility equilibria of midazolam" in The Analyst, 120, no. 8 (1995):2145-2151,
https://doi.org/10.1039/AN9952002145 . .

TY  - JOUR
AU  - Pfendt, Lidija
AU  - Sladić, Dušan
AU  - Janjić, T.J
AU  - Popović, Gordana
PY  - 1990
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/76
AB  - Acid-base equilibria in heterogeneous and homogeneous systems of some sparingly soluble benzodiazepines (diazepam, prazepam, chlordiazepoxide and medazepam) were investigated in aqueous solution and the corresponding equilibrium constants were determined by the application of pH-metric, spectrophotometric and solubility methods. The sites of protonation were predicted on the basis of the analysis of the corresponding carbon-13 nuclear magnetic resonance spectra. In addition, buffer characteristics of saturated aqueous solutions of these drugs in the presence of the solid phase were investigated and it was established that they possess a very high buffer capacity over a specific pH range.
T2  - The Analyst
T1  - Study of heterogeneous equilibria in saturated aqueous solutions of some 7-chloro-1,4-benzodiazepines
VL  - 115
IS  - 4
SP  - 383
EP  - 387
DO  - 10.1039/an9901500383
ER  - 

@article{
author = "Pfendt, Lidija and Sladić, Dušan and Janjić, T.J and Popović, Gordana",
year = "1990",
abstract = "Acid-base equilibria in heterogeneous and homogeneous systems of some sparingly soluble benzodiazepines (diazepam, prazepam, chlordiazepoxide and medazepam) were investigated in aqueous solution and the corresponding equilibrium constants were determined by the application of pH-metric, spectrophotometric and solubility methods. The sites of protonation were predicted on the basis of the analysis of the corresponding carbon-13 nuclear magnetic resonance spectra. In addition, buffer characteristics of saturated aqueous solutions of these drugs in the presence of the solid phase were investigated and it was established that they possess a very high buffer capacity over a specific pH range.",
journal = "The Analyst",
title = "Study of heterogeneous equilibria in saturated aqueous solutions of some 7-chloro-1,4-benzodiazepines",
volume = "115",
number = "4",
pages = "383-387",
doi = "10.1039/an9901500383"
}

Pfendt, L., Sladić, D., Janjić, T.J,& Popović, G.. (1990). Study of heterogeneous equilibria in saturated aqueous solutions of some 7-chloro-1,4-benzodiazepines. in The Analyst, 115(4), 383-387.
https://doi.org/10.1039/an9901500383

Pfendt L, Sladić D, Janjić T, Popović G. Study of heterogeneous equilibria in saturated aqueous solutions of some 7-chloro-1,4-benzodiazepines. in The Analyst. 1990;115(4):383-387.
doi:10.1039/an9901500383 .

Pfendt, Lidija, Sladić, Dušan, Janjić, T.J, Popović, Gordana, "Study of heterogeneous equilibria in saturated aqueous solutions of some 7-chloro-1,4-benzodiazepines" in The Analyst, 115, no. 4 (1990):383-387,
https://doi.org/10.1039/an9901500383 . .

TY  - JOUR
AU  - Pfendt, Lidija
AU  - Janjić, T.J
AU  - Popović, Gordana
PY  - 1990
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/75
AB  - Protolytic equilibria of flurazepam, a diprotic base which is sparingly soluble in water, were investigated. The investigations were carried out in the pH range 0-12, at constant ionic strength (0.1 M NaCl) and 25 ± 0.1 °C, by the application of spectrophotometric, pH-metric and solubility methods. The acidity, hydrolysis and equilibrium constants in the heterogeneous system were determined. In addition, a method, based on the application of a formation function to the hydrolytic process, is proposed. Finally, buffer characteristics of flurazepam in the homogeneous and heterogeneous systems were studied.
T2  - The Analyst
T1  - Study of protolytic equilibria of flurazepam
VL  - 115
IS  - 11
SP  - 1457
EP  - 1462
DO  - 10.1039/an9901501457
ER  - 

@article{
author = "Pfendt, Lidija and Janjić, T.J and Popović, Gordana",
year = "1990",
abstract = "Protolytic equilibria of flurazepam, a diprotic base which is sparingly soluble in water, were investigated. The investigations were carried out in the pH range 0-12, at constant ionic strength (0.1 M NaCl) and 25 ± 0.1 °C, by the application of spectrophotometric, pH-metric and solubility methods. The acidity, hydrolysis and equilibrium constants in the heterogeneous system were determined. In addition, a method, based on the application of a formation function to the hydrolytic process, is proposed. Finally, buffer characteristics of flurazepam in the homogeneous and heterogeneous systems were studied.",
journal = "The Analyst",
title = "Study of protolytic equilibria of flurazepam",
volume = "115",
number = "11",
pages = "1457-1462",
doi = "10.1039/an9901501457"
}

Pfendt, L., Janjić, T.J,& Popović, G.. (1990). Study of protolytic equilibria of flurazepam. in The Analyst, 115(11), 1457-1462.
https://doi.org/10.1039/an9901501457

Pfendt L, Janjić T, Popović G. Study of protolytic equilibria of flurazepam. in The Analyst. 1990;115(11):1457-1462.
doi:10.1039/an9901501457 .

Pfendt, Lidija, Janjić, T.J, Popović, Gordana, "Study of protolytic equilibria of flurazepam" in The Analyst, 115, no. 11 (1990):1457-1462,
https://doi.org/10.1039/an9901501457 . .