TY  - JOUR
AU  - Čudina, Olivera
AU  - Janković, Ivana
AU  - Comor, Mirjana
AU  - Vladimirov, Sote
PY  - 2006
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/712
AB  - In this study, the interaction of the anion of quinapril (QUIN), angiotensin converting enzyme (ACE) inhibitor, with cationic surfactant cetyltrimethylammonium bromide (CTAB) was investigated. The effect of cationic micelles on the spectroscopic and acid-base properties of QUIN was studied at pH 8. The binding of QUIN anion to CTAB micelles implied a shift in drug acidity constant (pK(a)(water) - pK(a)(micelle) = 1.39) proving the great affinity of negatively charged QUIN ion for the positively charged CTAB micelle surface. The strong dependence of the partition coefficient K-x on QUIN concentration, obtained by using pseudo-phase model, is consistent with an adsorption-like phenomenon. From the dependence of differential absorbance at lambda = 272 nm on CTAB concentration, by using mathematical model that treats the solubilization of QUIN anion as its binding to specific sites in the micelles (Langmuir adsorption isotherm), the binding constant K-b = (2.3 +/- 0.4) x 10(3) mol(-1) dm(3) was obtained. QUIN-CTAB binding constant was also calculated from micellar liquid chromatography (MLC) and this method was found to be not accurate enough for its determination.
PB  - Academic Press Inc Elsevier Science, San Diego
T2  - Journal of Colloid and Interface Science
T1  - Interaction of quinapril anion with cationic surfactant micelles of cetyltrimethylammonium bromide
VL  - 301
IS  - 2
SP  - 692
EP  - 696
DO  - 10.1016/j.jcis.2006.05.025
ER  - 

@article{
author = "Čudina, Olivera and Janković, Ivana and Comor, Mirjana and Vladimirov, Sote",
year = "2006",
abstract = "In this study, the interaction of the anion of quinapril (QUIN), angiotensin converting enzyme (ACE) inhibitor, with cationic surfactant cetyltrimethylammonium bromide (CTAB) was investigated. The effect of cationic micelles on the spectroscopic and acid-base properties of QUIN was studied at pH 8. The binding of QUIN anion to CTAB micelles implied a shift in drug acidity constant (pK(a)(water) - pK(a)(micelle) = 1.39) proving the great affinity of negatively charged QUIN ion for the positively charged CTAB micelle surface. The strong dependence of the partition coefficient K-x on QUIN concentration, obtained by using pseudo-phase model, is consistent with an adsorption-like phenomenon. From the dependence of differential absorbance at lambda = 272 nm on CTAB concentration, by using mathematical model that treats the solubilization of QUIN anion as its binding to specific sites in the micelles (Langmuir adsorption isotherm), the binding constant K-b = (2.3 +/- 0.4) x 10(3) mol(-1) dm(3) was obtained. QUIN-CTAB binding constant was also calculated from micellar liquid chromatography (MLC) and this method was found to be not accurate enough for its determination.",
publisher = "Academic Press Inc Elsevier Science, San Diego",
journal = "Journal of Colloid and Interface Science",
title = "Interaction of quinapril anion with cationic surfactant micelles of cetyltrimethylammonium bromide",
volume = "301",
number = "2",
pages = "692-696",
doi = "10.1016/j.jcis.2006.05.025"
}

Čudina, O., Janković, I., Comor, M.,& Vladimirov, S.. (2006). Interaction of quinapril anion with cationic surfactant micelles of cetyltrimethylammonium bromide. in Journal of Colloid and Interface Science
Academic Press Inc Elsevier Science, San Diego., 301(2), 692-696.
https://doi.org/10.1016/j.jcis.2006.05.025

Čudina O, Janković I, Comor M, Vladimirov S. Interaction of quinapril anion with cationic surfactant micelles of cetyltrimethylammonium bromide. in Journal of Colloid and Interface Science. 2006;301(2):692-696.
doi:10.1016/j.jcis.2006.05.025 .

Čudina, Olivera, Janković, Ivana, Comor, Mirjana, Vladimirov, Sote, "Interaction of quinapril anion with cationic surfactant micelles of cetyltrimethylammonium bromide" in Journal of Colloid and Interface Science, 301, no. 2 (2006):692-696,
https://doi.org/10.1016/j.jcis.2006.05.025 . .

TY  - JOUR
AU  - Čudina, Olivera
AU  - Comor, Mirjana
AU  - Janković, IA
PY  - 2005
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/588
AB  - A simple, precise and sensitive reverse-phase high performance liquid chromatographic (RP-HPLC) method has been developed for the quantitation of bifonazole, an imidazole antifungal, simultaneously with benzyl alcohol, used as preservative, in pharmaceutical formulations. Method employed Zorbax Eclipse XDB-C18 (250x4.6 mm i.d., 5 mu m) column, methanol-ammonium acetate (pH 2; 65 mM) (65:35, v/v, pH(*) 3.6) as mobile phase with flow rate of 1 mL min(-1) and variable UV detection at 220 and 252 nm. The proposed method was validated by testing its linearity, selectivity, recovery, repeatability, LOD/LOQ values and it was successfully employed for the determination of bifonazole and benzyl alcohol in pharmaceutical cream-based formulations.
PB  - Springer Heidelberg, Heidelberg
T2  - Chromatographia
T1  - Simultaneous determination of bifonazole and benzyl alcohol in pharmaceutical formulations by reverse-phase HPLC
VL  - 61
IS  - 7-8
SP  - 415
EP  - 418
DO  - 10.1365/s10337-005-0524-9
ER  - 

@article{
author = "Čudina, Olivera and Comor, Mirjana and Janković, IA",
year = "2005",
abstract = "A simple, precise and sensitive reverse-phase high performance liquid chromatographic (RP-HPLC) method has been developed for the quantitation of bifonazole, an imidazole antifungal, simultaneously with benzyl alcohol, used as preservative, in pharmaceutical formulations. Method employed Zorbax Eclipse XDB-C18 (250x4.6 mm i.d., 5 mu m) column, methanol-ammonium acetate (pH 2; 65 mM) (65:35, v/v, pH(*) 3.6) as mobile phase with flow rate of 1 mL min(-1) and variable UV detection at 220 and 252 nm. The proposed method was validated by testing its linearity, selectivity, recovery, repeatability, LOD/LOQ values and it was successfully employed for the determination of bifonazole and benzyl alcohol in pharmaceutical cream-based formulations.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Chromatographia",
title = "Simultaneous determination of bifonazole and benzyl alcohol in pharmaceutical formulations by reverse-phase HPLC",
volume = "61",
number = "7-8",
pages = "415-418",
doi = "10.1365/s10337-005-0524-9"
}

Čudina, O., Comor, M.,& Janković, I.. (2005). Simultaneous determination of bifonazole and benzyl alcohol in pharmaceutical formulations by reverse-phase HPLC. in Chromatographia
Springer Heidelberg, Heidelberg., 61(7-8), 415-418.
https://doi.org/10.1365/s10337-005-0524-9

Čudina O, Comor M, Janković I. Simultaneous determination of bifonazole and benzyl alcohol in pharmaceutical formulations by reverse-phase HPLC. in Chromatographia. 2005;61(7-8):415-418.
doi:10.1365/s10337-005-0524-9 .

Čudina, Olivera, Comor, Mirjana, Janković, IA, "Simultaneous determination of bifonazole and benzyl alcohol in pharmaceutical formulations by reverse-phase HPLC" in Chromatographia, 61, no. 7-8 (2005):415-418,
https://doi.org/10.1365/s10337-005-0524-9 . .