Title |
Acid–base equilibria and solubility of loratadine and desloratadine in water and micellar media
|
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Published in |
Journal of Pharmaceutical & Biomedical Analysis, October 2008
|
DOI | 10.1016/j.jpba.2008.09.043 |
Pubmed ID | |
Authors |
Gordana Popović, Mira Čakar, Danica Agbaba |
Abstract |
Acid-base equilibria in homogeneous and heterogeneous systems of two antihistaminics, loratadine and desloratadine were studied spectrophotometrically in Britton-Robinson's buffer at 25 degrees C. Acidity constant of loratadine was found to be pK(a) 5.25 and those of desloratadine pK(a1) 4.41 and pK(a2) 9.97. The values of intrinsic solubilities of loratadine and desloratadine were 8.65x10(-6) M and 3.82x10(-4) M, respectively. Based on the pK(a) values and intrinsic solubilities, solubility curves of these two drugs as a function of pH were calculated. The effects of anionic, cationic and non-ionic surfactants applied in the concentration exceeding critical micelle concentration (cmc) on acid-base properties of loratadine and desloratadine, as well as on intrinsic solubility of loratadine were also examined. The results revealed a shift of pK(a) values in micellar media comparing to the values obtained in water. These shifts (DeltapK(a)) ranged from -2.24 to +1.24. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Denmark | 1 | 1% |
Unknown | 84 | 99% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Bachelor | 10 | 12% |
Other | 9 | 11% |
Student > Master | 9 | 11% |
Researcher | 8 | 9% |
Student > Ph. D. Student | 7 | 8% |
Other | 20 | 24% |
Unknown | 22 | 26% |
Readers by discipline | Count | As % |
---|---|---|
Pharmacology, Toxicology and Pharmaceutical Science | 30 | 35% |
Chemistry | 15 | 18% |
Medicine and Dentistry | 8 | 9% |
Chemical Engineering | 3 | 4% |
Agricultural and Biological Sciences | 2 | 2% |
Other | 3 | 4% |
Unknown | 24 | 28% |