Geopolymers
Inorganic polymeric new materials
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Renu Chadha
Renu Chadha
University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160014, India
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Poonam Arora
Poonam Arora
University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160014, India
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Sushma Gupta
Sushma Gupta
University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160014, India
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Dharamvir Singh Jain
Dharamvir Singh Jain
Department of Chemistry, Panjab University, Chandigarh 160014, India
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Abstract
The work is undertaken to evaluate the effect of Tween 80 on the complexing ability of β-cyclodextrins to encapsulate the poorly soluble antiretroviral agent, nevirapine. The phase solubility diagram indicates 1:1 stoichiometry and is supported by electronspray ionization mass spectrometry. The complexes were characterized by DSC, FT-IR, and XRD in the solid state. The ternary systems were autoclaved before being lyophilized for the best results. Proton NMR suggests that the methyl pyridine ring of the drug is involved in inclusion and enters from the wider side of the cavity which was confirmed by COESY NMR. Solution calorimetry, a direct method to determine the thermodynamic parameters, was used to determine the complexation constant (K) and other thermodynamic properties. The process is associated with negative ΔH and positive ΔS indicating a stable inclusion complex. The value of K follows the order β-CD < HP-β-CD < M-β-CD. The molar enthalpy of solution in autoclaved solid formulation is less endothermic as compared to additive molar enthalpy of solution obtained by summation of enthalpy of solution of individual components suggesting synergistic interaction between the drug and its constituents. A threefold increase of the in vitro permeability flux was observed for binary systems which was elevated to fourfold for autoclaved ternary complexes.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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