Thermodynamic investigations on the inclusion complexation of Piroxicam with Cvclodextrin derivatives

被引：4

作者：

Charumanee, S. ^{[1
]}

Weiss-Greiler, P. ^{[2
]}

Wolschmann, P. ^{[2
]}

Viernstein, H. . ^{[3
]}

Titwan, A. ^{[1
]}

Sirithunyaiug, J. ^{[1
]}

Okonogi, S. ^{[1
]}

机构：

[1] Chiang Mai Univ, Fac Pharm, Dept Pharmaceut Technol, Chiang Mai, Thailand

[2] Univ Vienna, Inst Theoret Chem, Vienna, Austria

[3] Univ Vienna, Inst Pharmaceut Technol & Biopharmaceut, Vienna, Austria

来源：

SCIENTIA PHARMACEUTICA | 2005年 / 73卷 / 03期

关键词：

Cyclodextrin; piroxicam; inclusion complexation; solubility enhancement; reaction enthalpy; reaction entropy;

D O I：

10.3797/scipharm.aut-05-13

中图分类号：

R9 [药学];

学科分类号：

1007 ;

摘要：

Thermodynamic studies of piroxicam in aqueous solution complexed with Pcyclodextrin (beta-CD), gamma-cyclodextrin (gamma-CD) and two beta-cyclodextrin derivatives, hydroxypropyl-pcyclodextrin (HP-beta-CD) and methyl-P-cyclodextrin (Me-beta-CD) were performed at different temperatures and pH values using the phase solubility method. The phase solubility diagrams of beta-CD, gamma-CD and HP-beta-CD is of AL- type behavior, indicating the formation of 1:l complexes. The related stability constants range from beta-CD > gamma-CD > Me-beta-CD > HP-beta-CD, respectively. An A(p)-type solubility diagram is observed for Me-beta-CD, indicating the formation of 1: 2 complexes at higher CD concentrations. From the temperature dependence of the equilibrium constants the reaction enthalpies and entropies have been determined. The contributions of the reaction entropies are small and no enthalpy-entropycompensation is observed, except for gamma-CD, where a very small negative reaction entropy could be estimated. Moreover, the influence of the pH value is rather

引用

页码：147 / 161

页数：15

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