Volume 37, Issue 8 pp. 1297-1304
Research Article

Crystallization of Piroxicam Solid Forms and the Effects of Additives

Guangpu Liu

Guangpu Liu

Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Odense, Denmark.

Department of Pharmaceutics, School of Pharmaceutical Sciences, Shandong University, Jinan, China.

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Thomas B. Hansen

Thomas B. Hansen

Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Odense, Denmark.

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Haiyan Qu

Corresponding Author

Haiyan Qu

Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Odense, Denmark.

Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Odense, Denmark.===Search for more papers by this author
Mingshi Yang

Mingshi Yang

Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.

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Jari P. Pajander

Jari P. Pajander

Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.

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Jukka Rantanen

Jukka Rantanen

Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.

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Lars P. Christensen

Lars P. Christensen

Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Odense, Denmark.

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First published: 09 July 2014
Citations: 19

Abstract

The relative stabilities of the two anhydrous polymorphs and the monohydrate of piroxicam in ethanol/water mixtures and the crystallization behavior of the solid forms in the presence of 11 additives were studied. At 37 °C, form II is thermodynamically more stable than form I, while the relative stability of form II and the monohydrate depends on the water concentration in the solution. The total Hansen solubility parameter δT and the hydrogen bonding solubility parameter δH of the substances can partly explain the effects of the additives on the crystallization of the solid forms. The additives that selectively promoted the crystallization of form I are the ones with δT and δH parameters similar to those of piroxicam.

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