TY - JOUR
T1 - X-ray powder diffractormetry in combination with principal component analysis - A tool for monitoring solid state changes
AU - Kogermann, Karin
AU - Veski, Peep
AU - Rantanen, Jukka Tapio
AU - Naelapaa, Kaisa
PY - 2011/7/17
Y1 - 2011/7/17
N2 - In this study a combined approach of analysing structural changes and elucidating the kinetics of the phase transformations by X-ray powder diffractometry (XRPD) and Raman spectroscopy with principal component analysis (PCA) during ball-milling was investigated. The effect of thermal and mechanical stress on three crystalline forms of piroxicam (PRX) was investigated with particular interest in preparation of amorphous form. Quench cooling of a melt, and ball-milling at room and low temperature were used for amorphisation. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used for explaining the thermal behaviour of the samples. Partial amorphisation, the formation of anhydrous PRX form III (PRXAH III) and its transformation to anhydrous PRX form I (PRXAH I) were detected during ball-milling of anhydrous PRX forms at room temperature. However, ball-milling of PRX monohydrate (PRXMH) induced partial dehydration and amorphisation of the material. Ball-milling at low temperature produced amorphous PRX from PRXAH forms and only partially amorphous PRX from PRXMH, presumably due to the plasticising effect of the less bound water of crystallisation.
AB - In this study a combined approach of analysing structural changes and elucidating the kinetics of the phase transformations by X-ray powder diffractometry (XRPD) and Raman spectroscopy with principal component analysis (PCA) during ball-milling was investigated. The effect of thermal and mechanical stress on three crystalline forms of piroxicam (PRX) was investigated with particular interest in preparation of amorphous form. Quench cooling of a melt, and ball-milling at room and low temperature were used for amorphisation. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used for explaining the thermal behaviour of the samples. Partial amorphisation, the formation of anhydrous PRX form III (PRXAH III) and its transformation to anhydrous PRX form I (PRXAH I) were detected during ball-milling of anhydrous PRX forms at room temperature. However, ball-milling of PRX monohydrate (PRXMH) induced partial dehydration and amorphisation of the material. Ball-milling at low temperature produced amorphous PRX from PRXAH forms and only partially amorphous PRX from PRXMH, presumably due to the plasticising effect of the less bound water of crystallisation.
KW - Former Faculty of Pharmaceutical Sciences
U2 - 10.1016/j.ejps.2011.05.001
DO - 10.1016/j.ejps.2011.05.001
M3 - Journal article
C2 - 21575718
SN - 0928-0987
VL - 43
SP - 278
EP - 289
JO - Norvegica Pharmaceutica Acta
JF - Norvegica Pharmaceutica Acta
ER -