Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2486703 | Journal of Pharmaceutical Sciences | 2009 | 12 Pages |
Abstract
The dehydration of different commercial brands of dibasic calcium phosphate dihydrate (DCPD; CaHPO4·2H2O) was examined over a range of temperatures and water vapor pressures. To determine the main factors affecting the physical stability of DCPD, the baseline characterization of DCPD and dibasic calcium phosphate anhydrate (DCPA; CaHPO4) was conducted by thermogravimetric analysis, differential scanning calorimetry and X-ray diffractometry. The surface area and the DCPA content (present as an impurity) depended on the commercial source of DCPD. The larger particles contained a higher concentration of DCPA and the anhydrate exhibited a concentration-dependent acceleratory effect on the dehydration of DCPD. Unlike DCPD, DCPA is physically stable and resisted hydration even when dispersed in water for over 7 months in the temperature range of 4-50°C. In dosage forms containing DCPD, there is a potential for phase transformation to DCPA, while the reverse transition, that is, DCPA â DCPD appears to be extremely unlikely. Thus, the risk of physical transformation can be minimized by using DCPA in formulations.
Keywords
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Authors
Tamaki Miyazaki, Kannan Sivaprakasam, Jaidev Tantry, Raj Suryanarayanan,