Thermal Analysis with Pharmaceutical Applications

Karen Griffin, Senior Analytical Chemist, Impact Analytical

Thermal analysis techniques are used to characterize the properties of crystalline solids and identify polymorphs. These techniques can also be used to study the effects of lyophilization on a test material. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) are two of the main instrumentation used for thermal analysis of pharmaceutical products. The DSC provides a wide range of information on a test material by monitoring endothermic and/or exothermic events (e.g. glass transition (Tg), melting point (MP), decomposition) at either isothermal or dynamic temperature profile. Test materials can be solids, semi-solids and liquids and the atmosphere can be nitrogen or air. The TGA is commonly used in conjunction with the DSC results. The TGA monitors weight of the test material over a temperature range or over time at a specific temperature. A sharp exothermic peak in a DSC thermogram may be attributed to crystallization or decomposition of the test material. For decomposition, the TGA thermogram would show a corresponding decrease in the weight of the test material over the equivalent temperature range. CLICK BELOW TO READ FULL PAPER


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