Thermal Behaviour of Diclofenac Sodium: Decomposition and Melting Characteristics.
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- TUDJA Petar
- Department of Pharmaceutical Technology, Research and Development, PLIVA d.d.
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- KHAN M. Zahirul I.
- Department of Pharmaceutical Technology, Research and Development, PLIVA d.d.
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- MEŠTROVIC Ernest
- Department of Pharmaceutical Technology, Research and Development, PLIVA d.d. Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb
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- HORVAT Michaela
- Department of Pharmaceutical Technology, Research and Development, PLIVA d.d.
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- GOLJA Petra
- Department of Analytical Development, Research and Development, PLIVA d.d.
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Abstract
The thermal behaviour and melting characteristics of diclofenac sodium were investigated using various instrumental techniques—differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier-transform infrared (FT-IR) spectroscopy and thin layer chromatography (TLC). DSC analysis of diclofenac sodium performed under dynamic flow of either synthetic air or helium or nitrogen did not produce any sharp endothermic peak characteristic of melting peak of a pure substance. Both the rate of scanning of the sample and the environmental atmospheric condition significantly affected the thermographic profile of diclofenac sodium. An exothermic peak prior to an endothermic peak corresponding to melting of the substance appeared when heated under dynamic flow of synthetic air suggesting oxidation (decomposition) of diclofenac sodium before reaching its melting point. In fact, at a scanning rate of 1 °C/min only the exothermic peak appeared in the thermogram, suggesting complete decomposition prior to melting under the dynamic flow of synthetic air. DSC, FT-IR and TLC data obtained from samples heated under the dynamic flow of either helium or nitrogen revealed formation of a related compound, 1-(2,6-dichlorophenyl)-indolin-2-one, an indol-cyclic amide, as a result of an intramolecular cyclization reaction during the heating process. TGA data demonstrated a loss of 11.4—20.2% of the mass of diclofenac sodium when heated under various environmental conditions, and also supported the oxidative nature of degraded product(s) when the thermal process occurred slowly under a dynamic flow of synthetic air.
Journal
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- Chemical and Pharmaceutical Bulletin
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Chemical and Pharmaceutical Bulletin 49 (10), 1245-1250, 2001
The Pharmaceutical Society of Japan
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Details 詳細情報について
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- CRID
- 1390282679140758144
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- NII Article ID
- 110003615769
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- NII Book ID
- AA00602100
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- COI
- 1:CAS:528:DC%2BD3MXnt1Cksbo%3D
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- ISSN
- 13475223
- 00092363
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- NDL BIB ID
- 5926535
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- PubMed
- 11605648
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed