Molecular Mobility and Fragility in Indomethacin: A Thermally Stimulated Depolarization Current Study View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2001-12

AUTHORS

Natália T. Correia, Joaquim J. Moura Ramos, Marc Descamps, George Collins

ABSTRACT

PURPOSE: To show that thermally stimulated depolarization currents (TSDC), which is a dielectric experimental technique relatively unknown in the pharmaceutical scientists community, is a powerful technique to study molecular mobility in pharmaceutical solids, below their glass transition temperature (Tg). Indomethacin (Tg = 42 degrees C) is used as a model compound. METHODS: TSDC is used to isolate the individual modes of motion present in indomethacin, in the temperature range between -165 degrees C and +60 degrees C. From the experimental output of the TSDC experiments, the kinetic parameters associated with the different relaxational modes of motion were obtained, which allowed a detailed characterization of the distribution of relaxation times of the complex relaxations observed in indomethacin. RESULTS: Two different relaxational processes were detected and characterized: the glass transition relaxation, or alpha-process, and a sub-Tg relaxation, or secondary process. The lower temperature secondary process presents a very low intensity, a very low activation energy, and a very low degree of cooperativity. The fragility index (Angell's scale) of indomethacin obtained from TSDC data is m = 64, which can be compared with other values reported in the literature and obtained from other experimental techniques. CONCLUSIONS: TSDC data indicate that indomethacin is a relatively strong glass former (fragility similar to glycerol but lower than sorbitol, trehalose, and sucrose). The high-resolution power of the TSDC technique is illustrated by the fact that it detected and characterized the secondary relaxation in indomethacin, which was not possible by other techniques. More... »

PAGES

1767-1774

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1013339017070

DOI

http://dx.doi.org/10.1023/a:1013339017070

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001905071

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11785699


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