Thermal analysis methods are well-established techniques in research laboratories of pharmaceutical industry. The robustness
and sensitivity of instrumentation, the introduction of automation and of reliable software according to the industrial needs
widened considerably the areas of applications in the last decade. Calibration of instruments and validation of results follow
the state of the art of cGMP as for other analytical techniques. Thermal analysis techniques are especially useful for the
study of the behavior of the poly-phasic systems drug substances and excipients and find a unique place for new delivery systems.
Since change of temperature and moisture occur by processing and storage, changes of the solid state may have a considerable
effect on activity, toxicity and stability of compounds. Current requirements of the International Conference of Harmonisation
for the characterization and the quantitation of polymorphism in new entities re-enforce the position of thermal analysis
techniques. This challenging task needs the use of complementary methods. Combined techniques and microcalorimetry demonstrate
their advantages. This article reviews the current use of thermal analysis and combined techniques in research and development
and in production. The advantage of commercially coupled techniques to thermogravimetry is emphasized with some examples.
Authors:E. Radomińska, T. Znamierowska, and W. Szuszkiewicz
In the present article, the results of investigations pertaining to the equilibria which occur in the system Rb 3 PO 4 –Ba 3 (PO 4 ) 2 are described. Its phasediagram was not published previously. There is
Authors:Masoud Nazarian-Samani, Ali Reza Kamali, Mahboobeh Nazarian-Samani, Roohallah Mobarra, and Saber Naserifar
Ni–B binary phasediagram ( Fig. 1 ) [ 1 ] shows several intermetallics of NiB, m -Ni 4 B 3 , o -Ni 4 B 3 , Ni 2 B, and Ni 3 B, respectively. These intermetallics have found interesting applications such as
Authors:Ya-Ting Hsieh, Nai-Tzu Kuo, and Eamor M. Woo
molecular weights and structures of either or both components in the blends. Our present study aimed at probing the phase behavior, phasediagrams, and temperature dependence of blends systems composed of PLLA of two different molecular weights (low and high
Authors:A. Caneiro, L. Mogni, N. Grunbaum, and F. Prado
transformations occurring under the working conditions. For this reason, the resolution of the phasediagram of SOFC materials results very important in the understanding of these properties.
The thermal analysis involves powerful methods that permit the
Authors:D. Kozma, L. Poszáváca, Mária Ács, G. Pokol, and E. Fogassy
The diastereoisomeric salt pair formed between α-phenyl-ethyl-amine and R-1-phenylethylsuccinamic acid were investigated by
physico-chemical methods. Melting and solubility phase diagrams were determined, the coincidence of the eutectic points of
the two phase diagrams were demonstrated. The large difference in physico-chemical properties of the salt pair explains the
efficient enantiomer separation.
Differential scanning calorimetry (DSC) was used to construct phase diagrams of binary mixtures of alkylcyclohexanes and to
characterize metastable phases formed in the binary mixtures. The experimentally measured liquidus curves were compared to
the liquidus curves calculated using ideal solution theory. The measured phase diagrams of pentadecylcyclohexane/nonadecylcyclohexane
and octadecylcyclohexane/nonadecylcyclohexane binary mixtures are consistent with theoretical phase diagrams constructed based
on the assumption that these mixtures form eutectic systems. It was also observed that a metastable phase formed in some binary
mixtures of pentadecylcyclohexane/nonadecylcyclohexane under fast cooling conditions. It is hypothesized that this metastable
phase recrystallizes into the eutectic phase upon heating.