Solid-state properties of drugs. III. Differential scanning calorimetry of chiral drug mixtures existing as racemic solid solutions, racemic mixtures or racemic compounds

1992 ◽  
Vol 86 (2-3) ◽  
pp. 221-230 ◽  
Author(s):  
M. Elsabee ◽  
R.J. Prankerd
Keyword(s):  
Differential Scanning Calorimetry ◽  
Solid State ◽  
Solid Solutions ◽  
Scanning Calorimetry ◽  
Drug Mixtures ◽  
Racemic Mixtures ◽  
Chiral Drug

scholarly journals Теплоемкость твердых растворов системы Er-=SUB=-2-=/SUB=-Ge-=SUB=-2-=/SUB=-O_7- Er-=SUB=-2-=/SUB=-Sn-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=- в области 350-1000 K

2019 ◽  
Vol 61 (4) ◽  
pp. 660
Author(s):  
Л.Т. Денисова ◽  
Л.А. Иртюго ◽  
В.В. Белецкий ◽  
Н.В. Белоусова ◽  
В.М. Денисов
Keyword(s):  
Solid Solution ◽  
Differential Scanning Calorimetry ◽  
Solid State ◽  
Specific Heat ◽  
Solid Solutions ◽  
Thermodynamic Functions ◽  
Solution Composition ◽  
Scanning Calorimetry ◽  
Solid Solution Composition ◽  
Effects Of Temperature

AbstractEr_2Ge_2O_7–Er_2Sn_2O_7 solid solutions have been obtained using solid-state synthesis by burning the stoichiometric mixtures of the initial oxides in air in the temperature range of 1273–1473 K. The effects of temperature and solid solution composition on the specific heat have been examined by differential scanning calorimetry. The Er_2Ge_2O_7 thermodynamic functions have been calculated.

One-Step Simultaneous Differential Scanning Calorimetry-FTIR Microspectroscopy to Quickly Detect Continuous Pathways in the Solid-State Glucose/Asparagine Maillard Reaction

2013 ◽  
Vol 96 (6) ◽  
pp. 1362-1364 ◽  
Author(s):  
Deng-Fwu Hwang ◽  
Tzu-Feng Hsieh ◽  
Shan-Yang Lin
Keyword(s):  
Differential Scanning Calorimetry ◽  
Solid State ◽  
Maillard Reaction ◽  
Reaction Pathway ◽  
Molar Ratio ◽  
Maillard Reaction Products ◽  
Reaction Products ◽  
Scanning Calorimetry ◽  
Ftir Microspectroscopy ◽  
Amadori Product

Abstract The stepwise reaction pathway of the solid-state Maillard reaction between glucose (Glc) and asparagine (Asn) was investigated using simultaneous differential scanning calorimetry (DSC)-FTIR microspectroscopy. The color change and FTIR spectra of Glc-Asn physical mixtures (molar ratio = 1:1) preheated to different temperatures followed by cooling were also examined. The successive reaction products such as Schiff base intermediate, Amadori product, and decarboxylated Amadori product in the solid-state Glc-Asn Maillard reaction were first simultaneously evidenced by this unique DSC-FTIR microspectroscopy. The color changed from white to yellow-brown to dark brown, and appearance of new IR peaks confirmed the formation of Maillard reaction products. The present study clearly indicates that this unique DSC-FTIR technique not only accelerates but also detects precursors and products of the Maillard reaction in real time.

The solid state isomerization and thermal decomposition of pentamminethiocyanatocobalt(III) salts [Co(NH3)5SCN] X2 (X = Cl, SCN)

1974 ◽  
Vol 27 (7) ◽  
pp. 1391 ◽  
Author(s):  
MR Snow ◽  
RJ Thomas
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Solid State ◽  
Thermogravimetric Analysis ◽  
Water Solution ◽  
Scanning Calorimetry ◽  
Thiocyanate Complex ◽  
Lower Temperature ◽  
Intramolecular Process ◽  
Tracer Experiments

Radiochemical tracer experiments show that in the thiocyanate complex, [Co(NH3)5SCN] [SCN]2, thermal isomerization to the isothiocyanate salt proceeds with incorporation of anionic thiocyanate. At least 45% of the isomerization process proceeds by a dissociative path. This contrasts with the mechanism in water solution where isomerization occurs without exchange with thiocyanate in solution. The result also shows the inadequacy of the generally made assumption that isomerization in the solid state is an intramolecular process. The chloride and thiocyanate salt were subjected to simultaneous thermogravimetric analysis and differential scanning calorimetry. The thiocyanate salt deamminates at a much lower temperature (from 100�C) than the chloride (from 160�C), but no process corresponding to the isomerization could be detected.

PHASE TRANSFORMATIONS DURING HEATING OF AMORPHOUS/NANOCRYSTALLINE Ni–Ti POWDERS

2010 ◽  
Vol 24 (09) ◽  
pp. 1137-1140 ◽  
Author(s):  
M. M. VERDIAN ◽  
M. SALEHI ◽  
K. RAEISSI
Keyword(s):  
Differential Scanning Calorimetry ◽  
Solid State ◽  
Phase Transformations ◽  
Low Energy ◽  
Heating Process ◽  
Study Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Niti Phase

Amorphous/nanocrystalline 50 Ni –50 Ti powders were synthesized from elemental Ti and Ni powders by solid state synthesis utilizing low energy mechanical alloying with times up to 100 h. The produced powders were investigated by X-ray diffraction and differential scanning calorimetry to study phase transformations that occurred during heating in the calorimeter. It was found that at the first stage of the heating process, a disordered NiTi phase was formed at temperature of about 400°C. Further investigations indicated that this phase transformed into the Ni 3 Ti and Ti 2 Ni intermetallic compounds after heating at a temperature of about 800°C.

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