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  • DSC  (74)
  • Springer  (74)
  • American Institute of Physics (AIP)
  • American Physical Society
  • Copernicus
  • 1995-1999  (74)
Collection
Keywords
Publisher
  • Springer  (74)
  • American Institute of Physics (AIP)
  • American Physical Society
  • Copernicus
  • Wiley-Blackwell  (7)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Thermal and spectroscopic characterization of several derivatives containing a new organic ring system (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 665-683 
    Details
    ISSN: 1572-8943
    Keywords: DTA ; DSC ; hydantion ; new ring ; tropane ; X-ray
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Several derivatives containing a new organic ring system, the tropane-6-spiro-5′-hydantoin structure (namely 8-alkyl-8-azabicyclo [3.2.1.] octane-6-spiro-5′-imidazoline-2′,4′-diones) have been characterized by thermal (DSC and simultaneous DTA-TG-DTG) and spectroscopic techniques (IR,1 H-NMR,13 C-NMR). X-ray powder diffraction and elemental analysis were applied for structural and molecular characterization. All the compounds melt in the range 160–250°C and undergo decomposition with progressive mass loss after the solid-liquid thermal transition with molecular degradation. It was found that tropane-6-spiro-5′-hydantoin derivatives with the hydantoin ring in β position are thermally less stable than those containing this ring in α position.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979038
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of enzymatic hydrolysis on functionality of plant proteins (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 831-837 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; enzymatic hydrolysis ; functional properties ; hemisphaericin ; mexicain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract DSC was used to study the extent of denaturation of hemisphaericin and mexicain hydrolysates from corn gluten, soybean and sunflower meals. It was observed that the defatted meals studied exhibited only one broad peak transition. The data obtained demonstrated that the partial protein denaturation found with hemisphaericin or mexicain is correlated to modifications of functional properties. The two enzymes display different modes of action, according to the protein source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996767
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal characterization of polyethylene glycols applied in the pharmaceutical technology using differential scanning calorimetry and hot stage microscopy (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 291-304 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; pharmaceutical technology ; polymer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In the present study, the effect of the molecular weight and thermal treatments on commercial polyethylene glycols (PEG) samples used in the pharmaceutical processing technology, has been analyzed using DSC and HSM. The molecular weight of these polymers range from 1500 to 200000. Thermal investigations on the melting behavior of original PEG samples (as received from the manufacturer) showed only one single melting DSC endotherm effect before 373 K. This fact was associated to the presence of only one type of polymeric chain. Using standard conditions, PEG samples were solidified from the melt at 373 K, either by flash cooling (using liquid nitrogen and an ice bath) and by slow cooling, soaked and by slow cooling at room temperature. They were further studied by DSC. It was found that after cooling, PEG with molecular weight 1500 and 15000 showed DSC thermograms with a single endothermic peak. However, thermograms for PEG 4000 and 6000 produced a splitted melting endotherm. This fact was attributed to the presence of two types of chains, that are the folded and extended chains. Ageing time influences also the shape of the DSC endothermal effects. It was concluded that the endotherms obtained after heating these PEG indicate that the thermal history determine the structure (extended or folded chain type forms) and the degree of crystallinity, as evidenced by changes in heat of fusion values, melting points and structures after crystallization. The relationships between melting enthalpies and melting points, as deduced from DSC diagrams, with molecular weight of the polymers are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979969
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  • 4
    Electronic Resource
    Electronic Resource
    DSC Screening of Potential Prochlorperazine-Excipient Interactions in Preformulation Studies (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1317-1322 
    Details
    ISSN: 1572-8943
    Keywords: cyclodextrins ; drugs ; DSC ; excipients ; prochlorperazine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Differential scanning calorimetry was used to examine the thermal behaviour of mixtures of the drug prochlorperazine with standard excipients, to assess potential interactions, and of mixtures with cyclodextrins, to investigate inclusion complexation which could increase the photostability of the drug. For most of the excipients (magnesium stearate, stearic acid, Explotab®, Ac-Di-Sol®, Encompress® and Ludipress®, lactose and Starch 1500) disappearance or broadening of the melting endotherm of the drug indicated interactions. Lubritab® was the only 'inert' excipient tested. Mixtures of prochlorperazine and the cyclodextrins gave incomplete inclusion complexation as shown by only partial disappearance of the melting endotherm of the drug.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010150305542
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  • 5
    Electronic Resource
    Electronic Resource
    Separation of components of different molecular mobility by calorimetry, dynamic mechanical and dielectric spectroscopy (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 499-511 
    Details
    ISSN: 1572-8943
    Keywords: dielectric spectroscopy (DETA) ; DSC ; dynamic mechanical (DMA) spectroscopy ; glass transition ; PET ; polymers ; relaxation ; rigid amorphous ; temperature modulated DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The relaxation strength at the glass transition for semi-crystalline polymers observed by different experimental methods shows significant deviations from a simple two-phase model. Introduction of a rigid amorphous fraction, which is non-crystalline but does not participate in the glass transition, allows a description of the relaxation behavior of such systems. The question arises when does this amorphous material vitrify. Our measurements on PET identify no separate glass transition and no devitrification over a broad temperature range. Measurements on a low molecular weight compound which partly crystallizes supports the idea that vitrification of the rigid amorphous material occurs during formation of crystallites. The reason for vitrification is the immobilization of co-operative motions due to the fixation of parts of the molecules in the crystallites. Local movements (Β-relaxation) are only slightly influenced by the crystallites and occur in the whole non-crystalline fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987477
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  • 6
    Electronic Resource
    Electronic Resource
    A combined differential scanning calorimeter-optical video microscope for crystallization studies (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 991-998 
    Details
    ISSN: 1572-8943
    Keywords: cryo-microscopy ; crystallization ; DSC ; ICE ; microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A simultaneous differential scanning calorimeter (DSC)-optical video microscope instrument has been developed. The instrument development included slight modifications to the sample head of a Perkin-Elmer DSC-7, along with the use of a CCD camera and magnifying lenses. The instrument permitted simultaneous following of optical and thermal events during isothermal and non-isothermal DSC experiments. The DSC curves were almost identical to those given by a standard DSC-7. The operational temperature range of the instrument is between −160 to 600°C. The capabilities of the DSC-video microscope are illustrated by examples of ice crystallization data in aqueous solutions of glycerol and dimethyl sulphoxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996785
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal decomposition of the magnesium, zinc, lead and niobium chelates derived from 8-quinolinol (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 625-632 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; NMR ; 8-quinolinol compounds ; TG-DTG ; stability ; thermal decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Solid M-Ox compounds, whereM represents Mg(II), Zn(II), Pb(II) and NbO(III), and Ox is 8-quinolinol, have been prepared. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC), nuclear magnetic resonance (NMR) and infrared absorption spectra (IR) have been used to characterize and to study the thermal stability and thermal decomposition of these compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979034
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of Added Urea and Alkylureas on Gel to Liquid-Crystal Transitions in Doab Vesicles (1999)
    Springer
    Journal of thermal analysis and calorimetry 55 (1999), S. 29-35 
    Details
    ISSN: 1572-8943
    Keywords: alkylureas ; DOAB vesicles ; DSC ; gel-liquid transitions ; urea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The gel to liquid-crystal transition for vesicles in aqueous solution formed by dimethyldi-n-octadecylammonium bromide (DOAB) occurs at 44.7°C. Moreover, the shapes of the scans recorded by a sensitive DSC microcalorimeter are very similar when the vesicular solutions are prepared starting with solid DOAB and comparable amounts of either solid urea or solid alkylureas. Therefore, the DOAB vesicles in aqueous solution accommodate this class of solutes without marked changes in the melting temperature and the enthalpy of the transition. The contrast with effects of added surfactants and simple organic solutes such as THF and ethanol is particularly significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010159400429
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal Behaviour of Some Terpenoids (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1353-1357 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; terpenoids ; TG ; thermal behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The terpenoids acetyl sitosterol, lupeol, acetyl diosgenin and stigmasterol were studied. Comparison of the thermogravimetric curves and the activation energies of the terpenoids suggested the following sequence of thermal stability: acetyl sitosterol 〈 acetyl diosgenin 〈 lupeol 〈 stigmasterol. The DSC curves allowed determination of the melting points and the degrees of purity. Comparison of the TG and DSC curves revealed the presence of phase transitions without mass loss that were attributed to rearrangements in the terpenoid molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010110624198
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal investigation of PEG 4000 — oxazepam binary system (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 1743-1753 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; HSM ; oxazepam ; PEG 4000 ; solid dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A thermal study using DSC and Hot Stage Microscopy (HSM) was carried out to investigate the interaction in solid state of the binary system PEG 4000 — oxazepam, and to establish their phase diagram. The eutectic composition, which melting occurs at lower temperature as compared with the pure components, has been determined. The results obtained by DSC and HSM have indicated that PEG 4000 — oxazepam mixtures displays no obvious incompatibilities, and that the system shows a typical eutectic behaviour. However because of the closeness of the melting of PEG 4000 to the eutectic temperature, it was difficult to determine precisely the eutectic composition and temperature on the basis of DSC measurements alone. The use of heats of fusion corresponding to physical mixtures allowed an estimation of the eutectic composition at 6% w/w oxazepam. Additional information of temperature (57.6
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01980920
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