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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 857-862 
    ISSN: 1572-8943
    Keywords: analytical methods ; kinetics ; powder milk ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This work present comparative results on powder milk storage quality, obtained from analytical methods. Protein content was determined conventional (Kjeldahl) and colorimetric with biuret reagent at 540 nm and integral quality by thermogravimetric and biological methods. A method was developed for the protein separation of powder milk. Powder milk was submitted to degradation processes at 45, 60 and 80°C for 20 days. The results indicated that protein content values were inconsistent if determinations by Kjeldahl and colorimetric methods and biological tests were compared. There is evidence of thermal decomposition of powder milk as detected by biological and thermogravimetric methods.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-8943
    Keywords: bismuth ; calorimetry ; dithiocarbamate ; enthalpy ; phosphorous
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The standard molar enthalpy of formation of crystalline di-isobutyldithiocarbamate complexes of P, As, Sb and Bi(III) has been derived by solution calorimetry at 298.15 K. The corresponding standard molar enthalpies of sublimation were estimated by means of differential scanning calorimetry. From the standard molar enthalpies of formation of the gaseous chelates the homolytic and heterolytic mean metal-sulphur bond-dissociation enthalpies were calculated.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1353-1357 
    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
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 657-661 
    ISSN: 1572-8943
    Keywords: anti-hypertensive drugs ; quality control ; thermal analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The present work reports studies of the thermal behaviour of some anti-hypertensive drugs. Their purities were determined by DSC and specialized pharmacopeial methods. The activation energy values suggest the following sequence of satability: nifedipine〉propanolol hydrochloride〉captoril. Analysis of the DSC data indicated that the degrees of purity of nifedipine, captopril and propanolol hydrochloride were similar to those found by pharmacopeial methods BP 93 and USP 23. The simplicity, speed and low operational costs of thermal analysis justify its application in the quality control of pharmaceutical drugs.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1323-1327 
    ISSN: 1572-8943
    Keywords: chloramphenicol ; DSC ; quality control ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The stability and thermal behaviour of chloramphenicol and various of its mixtures were investigated. The thermogravimetric and stability constant results showed that the chloramphenicol base is thermally more stable than the tablet in the studied formulation. The reduction in stability was attributed to the presence of starch in the formulation. The thermal decompositions of the chloramphenicol base and the tablet obey first-order kinetics.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2018-06-01
    Description: Resumo A maquiagem mineral é uma formulação cosmética que traz dentre seus componentes matérias-primas minerais a exemplo dos materiais argilosos, sendo as argilas bentonitas mais comumente utilizadas. O uso de argilas bentoníticas do estado da Paraíba no desenvolvimento de formulações de pó mineral para maquiagem foi o objetivo central deste trabalho. Estas argilas foram estudadas também em sua forma organofílica. Inicialmente foi realizada a caracterização físico-química das argilas bentoníticas naturais e organofilizadas, e os resultados indicaram que as argilas apresentam perfil tecnológico com potencial cosmético. Para formulação cosmética foi utilizado 50% de cada uma das argilas e demais componentes minerais, dando origem a seis diferentes formulações. A partir destas amostras foi estudado seu comportamento estável frente a condições extremas de temperatura. O controle de qualidade toxicológico e microbiológico foi realizado de acordo com os padrões descritos pela Agência Nacional de Vigilância Sanitária (ANVISA) e Farmacopéia Brasileira. As amostras foram testadas para investigação da irritabilidade oftálmica por meio de ensaio in vitro da membrana corioalantóide do ovo da galinha (HET-CAM), e os ensaios microbiológicos foram feitos pelo método de plaqueamento em superfície. Todas as amostras apresentaram-se estáveis quanto às suas características físico-químicas. Nenhuma das formulações apresentou citotoxicidade. O controle microbiológico assegurou a segurança biológica com ausência de bactérias.
    Print ISSN: 0366-6913
    Electronic ISSN: 1678-4553
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by SciELO Brazil
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