Correlation of differential thermal analysis data with the shrinkage temperature of collagen and leather / J. Naghski in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXI (Année 1966)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXI (Année 1966) . - p. 64-74 Titre : Correlation of differential thermal analysis data with the shrinkage temperature of collagen and leather Type de document : texte imprimé Auteurs : J. Naghski, Auteur ; A. Wisnewski, Auteur ; Edward H. Harris, Auteur ; Lee P. Witnauer, Auteur Année de publication : 1966 Article en page(s) : p. 64-74 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Collagène -- Analyse Statistique Température de retrait Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Shrinkage temperture data obtained on suspended specimens of raw hide substance and a variety of commercial leathers are compared with values obtained by measuring the thermodynamic changes using differential thermal analysis. In every instance the correlation between the data of these two methods was statistically highly significant, and it is concluded that they measure the same basic phenomenon. It is suggested that the absolute values for the phase transition measured by DTA be used at the reference for the thermal behavior of collagen and its products. Use of suspended specimens offers a simplified procedure, which could be defined as a method for the measurement of shrinkage temperatures. The use of pressurized equipment permitted the extension of the temperature range to include products shrinking above the boiling point of water (100°C). Note de contenu : - Instrumentation - Sample preparation - Typical leather-water thermogram - Table 1 : Data from DTA and suspension shrinkage temperature measurements - Table 2 : Summary of statistical analysis En ligne : https://drive.google.com/file/d/1SauL0CaRzgRUUDvVv4mq8YD0ZOlxD3f2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37874 [article]

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Fluorescence polarization of dye-labeled collagen : local flexibility in the nonhelical region / D. Quimby in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 510-518 Titre : Fluorescence polarization of dye-labeled collagen : local flexibility in the nonhelical region Type de document : texte imprimé Auteurs : D. Quimby, Auteur ; Lee P. Witnauer, Auteur Année de publication : 1975 Article en page(s) : p. 510-518 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Analyse Colorants Fluorescence Matériaux -- Coloration Mesure Polarisation (lumière) Pronase Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The fluorescent dye derivatives fluorescein isothiocyanate (FI) and 5-dimethylamino-1-naphthalene sulfonyl chloride (DNS) have been covalently bound to collagen. Fluorescence from the FI conjugate is depolarized primarily hy rotation of the dye molecule about the covalent bond joining it to the protein. DNS on the other hand binds tightly to the helical regions of collagen and fluorescence from the DNS conjugate is depolarized hy rotatory diffusional motion in the nonhelical regions of the protein. Variation in pH between 3 and 10.5 has little effect on the degree of fluorescence polarization of the DNS conjugate, indicating that the degree of flexibility in the nonhelical regions remains unchanged in this pH range. Ca2+ ion induces local flexibility in the helical regions of collagen, and removal of the nonhelical regions by pronase treatment seems to render the helical regions more susceptible to perturbation by Ca2+ ions. Note de contenu : - Materials - Dye coupling - Pronase treatement - Equipment and measurements En ligne : https://drive.google.com/file/d/1cQMpUdRnNhm7Rah6-R0GtJ1Ly4TohNlV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38794 [article]

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