Solubilization of cattle and pig hair keratins by reduction with sodium thioglycolate or oxidation with performic acid / Kohkichi Uehara in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 331-337 Titre : Solubilization of cattle and pig hair keratins by reduction with sodium thioglycolate or oxidation with performic acid Type de document : texte imprimé Auteurs : Kohkichi Uehara, Auteur ; Ayako Matsunaga, Auteur ; Katsuhiko Arai, Auteur ; Harukazu Toyoda, Auteur ; Yasumasa Chonan, Auteur Année de publication : 1986 Article en page(s) : p. 331-337 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : With the intention of utilizing solubilized keratins as a biomaterial, the solubilities of cattle and pig hair keratins were studied. Samples of hair were collected from steer hides and pig skins with razors and treated with sodium thioglycolate or performic acid. The effects of concentration of the reducing or oxidizing agent, incubation temperature and time on the solubility of hair keratins were examined. The results obtained were compared with those of human hair reported previously. About 60% of steer hair keratins and 50% of pig hair keratins were dissolved in 0.1M sodium thioglycolate at pH 11 and 35°C after 24 hr incubation. When oxidized with 90% formic acid - 3% hydrogen peroxide, the solubilities of steer hair and pig hair keratins were about 75% and 50% after 6 hr incubation, respectively. When the residues from hair oxidized with performic acid were incubated 0.2M sodium carbonate, additional keratins were dissolved. The total amount was about 95% of steer hair and 90% of pig hair after 24 hr incubation. En ligne : https://drive.google.com/file/d/1dwYqGgXqVaCjvEuPraCMvh3vW2YTM39Q/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9191 [article]

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Solubilization of steer and kip hair recovered by the sirolime process / Kohkichi Uehara in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXII (Année 1987) . - p. 77-85 Titre : Solubilization of steer and kip hair recovered by the sirolime process Type de document : texte imprimé Auteurs : Kohkichi Uehara, Auteur ; Ayako Matsunaga, Auteur ; Katsuhiko Arai, Auteur Année de publication : 1987 Article en page(s) : p. 77-85 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Based on the results reported in the previous paper (1), three kinds of conditions were selected for the solubilization of keratins by oxidative treatment with performic acid and reductive treatment with sodium thioglycolate, and under these conditions, the air recovered by the SIROLIME process was solubilized. The solubilities of the recovered steer and kip was less soluble than that from hairs. The intact and recovered hair from kip was less soluble than that from steer. Further, the intact and recovered hair and fibers from steer and kip were observed with scanning electron microscope. It was shown that the medulla did not occur in fine hair fibers from kip, the ratio of the cross selectional area of medulla to that of cortex was smaller in the recovered hair than in the intact hair, and the cuticle was damaged more vigorously in the case of treatment with performic acid than in the case of treatment with thioglycolate. Amino acid analyses of the hairs recovered from steer and kip by the SIROLIME process revealed that the content of cystine decreased and new amino acid, lanthionine, was formed during the process. The quantity of lanthionine increased as the liming time was prolonged. These results indicate that it is better to adopt the oxidative solubilization method rather than the reductive one with thioglycolate for the intention of the effective utilization of the recovered hair by the modification of solubilized hair keratins. En ligne : https://drive.google.com/file/d/18Roq1jy_Nh-oySmvG4QfbQXr0SATyAIz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8983 [article]

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