[article]
| Titre : |
The oxidative degradation of keratin (wool and bovine hair) |
| Type de document : |
texte imprimé |
| Auteurs : |
William N. Marmer, Auteur ; Robert L. Dudley, Auteur |
| Année de publication : |
2006 |
| Article en page(s) : |
p. 408-416 |
| Note générale : |
bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
In our development of multiple formulations for alkaline oxidative dehairing, using perborate, percarbonate, and hydrogen peroxide/cyanate systems, we wondered whether all the oxidative dehairing reactions could be described by a single reaction mechanism. The present study investigated the parameters of base concentration, oxidant, and reaction time, and sought evidence for hair immunization (the formation of protein species insoluble in alkaline sulfide) and cystine oxidation. The base likely played two roles, a catalyst for the hydrolysis of the polypeptide backbone and an aid in the swelling of the hair shaft. The disulfide linkages in cystine were oxidatively cleaved by the oxidizing agent and the reaction mechanism was the same for all of the oxidative systems. MALDI TOF/TOF spectrometry indicated that at least some of the cysteine in solubilized keratin liberated from treatment of alkaline peroxide/cyanate remained intact (unoxidized), but proton NMR spectroscopy showed the oxidation of cystine to cysteic acid for all oxidizing systems studied. Base was effective in hydrolyzing the keratin, but the addition of an oxidizing reagent (perborate) increased the amount of hair (wool) solubilized and decreased the amount of solubilized keratin with a MW > 3.5 KDa. The increased rate of alkaline solubilization of wool by incorporation of oxidizing agents suggested that the cleavage of the disulfide linkage further allowed the hair to swell and take up water (and base). |
| En ligne : |
https://drive.google.com/file/d/1b9_UCItRY-s_f5j_9M6w-k_tABqjm7fe/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3971 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 11 (11/2006) . - p. 408-416
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The oxidative degradation of keratin (wool and bovine hair) in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 11 (11/2006)
