Further evidence in support of the elimination reaction as the mechanism of alkaline unhairing / Stephen H. Feairheller in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXI (Année 1976)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXI (Année 1976) . - p. 360-369 Titre : Further evidence in support of the elimination reaction as the mechanism of alkaline unhairing Type de document : texte imprimé Auteurs : Stephen H. Feairheller, Auteur ; Maryann M. Taylor, Auteur ; David G. Bailey, Auteur ; W. W. Windus, Auteur Année de publication : 1976 Article en page(s) : p. 360-369 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bases (chimie) Cystine La cystine est un acide aminé composé de deux unités cystéine liées par un pont disulfure. Epilage Peaux brutes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In view of the continued interest in unhairing, especially as it relates to pollution from the tanning industry, it seemed imperative that we publish additional information that we have accumulated in support of the β-elimination reaction as the mechanism of the initial reactions taking place in hair protein during alkaline unhairing. We feel that workers in the field should have the latest information available about the chemistry of the systems with which they are working. In 1973 we published the results of our research that led us to propose the β-elimination reaction mechanism. This proposal was based on the types and amounts of amino acids either reacting or forming during exposure of hair to various unhairing conditions. We have since accumulated additional evidence that further substantiates that the p-elimination reaction takes place when hair is exposed to alkali with or without additional reagents being present. This additional evidence is divided into three parts : the finding of additional reaction products, primarily amino acid derivatives ; chemical studies on the reaction of cystine itself in alkali ; and studies using radioactive sulfide in an unhairing reaction. Note de contenu : - EXPERIMENTAL : - Reagents and standard compounds - Identifications of new amino acids - Unhairing reactions - Reaction of cystine with saturated lime solution - Reaction of lanthionine with saturated lime solution - Reactions of cystine with equimolar amounts of divalent metal hydroxide solution - Reactions of cystine with lithium, potassium, and sodium hydroxide solutions - S-labeling - RESULTS AND DISCUSSION : - New amino acid derivatives recovered from unhairing bath hydrolysates - Cystine chemistry - Radioisotope studies - Table 1 : Derivatives from reactions of thiols and amines with dehydroalanyl residues - Table 2 : Reaction products of cystine in lime solutions detectable by amino analysis - Table 3 : Reaction products of lanthionine in lime solution detectable by amino acid analysis En ligne : https://drive.google.com/file/d/1EjQoGUJlpks380lMraNbyoS52JH6_kUK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41491 [article]

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