| Titre : |
Analyzing the mechanism and effect of acid protease in wet blue bating process for leather production |
| Type de document : |
texte imprimé |
| Auteurs : |
Hao Li, Auteur ; Jinzhi Song, Auteur ; Deyi Zhu, Auteur ; Yanchun Li, Auteur ; Shan Cao, Auteur ; Jing Xiao, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 10-15 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Biodégradation
Chrome
Collagène -- Détérioration
ConfitageLe confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Propriétés physiques
DesmosineLa desmosine est une structure moléculaire formée par l'association de quatre chaînes latérales de lysine. On la retrouve associée à l'élastine où elle forme des interconnexions (liaisons covalentes) entre les différentes fibres et participe ainsi à ses propriétés mécaniques. (Wikipedia)
Elastine -- Détérioration
Enzymes microbiennes
Hydroxyproline
Peptidases
Résistance chimique
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
In recent years, in order to reduce the pollution produced in beamhouse and tanning sections, more and more tanneries purchase wet blue from other factories in other regions directly used as raw materials for finished leather production thereby those polluted preliminary steps can be eliminated. Therefore, the wet blue bating process is an essential step to minimize the differences of wet blue which are purchased from different regions. In this study, the properties of different acid protease are analyzed for selecting suitable protease used for wet blue bating. The analysis of chromium tolerance of different acid proteases reveals that, Ll and L4 produced from Aspergillus have higher chromium resistance than that of produced from Bacillus. The effect of Ll and L4 on wet blue and collagen shows that the Ll has more excellent performance, in which the molecular weight of functional protein is 48 KD. By SEM and MCT analysis, Ll can successfully disperse the collagen fibers of wet blue. Furthermore, the biodegradation rates of collagen and elastin were 0.006‰ and 0.5‰, respectively. It indicates that the acid protease mainly degraded elastin but not collagen in bating process thereby ensuring production safety. This paper provides the importance references for the application and the basis for the development of mechanism of acid protease in bating process. |
| Note de contenu : |
- EXPERIMENTAL : Materials - determination of chromium tolerance of acid proteases - Pretreatment of wet blue - Physical properties evaluation - Circular dichroism spectrometer analysis - Micro-structure observation - SDS-PAGE analysis - Preparation of enzymatic hydrolysate - Determination of hydroxyproline by HPLC method - Determination of desmosine in the hydrolysate by ELISA method - Calculating the biodegradation rate of collagen and elastin
- RESULTS AND DISCUSSION : Chromuim tolerance evaluation - Physical properties analysis - Effect of L1 and L4 acid protease act on collagen - Enzymatic properties of L1 acid protease - Observation of the porosity or dispersion of collagen fiber (bundle) - Analyze the biodegradation rate of L1 to structural protein in wet blue |
| DOI : |
https://doi.org/10.34314/jalca.v115i1.1463 |
| En ligne : |
https://drive.google.com/file/d/12pIVNJ4YE3q10psriwZc0l0bZLz6G4M7/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33392 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 1 (01/2020) . - p. 10-15
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Analyzing the mechanism and effect of acid protease in wet blue bating process for leather production in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)
