Collagenases and their inhibitors : a review / Sijin Wu in COLLAGEN AND LEATHER, Vol. 5 (2023)  

[article]  inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 20 p. Titre : Collagenases and their inhibitors : a review Type de document : texte imprimé Auteurs : Sijin Wu, Auteur ; Xuewei Zhou, Auteur ; Zhicheng Jin, Auteur ; Haiming Cheng, Auteur Année de publication : 2023 Article en page(s) : 20 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antienzymes Collagénases Les collagénases sont des enzymes capables de rompre les liaisons peptidiques du collagène. Elles facilitent la destruction des structures extracellulaires lors de la pathogenèse bactérienne. Ce sont des exotoxines. La production de collagénases peut être induite lors d'une réponse immunitaire, par les cytokines qui stimulent les cellules telles que les fibroblastes et les ostéoplastes et occasionnent indirectement des lésions tissulaires. Cuirs et peaux Enzymes microbiennes Epilage enzymatique Métalloprotéinases Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hide and skin are complex tissue where the most abundant component is collagen. Matrix metalloproteinases and bacterial collagenases are two kinds of collagenases that can cleave the triple-helical domain of native fibrillar collagens. In this paper, the family members and domain composition of matrix metalloproteinases and bacterial collagenases are summarized. The catalytic mechanism of collagen hydrolysis by collagenases is described, and the methods adopted to date for investigating and regulating collagenases and their inhibitors are reviewed. Furthermore, the applications of collagenases and their inhibitors in biomedicine, food processing and the enzymatic unhairing process in the leather-making industry are presented. Note de contenu : - PROGRESS OF RESEARCH ON COLLAGENASES : research on collagenases - MMPs - Bacterial collagenases - Applications of collagenases - REGULATORY APPROACHES USING COLLAGENASE INHIBITORS : Zinc-binding inhibitors - Non zinc-binding inhibitors - Applications of collagenase inhibitors - Table 1 : Classification of MMP family with their domain organization and substrates preference - Table 2 : Applications of collagenases in the biomedical field - Table 3 : List of inhibitors with different inhibitory principles - Table 4 : List of MMP-13 inhibitors for the treatment of OA - Table 5 : List of bacterial collagenases (ColH) inhibitors DOI : https://doi.org/10.1186/s42825-023-00126-6 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00126-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40069 [article]

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Improving the photostability of bleached silk without reducing its whiteness / Wang Zongqian in COLORATION TECHNOLOGY, Vol. 131, N° 6 (12/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 6 (12/2015) . - p. 439-443 Titre : Improving the photostability of bleached silk without reducing its whiteness Type de document : texte imprimé Auteurs : Wang Zongqian, Auteur ; Weiguo Chen, Auteur ; Xuewei Zhou, Auteur ; Chaonan Liu, Auteur ; Keith R. Millington, Auteur Année de publication : 2015 Article en page(s) : p. 439-443 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Blanchiment Chimie textile Photoabsorption Photostabilité Soie et constituants Index. décimale : 667.3 Teinture et impression des tissus Résumé : Bleached silk is rapidly yellowed by exposure to the ultraviolet radiation present in sunlight. The conventional application of a water-soluble hydroxyphenyl benzotriazole ultraviolet absorber (such as UVFast W) to bleached silk reduces its rate of photoyellowing but has a negative impact on the whiteness of the bleached silk, largely cancelling out the improvements in whiteness achieved during bleaching. Therefore, a series of bleaching processes and aftertreatments using UVFast W on silk were investigated, with the measurement of reflection spectrum, whiteness, yellowness, and strength before and after exposure to ultraviolet radiation. The results show that whiteness of silk treated by oxidation–reduction double bleaching can be increased, and the whiteness of double-bleached silk with 4% UVFast W aftertreatment was even slightly higher than that of the hydrogen-peroxide-bleached silk. After ultraviolet irradiation, double-bleached silk samples with 4% UVFast W treatment resulted in both the highest whiteness and optimum photostability by comparison with unbleached standard silk and hydrogen-peroxide-bleached silk samples with and without 4% UVFast W treatment, and its strength difference was superior to the samples, except for standard silk with 4% UVFast W treatment after exposure to UV radiation for 18 h. Note de contenu : - EXPERIMENTAL : Materials - Oxidative bleaching with hydrogen peroxide - UVFast W treatment process for unbleached and hydrogen-peroxide-bleached silk - UVFast W treatment from a reductive bleach bath - Photostability testing - Yellowness measurement - Whiteness measurement - Colour measurement - Breaking strength test - RESULTS AND DISCUSSION : Colour values of silk and hydrogen-peroxide-bleached silk with and without UVFast W treatment - Colour values of double-bleached silk with and without UVFast W treatment - Photostability of silk and bleached silk with and without UVFast W treatment DOI : 10.1111/cote.12185 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12185 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25090 [article]

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