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Auteur Piyu Peng |
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Impact of typical surfactants on the collagenolytic and elastinolytic activities of proteases / Yanhong Li in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 7 (07/2015)
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Titre : Impact of typical surfactants on the collagenolytic and elastinolytic activities of proteases Type de document : texte imprimé Auteurs : Yanhong Li, Auteur ; Fenfxiang Luo, Auteur ; Piyu Peng, Auteur ; Bingbing Xu, Auteur Année de publication : 2015 Article en page(s) : p. 227-236 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Cuirs et peaux -- Analyse
Elastine
Enzymes protéolytiquesUne enzyme protéolytique est une enzyme capable de couper une protéine en plusieurs fragments ou peptides. La trypsine, la papaïne, la pepsine, la chymotrypsine, la plasmine, la subtilisine... sont capables de couper une protéine, chaque enzyme étant spécifique de certains sites particuliers de cette protéine. C'est ainsi, par exemple, qu'une immunoglobuline G est découpée par la papaïne en un fragment Fc et deux fragments Fab, comme l'a montré Porter en 1959.
Peptidases
SurfactantsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Most proteases exhibit broad-spectrum activities to all of the protein components of skins, thus, the indiscriminate application of proteases will bring out undue and non-selective loss of skin structural proteins, especially collagen and elastin, and lead to loose and damaged grain. Finding the effective ways to control proteases’ activities against collagen and elastin in leather processes is very important. In this work, the influence of typical surfactants on the collagenolytic and elastinolytic activities of frequently used proteases was investigated, and the mechanism was also discussed. The results indicated that the nonionic surfactants had slight effects and anionic surfactants exhibited quite different behaviors on the collagenolytic and elastinolytic activities of selected proteases. Both collagenolytic and elastinolytic activities of trypsin preparations were obviously inhibited by all selected anionic surfactants, especially SDS and SDBS. For the bacteria proteases, their elastinolytic activities were significantly activated and their collagenolytic activities were inhibited to a variable extent by anionic surfactants. Tanners may effectively control the selective action of proteases to collagen and elastin to achieve different requirements through correctly utilizing surfactants. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Preparation of hide powder-XBR - Preparation of surfactants solutions - Determination of collagenolytic and elastinolytic activities of proteases
- RESULTS : Effects of surfactants on elastinolytic activities of proteases - Effects of surfactants on collagenolytic activities of proteases
- DISCUSSION : Effects of nonionic surfactants on collagenolytic and elastinolytic activities of proteases - Effects of anionic surfactants on collagenolytic and elastinolytic activities of trypsin - Effects of anionic surfactants on collagenolytic activities of bacteria proteases - Effects of anionic surfactants on elastinolytic activities of bacteria proteasesEn ligne : https://drive.google.com/file/d/1SGEuhU_mzLwSOMFBXV-VW76c8QZGlyDf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24376
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 7 (07/2015) . - p. 227-236[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17327 - Périodique Bibliothèque principale Documentaires Disponible A novel recycling technology for chrome shavings : Application of non-swelling acids during dechroming process / Sadaqat Ali Chattha in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 8 (08/2024)
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Titre : A novel recycling technology for chrome shavings : Application of non-swelling acids during dechroming process Type de document : texte imprimé Auteurs : Sadaqat Ali Chattha, Auteur ; Minghui Li, Auteur ; Xu Zhang, Auteur ; Piyu Peng, Auteur ; Chunxiao Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 360-368 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique
Chrome -- Recyclage
Cuirs et peaux -- Déchets -- Recyclage
Déchromage
Extraction (chimie)
Récupération (Déchets, etc.)
Sulfoniques, Acides
Sulfurique, AcideIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : To separate and recycle collagen fibers and chromium from chrome shavings is important for the sustainable development of leather industry. However, the requirement of chromium content for a wide range of industrial applications of the recycled collagen fibers is limited to 50 mg/kg, which is challenging for the current dechroming methods. Hence, the goal of this work was to establish an efficient dechroming method to address this problem based on the OH-replacement and non-swelling acid application principles. In this study, the types of aromatic sulfonic acids and the parameters of the dechroming processes were optimized, and the tanning performance of the recycled chromium was investigated. The results indicated that disposal of the alkali treated chrome shavings with a mixed acids exhibited high dechroming extent and low extent of collagen hydrolysis, and the optimal ratio of sulfuric acid (20%) to optimized non- swelling acid-sulfone sulfonic acid was 7:1 at pH 1.0 and 25°C. The resultant collagen fibers retained their fiber structure and had a maximum hydrolysis extent of 10.6%, with a chromium content of 39.9 mg/kg. Additionally, the chromium in the dechroming filter liquor displayed good alkali precipitation property, and the chromium concentration of the precipitate’s supernatant satisfied the requirements for direct discharge, approximately 1.05 mg/L, and the recovered chromium exhibited good tanning performance. Therefore, the newly developed salt free chrome shavings treatment method is a promising resource recycling technology and may be helpful for the sustainable development of the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Exploring the tanning performance of recycled chrome tanning agent - Analysis and testing - Scanning electron microscope analysis
- RESULTS AND DISCUSSION : Chromium extraction - Utilization of products - Utilization of dechromed collagen fibers
- Table 1 : Effect of acid types on filtration performance (min), moisture content (%) and dechroming extent (%)
- Table 2 : Effect of sulfuric acid (20%, w/w) and SDPSA (50%, w/w) on filtration performance, moisture content, dechroming extent and extent of collagen hydrolysisDOI : https://doi.org/10.34314/brrhvf02 En ligne : https://drive.google.com/file/d/18NEdU3a_YjuWL6e-dbTQ9139bBWJRSSM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41289
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 8 (08/2024) . - p. 360-368[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24767 - Périodique Bibliothèque principale Documentaires Disponible