Effect of sodium chloride on structure of collagen fiber network in pickling and tanning / Li Xinxin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 6 (06/2016) . - p. 230-237 Titre : Effect of sodium chloride on structure of collagen fiber network in pickling and tanning Type de document : texte imprimé Auteurs : Li Xinxin, Auteur ; Ya-Nan Wang, Auteur ; Jing Li, Auteur ; Bi Shi, Auteur Année de publication : 2016 Article en page(s) : p. 230-237 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de sodium Le chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin. On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na). Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène. Collagène Cuirs et peaux -- Analyse Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Porosité Surfaces -- Analyse Tannage organique Wet-white (tannage) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery wastewater usually contains a high salinity due to the use of sodium chloride (NaCl) in curing and pickling. Although some no pickle tanning and salt-free pickling technologies were developed, few of them have been widely used due to relatively poor mechanical and bulk properties of the resultant leathers. Therefore, the role of NaCl in pickling and tanning should be investigated in the first place. In this study, bated pelts were pickled by salt-free pickling and conventional salt-assisted pickling processes, respectively, and then tanned by chrome tanning agent. The hierarchical structures of collagen fiber network of the pickled pelts and leathers were observed by optical microscope and SEM, while the porosity of leathers was measured. The results showed that the fiber bundles of the pelt pickled in the presence of NaCl were more sufficiently dispersed compared with those of salt-free pickled pelt. Both of the chrome tanned leathers had a regular arrangement of collagen fibers, but the leather with salt assisted pickling presented remarkably higher degree of fiber dispersion, as well as larger porosity. Moreover, the role of NaCl in organic tanning using an amphoteric organic tanning agent was investigated. The results also showed that the presence of NaCl in tanning could improve the opening up of collagen fiber network and the porosity of the leather. In general, NaCl used in leather processing presented a positive effect in consideration of leather quality. Note de contenu : - EXPERIMENTAL : Materials - Preparation of pickled pelts - Preparation of tanned leathers (chrome tanned leather and TWT tanned leathers) - Histological staining - Scanning electron microscopy - BET surface area analysis - Capillary flow porometry - Measurement of porosity of pelt/leather - RESULTS AND DISCUSSION : Effect of NaCl on the fibrous network in pickling - Effect of NaCl on the fibrous network in chrome tanning - Effect of NaCl on the fibrous network in tanning with amphoteric organic tanning agent En ligne : https://drive.google.com/file/d/1BP0XLIpHij9jDQmZ5ZbP6TT2jZpnSGXs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26440 [article]

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Raw skin wastes - Used to prepare a collagen fibre adsorbent for the chromatographic separation of flavonoids / Zhang Qixian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 3 (05-06/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 3 (05-06/2014) . - p. 93-98 Titre : Raw skin wastes - Used to prepare a collagen fibre adsorbent for the chromatographic separation of flavonoids Type de document : texte imprimé Auteurs : Zhang Qixian, Auteur ; Li Xinxin, Auteur ; Li Juan, Auteur ; Wenhua Zhang, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2014 Article en page(s) : p. 93-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Adsorption Chromatographie Collagène Cuirs et peaux -- Déchets Flavonoïdes Gel de silice Matériaux poreux Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Séparation (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : To explore the new approach of value-added utilization of tannery skin wastes, a novel column packing material, collagen fibre adsorbent (CFA), was prepared by using skin wastes as raw material. In the present study, the separation application of CFA on flavonoids and its comparison with other current packing materials (silica gel, polyamide, D101 macroporous resin and Sephadex LH-20) were investigated. Rutin and kaempferol were selected as model flavonoids. Static adsorption indicated that the adsorption capacity of CFA to rutin and kaempferol was different, and the extent of adsorption of kaempferol was lower because it has fewer hydroxyl groups/hydrogen-bond reaction sites. In CFA column chromatography separation, the mixture of rutin and kaemoferol could be well separated by stepwise elution with 90% and 50% aqueous ethanol solutions, and their recoveries were 90.02% and 94.60%, respectively. However, in comparison with CFA, rutin and kaempferol could not be well separated and recovered by using silica gel, polyamide and D101 macroporous resin columns. In addition, the cost of CFA is much lower, especially compared with Sephadex LH-20. Therefore, CFA has the potential to be applied as a packing material for separation of flavonoids. Note de contenu : - MATERIALS AND METHODS : Materials and equipments - Preparation of CFA - Static adsorption capability of CFA - RESULTS AND DISCUSSION : Characterization of CFA by SEM analysis - Static adsorption capability of CFA - Chromatographic separation performance of CFA - Price estimation of CFA En ligne : https://drive.google.com/file/d/1qDjmuTspuQTaf7gyPhUobxdXpL6fZ3gu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21528 [article]

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