Efficient and ecological leather processing : replacement of lime and sulphide with dispase assisted by 1-allyl-3-methylimidazolium chloride / Hui Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 13 p. Titre : Efficient and ecological leather processing : replacement of lime and sulphide with dispase assisted by 1-allyl-3-methylimidazolium chloride Type de document : texte imprimé Auteurs : Hui Liu, Auteur ; Keyong Tang, Auteur ; Xiumin Li, Auteur ; Jie Liu, Auteur ; Xuejing Zheng, Auteur ; Ying Pei, Auteur Année de publication : 2022 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux Sulfurée Chlorure de 1-allyl-3-méthylimidazolium Cuirs et peaux -- Industrie -- Aspect de l'environnement Cuirs et peaux -- Propriétés physiques Cuirs et peaux de bovins Dispase est une protéase qui clive la fibronectine , le collagène IV et dans une moindre mesure le collagène I. Elle se trouve dans certaines bactéries et peut être isolée à partir de filtrats de culture de Bacillus polymyxa . Il peut être extrait, purifié et utilisé dans la recherche. Il peut être particulièrement utile de séparer les épithéliums embryonnaires et le mésenchyme . La Dispase II est spécifique du clivage des liaisons leucine - phénylalanine . La Dispase est souvent utilisée pour digérer les cellules primaires adhérentes en culture, car ce traitement s'est avéré plus doux que la digestion à la trypsine. (Wikipedia) Eaux usées -- Analyse Epilage Produits chimiques -- Suppression ou remplacement Ressources renouvelables Stabilité hydrothermale Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is a collagen-based biomass prepared from raw skins or hides by a series of unit operations, in which the unhairing and fiber opening are extremely important operations. However, the conventional Na2S/Ca(OH)2 system used in unhairing and fiber opening has given rise to the pollution to the environment. It is necessary to develop substitute technology for the Na2S/Ca(OH)2. In the present study, 1-allyl-3-methylimidazolium chloride ([AMIm]Cl) was used to cooperate with dispase for cycle unhairing and one-pot beamhouse to recycle waste bovine hides and compared with conventional processing. During those processes, the mechanism of [AMIm]Cl-dispase synergistic unhairing and collagen fibers opening were studied. Besides, plant hazard, organic matter and [AMIm]Cl of wastewater from [AMIm]Cl-dispase process were respectively investigated and separated to evaluate the environmental and economic benefits of the [AMIm]Cl-dispase process. As a result, enzyme activity after unhairing by [AMIm]Cl-diapase system for using 5 times is higher than that by KCl-dispase system, and needs lower unhairing time, which is because of rapid penetration of [AMIm]Cl-dispase solution in bovine hides. For this reason, the tensile strength and elastic modulus of tanned leather from [AMIm]Cl-dispase process are higher than those from the KCl-diapase and conventional processes, and its hydrothermal shrinkage temperature is comparable to that of the conventional one. Because of the 58.13% lower wastewater discharge (WD), 66.60% lower total solids (TS), 97.23% lower ammonia nitrogen (NH3-N), non-toxic wastewater and organic matter recovery in wastewater are reached from [AMIm]Cl-dispase process, which is expected to be an alternative to the conventional process to reduce environmental pollution and realize the sustainable development of technology for leather manufacturing. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Experimental and conventional processes - Investigation of the dispase penetration by FITC - Organic matter and saline solution separation in wastewater - The harm of wastewater to plant growth - RESULTS AND DISCUSSION : Effect of [AMIm]Cl-dispase synergistic cycle unhairing - Effect of [AMIm]Cl-dispase ecological beamhouse - Hydrolysis of interfibrillar substance in hides - Distribution of dispase - Mechanism of one-pot beamhouse and recovery of organic matter in wastewater - Grain morphology and collagen fibers aggregation structure of tanned leathers - Physical and hydrothermal properties of tanned leather - Environmental and economic benefits Table 1 : Physical properties and hydrothermal stability of tanned leathers from conventional (C), KCl-dispase (KCl/D) and [AMIm]Cl-dispase ([AMIm]Cl/D) processes - Table 2 : Pollutant loads and wastewater discharge (WD) from different methods (unit: kg/t of raw hide) DOI : https://doi.org/10.1186/s42825-022-00086-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00086-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37580 [article]

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Structure, extraction, processing, and applications of collagen as an ideal component for biomaterials - a review / Qijue Chen in COLLAGEN AND LEATHER, Vol. 5 (2023)  

[article]  inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 27 p. Titre : Structure, extraction, processing, and applications of collagen as an ideal component for biomaterials - a review Type de document : texte imprimé Auteurs : Qijue Chen, Auteur ; Ying Pei, Auteur ; Keyong Tang, Auteur ; Madalina Georgiana Albu-Kaya, Auteur Année de publication : 2023 Article en page(s) : 27 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux Collagène -- Structure Extraction (chimie) Systèmes auto-assemblés Index. décimale : 574.192 Biochimie Résumé : Collagen with a multi-hierarchical architecture exhibits powerful biological performance, thus being developed in biomedical applications as a processing building block. The isolated collagen after extraction from biological tissues can be processed into various forms such as fibrils, scaffolds, membranes, microspheres, hydrogels, and sponges for further use in specific applications. This review briefly discusses the multi-hierarchical structure, powerful biological performances, extraction, and processing approaches of collagen as a natural biomaterial. The processing of collagen including dissolution, self-assembly, cross-linking, and electrospinning, is discussed to show more feasibility for specific applications of collagen composite biomaterials. Further emphasis is directed towards the biomedical applications of drug and gene delivery, as well as tissue repair involving bone, cartilage, vascular, and corneal, along with wound healing. Additionally, there is a focus on the development of flexible sensors and electronic skins (e-skins). Furthermore, the potential challenges and perspectives for the development of collagen-based biomaterials are proposed. In short, collagen-based biomaterials are expected to facilitate sustainable development and the next generation of advanced biomaterial applications. Note de contenu : - COLLAGEN SUPERFAMILLY : Collagen types - Hierarchical structure of type I collagen - Powerful biological performances of collagen - Antioxidant ability - Inhibitory activity - Antitumor activity - Anti-freeze activity - Regulating biological activities - Involving the tissue recovery - EXTRACTION AND PROCESSING OF COLLAGEN : Extraction of collagen - Processing of collagen - COLLAGEN-BASED BIOMEDICAL APPLICATIONS - Drug and gene delivery - Tissue repairing - Smart-healthcare devices DOI : https://doi.org/10.1186/s42825-023-00127-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00127-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40070 [article]

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