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Antimicrobial leather : preparation, characterization and application / Wang Zhiyuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)
[article]
Titre : Antimicrobial leather : preparation, characterization and application Type de document : texte imprimé Auteurs : Wang Zhiyuan, Auteur ; Haibin Gu, Auteur ; Wuyong Chen, Auteur Année de publication : 2013 Article en page(s) : p. 154-165 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Caractérisation
Encapsulation
Huile de clou de girofle
PolyuréthanesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In order to produce a new kind of functional antimicrobial leather, that has the lasting ability to kill or inhibit microorganisms, we investigated the preparation and properties of PU-microencapsulated clove oil (PU-MCO). Firstly, the microcapsules were prepared by interfacial polymerization using polyurethane (PU) as the wall material. Results of optimization experiments show that when the ratios of shell-core, PEG-TDI and 0/W phase are 1:3 (w/w), 1:3 (mol ratio) and 15:85(w/w), respectively, the PU-MCO emulsion obtained is very stable and the encapsulation rate of clove oil can reach 94.3%. Laser particle, zeta potential analyzer, SEM, FT-IR, TG and GC-MS were used to characterize its size, shape, structure, components and stability. Results indicate that the microcapsule particles assume the spherical shape with average size of 0.2-1.0unn, and the main content of clove oil is not significantly affected by the microencapsulation. However, its heat stability has greatly improved and the starting decomposition temperature can be improved to 110°C or so. Meanwhile, the microencapsulated clove oil shows a good controlled-release property.
Results of antimicrobial tests reveal that, although the minimum inhibitory concentrations (MICs) of the microcapsule product are higher than that of crude clove oil, it still has sufficient antimicrobial activity against bacteria, yeasts and moulds.
Finally, the PU-MCO was applied in retanning goat garment leather. The leather shows good antimicrobial property which persists for a long time at room temperature and is not significantly affected by perspiration or washing because of the firm physical and chemical combination between the PU wall material and leather fibres. Thus, using the microencapsulated natural clove oil, we successfully provided a feasible method to prepare an antimicrobial leather with a non-toxic nature and long-term effectiveness.Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of PU-microencapsulated clove oil - Characterization of PU-microencapsulated clove oil (Particle size - Optical microscope - Scanning electron microscope (SEM) - Gas chromatography-mass spectrometry (GC-MS) - Encapsulation rate - FT-IR - Thermal analysis - Release property - Antimicrobial activity) - Application of PU-MCL to wet-blue (Shrinkage temperature (Ts) - Antimicrobial activity of crust leathers - Controlled-release test - Water-washing test - Perspiration test)
- RESULTS AND DISCUSSION : Optimization of preparation conditions of PU-MCO (Particle size - Diversity and shape - GC-MS - FT-IR - TG and DSC - Release property - Antimicrobial activity) - Properties of antimicrobial leathers produced by PU-MCO (Antimicrobial property - Durability of antimicrobial property)En ligne : https://drive.google.com/file/d/1jgZWx7SPuuAdcuvh4qjmtgEaJ-E_mA7y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19220
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 154-165[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15393 - Périodique Bibliothèque principale Documentaires Disponible Automated clean leather dyeing assisted by wringing, ultrasound and microwave / Ying Gong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)
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Titre : Automated clean leather dyeing assisted by wringing, ultrasound and microwave Type de document : texte imprimé Auteurs : Ying Gong, Auteur ; Kang Cheng, Auteur ; Tao Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2011 Article en page(s) : p. 127-132 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Teinture
Diffractométrie de rayons X
Micro-ondes
Microscopie électronique à balayage
UltrasonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A “clean” leather dyeing was designed with wringing (8-10 kg/cm2), ultrasound (28 kHz, 2.4 W/cm2) and microwave (2450 MHz, 10 W/L). Twenty leathers samples were successively colored with this method in a laboratory scale trial. The dye exhaustion (%), the color values and the color rub fastnesses were determined. Also, the grain surface and the cross-section of the leathers were analyzed before and after dyeing. As presented, it only required 5 minutes to color with this method and the dye exhaustions averaged 2.3%, helpful for the recycling of the dye solution. The color for the test group of ten leathers varied within a small range ( ?E <1) when the solution was directly recycled without dye replenishment. The color fastnesses reached as much as the 4-5 dry rub scale and 3 wet rub scale after the leathers were coated with a typical shoe upper finishing formula. Furthermore, the grain and the collagen fibers were not significantly damaged during the dyeing process as demonstrated by Scanning Electron Microscope and X-ray diffraction analysis. In summary, this clean and quick dyeing could be considered a potential option for leather dyeing. Note de contenu : - EXPERIMENTAL : Materials - experimental set-up - Leather dyeing - Analysis methods : analysis of dye exhaustion - determination of color difference : Determination of fastness to wet and dry rub - scanning electron microscopc study (SEM) - X-ray diffraction study (XRD)
- RESULTS AND DISCUSSION : Dye exhaustion - color measurements and fastnesses - SEM analysis - XRD analysis.En ligne : https://drive.google.com/file/d/1CQ_v-nJ9ZzVIL7AXa72ZpxuKiLDcpZRP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11315
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Code-barres Cote Support Localisation Section Disponibilité 013045 - Périodique Bibliothèque principale Documentaires Disponible Behavior of fatliquored leathers in a microwave field / Ying Gong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 2 (02/2012)
[article]
Titre : Behavior of fatliquored leathers in a microwave field Type de document : texte imprimé Auteurs : Ying Gong, Auteur ; Tao Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2012 Article en page(s) : p. 60-67 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Collagène
Cuir
Huiles et graisses de poissons
Micro-ondes
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leathers fatliquored with sulfited fish oil were irradiated with microwave at various intensities, then their physical properties and the microstructure of collagen fibers were investigated to show the roles of microwave field. As confirmed, the free and capillary moisture in leather were firstly removed by microwave radiation, accompanying with diminution in area. However, the hydrothermal stability of leather was scarcely altered. Scanning Electron Microscope images indicated that the dispersion of collagen fibers was not destroyed with microwave exposure. In addition, the characteristic D-periodicity and microstructure for the collagen were changed little as revealed by Atomic Force Microscope and X-ray Diffraction studies. Furthermore, there was some improvement in the softness of leathers because of migration of oil and its uniform distribution. These results could be helpful for understanding the roles of microwave technique in leather industry. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Microwave irradiation trials - Analyses of physical properties of leathers (measurement of temperature on leather grain - determination of face area yield (%) - Measurement of moisture content (%) - Determination of shrinkage temperature) - Measurement of softness - Characterization of collagen fibers in leathers (scanning electron microscope study - Atomic force microscope study - X-ray diffractometer study) - Characterization of fatliquors (dielectric constant study - viscosity study - determination of particle size in fatliquor solution)
- RESULTS AND DISCUSSION : Physical properties - SEM analyses - AFM analyses - XRD analyses - Properties of fatliquorsEn ligne : https://drive.google.com/file/d/1JStobg1o40hlW2K1GoFzGut0BrHNqtWj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13571
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Code-barres Cote Support Localisation Section Disponibilité 13693 - Périodique Bibliothèque principale Documentaires Disponible 13824 - Périodique Bibliothèque principale Documentaires Disponible Composition, structure and properties of immunized hair from hair-saving unhairing process / Kong Lili in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)
[article]
Titre : Composition, structure and properties of immunized hair from hair-saving unhairing process Type de document : texte imprimé Auteurs : Kong Lili, Auteur ; Jinwei Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2015 Article en page(s) : p. 124-128 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Cuirs et peaux de bovins
Epilage enzymatique
Essais (technologie)
Immunisation (épilage)
Résistance chimiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The immunized cattle hair from a hair-saving unhairing process was observed by Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM), and the elements in the cortex were analyzed by Energy Dispersive X-ray Spectroscopy (EDS), while the original hair was used as control. The différences of resistance to acid, alkali, oxidant and enzyme between immunized hair and original hair were also compared. The results showed that the thickness of the immunized hair squame decreased by approximately 30.01%, and the surface morphology was obviously damaged compared with the original hair. Calcium and magnésium were found in the immunized hair, while the content of sulfur decreased slightly ; the antioxidant properly of the immunized hair was improved greatly, but the acid resistance, alkali resistance and enzyme resistance were reduced significantly. In general, the composition, structure and properties of the immunized hair showed great changes after hair-saving unhairing process, these changes form the basis for the utilization of the immunized hair. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - Structure and composition test - Chemical resistance test - Enzyme resistance test
- RESULTS AND DISCUSSION : Squama analysis - Elemental analysis - Property of enzyme resistanceEn ligne : https://drive.google.com/file/d/1mWpEt6etsB2aA52ZY8bli2nvwB9el-fx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24256
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Code-barres Cote Support Localisation Section Disponibilité 17271 - Périodique Bibliothèque principale Documentaires Disponible Control of microorganisms on tanned leather : from fungicide to antimicrobial function leather / Haibin Gu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 2 (02/2016)
[article]
Titre : Control of microorganisms on tanned leather : from fungicide to antimicrobial function leather Type de document : texte imprimé Auteurs : Haibin Gu, Auteur ; Li Zhao, Auteur ; Jun Ma, Auteur ; Yingjie Yang, Auteur ; Changqing Zhao, Auteur ; Wuyong Chen, Auteur Année de publication : 2016 Article en page(s) : p. 69-87 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques
Antimicrobiens
Argent
ChitosaneLe chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà, chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à-dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes.
Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique.
Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine.
Cuirs et peaux -- Conservation
Dioxyde de silicium
Dioxyde de titane
Huiles essentielles
Nanoparticules
Oxyde de zinc
Polymères
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : To inhibit the microbial growth on tanned leathers including wetblue, crust leathers, finished leathers and their goods (shoes, garments, bags, etc.), fungicides are usually applied during various leather-making processes. Under the situation of increasingly strict environmental legislation, all kinds of ecofriendly fungicides were explored recently to replace the currently used noxious ones in leather industry. Meanwhile, a nontraditional new type of leather, called antimicrobial function leather, attracted more and more attention from leather chemists and technologists, because of its tempting antimicrobial protection provided and wide application prospects in many fields such as medical materials, health products, daily products, public transport vehicles, and so on. Based on the literatures published in the past decade, especially in the past five years, this review systematically and comprehensively summarizes current status and development trend about leather fungicides and antimicrobial function leather. The discussed antimicrobials contain traditional organic synthetic fungicides with small molecular weight, natural essential oils, macromolecular polymers and chitosan derivatives, and nano-inorganic antimicrobials (nanosilver, nano-ZnO, nano-TiO2, nano-SiO2, etc.). Finally, several proposals are addressed for the development of new leather fungicides and antimicrobial function leather, and especially, a new viewpoint, in which the antimicrobial leather is prepared based on various tanning mechanisms, is demonstrably presented to solve the problem of loose combination between antimicrobial substances and leather fibers. Note de contenu : - SYNTHETIC ORGANIC MICROMOLECULAR ANTIMICROBIALS
- NATURAL ESSENTIAL OILS :
- MACROMOLECULAR ANTIMICROBIALS : Antimicrobial polymers - Chitosan derivatives
- NANO-INORGANIC ANTIMICROBIALS : Nanosilver - Nano-ZnO - Nano-TiO2 - Nano-SiO2 - Nano-Copper
- TABLE : Essential oils studied in leather industryEn ligne : https://drive.google.com/file/d/1fkvFTnvzo8svNSC10e8R7d9v-WSDMLSi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25428
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