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Enzymatic bacterial dehairing of bovine hide by a locally isolated strain of bacillus Licheniformis / E. H. A. Nashy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 6 (11-12/2005)
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Titre : Enzymatic bacterial dehairing of bovine hide by a locally isolated strain of bacillus Licheniformis Type de document : texte imprimé Auteurs : E. H. A. Nashy, Auteur ; S. A. Ismail, Auteur ; A. M. Ahmady, Auteur ; H. El-Fadaly, Auteur ; N. H. El-Sayed, Auteur Année de publication : 2005 Article en page(s) : p. 242-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bacillus licheniformis
Bactéries -- Identification
Caractérisation
Cuirs et peaux de bovins
Epilage enzymatiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bacterial isolation and identification were realized for microbial enzymatic dehairing of animal skin. The process was optimized for the required skin quality taking into account the contact time, temperature, pH, crude enzyme concentration (%) as well as mechanical agitation. Scanning electron microscopy (SEM) was used to show the effect of bacterial enzyme on the grain surface and fibres in comparison with the chemical unhairing considering the quality of the skin.
The optimization of keratinase activity was also examined. The bacterial isolates were identified as Bacillus licheniformis, (coded as D-10). The experimental results showed that the contact time of 48hr at 35°C, pH8.7, crude enzymatic concentration (v/v) 6% and shaking at 100 rev. min-1 are optimal for enzymatic dehairing of animal hide. The results obtained and the SEM results indicate the possibility of using bacterial enzymes to dehair animal skin instead of using chemical compounds, to assure good skin quality, protecting the environment and saving time.Note de contenu : - MATERIALS AND METHODS : Growth Conditions - Isolation and Identification of Proteolytic Bacteria - Preparation of standard inoculum and enzyme production - Enzyme Assay - Enzymatic dehairing by selected Bacillus licheniformis - Dehairing of skin by Na2S/Lime
- RESULTS AND DISCUSSION : Screening and Selection of the most potent isolate for animal skin dehairing - Identification of the selected potent isolate
- CONCLUSION : Bacterial enzyme/sulphide comparison - Characterization of the enzymatic reaction conditions
- Table 1 : Shape and proteolytic potency of the bacterial isolates at 37°C for 48 hours and their effect on animal skin
- Table 2 : Morphological and biochemical characteristics of bacterial isolate active in animal skin dehairing
- Table 3 : Factors affecting on animal skin dehairing by enzymeEn ligne : https://drive.google.com/file/d/1DHdolEkyxA7dBoVPYRDyLUKv1yvT860f/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39214
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 6 (11-12/2005) . - p. 242-249[article]Enzymatic membrane reactor for eco-friendly goat skin unhairing / A. Cassano in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 5 (09-10/2000)
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Titre : Enzymatic membrane reactor for eco-friendly goat skin unhairing Type de document : texte imprimé Auteurs : A. Cassano, Auteur ; E. Drioli, Auteur ; R. Molinari, Auteur ; D. Grimaldi, Auteur ; F. La Cara, Auteur ; M. Rossi, Auteur Année de publication : 2000 Article en page(s) : p. 205-211 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Cuirs et peaux de chèvres
Déchets -- Réduction
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.
Epilage enzymatique
Essais (technologie)
Filtration
Produits chimiques -- Consommation -- Réduction
Récupération (Déchets, etc.)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new approach is proposed in order to solve current problems in the dehairing process. An enzymatic agent was used as an alternative to conventional chemical dehairing methods. Ultrafiltration of the enzymatic dehairing bath was carried out during the unhairing operation thus creating an enzymatic membrane reactor for the production of dehaired skins.
The operating system, analytical measurements and microscopical observations on the treated skins in comparison with the control group (lime-sulphide process) are reported and discussed.
The results obtained show the possibility to reduce the environmental impact caused mainly by the aqueous stream coming from conventional dehairing. Other advantages obtained using the coupled enzymatic/UF system were: control of enzyme action; reduction of sulphide requirement: easy recovery of hair with consequent reduction of polluting load and of cleaning-up costs; the possibility of reusing the recovered hair ; simplification of wastewater cleaning-up processes : increased opening-up of the fibre structure and production of softer leather; plus the possibility of avoiding the bating operation, thus obtaining savings in terms of time, work, water and chemicals.Note de contenu : - MATERIALS AND METHODS : Proteolytic enzyme - Unhairing tests - Unhairing tests in the enzyme membrane reactor
- RESULTS AND DISCUSSION : Enzyme activity characterisation - Experimental unhairing tests - Unhairing tests in the EMR - Enzyme/sulphide comparison
- Table 1 : Recipe used for enzymatic unhairing coupled with ultrafiltration (initial weight of dry skins kg 12.5)
- Table 2 : Analyses of fat substances on soaked and dehaired skins
- Table 3 : Physical testing on leather samples unhaired with the conventional method (lime and sodium suiphide) and with the enzymatic method (experimental group)
- Table 4 : Chemical testing on leather samples unhaired with the conventional method (lime and sodium suiphide) and with the enzymatic method (experimental group)En ligne : https://drive.google.com/file/d/1M8cX_NobVvN45WfAJOyhiK0eZtrSurX7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40918
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 5 (09-10/2000) . - p. 205-211[article]Enzymatic synthesis of sodium alginate-g-poly (acrylic acid) grafting copolymers as a novel printing thickener / Nan Zhang in COLORATION TECHNOLOGY, Vol. 138, N° 3 (06/2022)
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Titre : Enzymatic synthesis of sodium alginate-g-poly (acrylic acid) grafting copolymers as a novel printing thickener Type de document : texte imprimé Auteurs : Nan Zhang, Auteur ; Zhensheng Tian, Auteur ; Yuanyuan Yu, Auteur ; Ping Wang, Auteur ; Man Zhou, Auteur ; Qiang Wang, Auteur Année de publication : 2022 Article en page(s) : p. 278-290 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique
Alginate de sodiumL'alginate de sodium ou polymannuronate sodique, de formule NaC6H7O6 est un additif alimentaire (E401) utilisé dans les boissons, constitué d’alginate et de sodium. Il se présente sous forme de poudre blanche à blanc crème, inodore et sans saveur, très soluble dans l'eau. C'est une longue molécule extraite d'algues brunes, constituée d'unités de glucides reliées ensemble pour former une chaîne.
Caractérisation
Catalyse enzymatique
Composés organiques -- Synthèse
Copolymères greffés
Epaississants
Greffage (chimie)
Impression sur étoffes
Péroxydase de raifortLa peroxydase de raifort (HRP, en anglais horseradish peroxidase) est une enzyme provenant comme son nom l'indique du raifort, très utilisée en biochimie de par son action catalytique des réactions de réduction. Elle est plus particulièrement utilisée lors de protocoles de détection de molécules lors d'immunohistochimie ou d'immuno-blot (western blot), ainsi que pour son action catalytique lors des réactions d’oxydo-réductions.
HPR catalyse des réactions de la forme AH2 +H2O2 → A+2H2O, où AH2 joue le rôle de réducteur et H2O2 d’oxydant. (NaBO3 peut être utilisé à la place de H2O2).
Son poids moléculaire est de 30 kDa.
Peroxyde d'hydrogèneLe peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales.
Rhéologie
Stabilité thermiqueIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Grafting modification is a common method for improving the specific properties of polysaccharides. Herein, we synthesised sodium alginate-g-poly (acrylic acid) (NaAlg-g-PAA) as a novel printing thickener via catalysis of horseradish peroxidase and hydrogen peroxide in the presence of acetylacetone. The synthesised products were characterised by Fourier Transform–infrared spectroscopy and polar nuclear magnetic resonance spectroscopy, which confirmed that the PAA was successfully grafted onto the hydroxyl groups at carbon atoms (C2) of sodium alginate. The optimal grafting percentage and grafting efficiency reached 51% and 96%, respectively. Compared with native sodium alginate, the grafted copolymer NaAlg-g-PAA exhibited better thermal stability, rheological and printing properties. This work provides an efficient and promising approach for modifying polysaccharides like alginates and could be used as an alternative to conventional chemical modification. Note de contenu : - EXPERIMENTAL : Materials - Characterisations
- RESULTS AND DISCUSSION : Chemical structural characterisation of grafted sodium alginate - Optimisation of grafting copolymerisation conditions - Rheological analysis - Properties of stock paste and printing performance
- Table 1 : Average molecular weights of sodium alginate (NaAlg), sodium alginase-g-poly(acrylic acid) (Na-Alg-g-PAA) and NaAlg treated with HRP and H2O2
- Table 2 : Parameters for the power law and Herschel-Bulkely model
- Table 3 : Critical frequency values of sodium alginate (NaAlg) and graft copolymers with different grafting percentages (GPs)
- Table 4 : The colour fasntess of the fabrics printed with sodium alginate (NaAlg) and sodium alginate-g-poly(acrylic acid) (NaAlg-g-PAA) thickenersDOI : https://doi.org/10.1111/cote.12595 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12595 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37857
in COLORATION TECHNOLOGY > Vol. 138, N° 3 (06/2022) . - p. 278-290[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23519 - Périodique Bibliothèque principale Documentaires Disponible EPDM-G-GMA toughening of straw/polypropylene composites : mechanical properties, thermal stability and rheological properties / Y. He in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)
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Titre : EPDM-G-GMA toughening of straw/polypropylene composites : mechanical properties, thermal stability and rheological properties Type de document : texte imprimé Auteurs : Y. He, Auteur ; H.-M. Wu, Auteur ; J.-B. Guo, Auteur ; W.-D. He, Auteur ; Y. Zhou, Auteur Année de publication : 2020 Article en page(s) : p. 50-57 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Analyse thermique
Caractérisation
Composites à fibres végétales -- Propriétés mécaniques
Composites à fibres végétales -- Propriétés thermiques
Ethylène-propylène-diène monomère
Paille
Polypropylène
Rhéologie
Stabilité thermiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : Natural fiber reinforced polymer composites have the advantages of low density, low cost and renewability. However, the inferior mechanical property restricts the application. In this work, EPDM-g-GMA has been added to straw/PP composites to improve the properties. The mechanical properties, thermal stability, crystallinity and melt viscosity have been invested. The results reveal that the mechanical properties of straw/PP/EPDM composites are improved remarkably and the impact strength more than doubles compared to straw/PP composites. Surface microstructure analysis reveals that the composite has good interfacial compatibility and dispersing performance. The maximum decomposition temperature, the melting enthalpy and crystallinity increased. The glass transition temperature and process ability are also improved by the addition of EPDM. Note de contenu : - EXPERIMENTAL : Materials and equipment - Composite preparation - Characterization
- RESULTS AND DISCUSSION : Mechanical properties - Morphology - Thermal stability - DSC analysis - DMA analysis - Rheological propertiesDOI : https://doi.org/10.3139/217.3836 En ligne : https://drive.google.com/file/d/1EMazIVfzrlz6IUYkZoQSVSzJL9eijUmu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33778
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 1 (03/2020) . - p. 50-57[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21578 - Périodique Bibliothèque principale Documentaires Disponible Epoxidized methyl ricinoleate bio-plasticizer with a pendant acetate ester for PVC artificial material : circumventing existing limit on achievable migration resistance / Siyu Pan in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)
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Titre : Epoxidized methyl ricinoleate bio-plasticizer with a pendant acetate ester for PVC artificial material : circumventing existing limit on achievable migration resistance Type de document : texte imprimé Auteurs : Siyu Pan, Auteur ; Delong Hou, Auteur ; Haojun Fan, Auteur Année de publication : 2019 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides gras
Caractérisation
Chlorure de polyvinyle
Composés organiques -- Synthèse
Epoxydation
Esters méthyliques
Huile de ricin et constituants
Phtalates -- Suppression ou remplacement
PlastifiantsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Processing polyvinyl chloride (PVC) artificial material requires plasticizer that softens the PVC coating. Currently, utilizing unsaturated fatty acid methyl esters to obtain epoxidized fatty acid methyl ester (EFAME) bio-plasticizers constitutes an environmentally responsible solution to substitute conventional ortho-phthalates that are endocrine disruptors or probable carcinogens. However, commercial EFAMEs, even with the highest epoxy value (ca. 5.5–5.8%) so far, still suffer from fast leaching from the PVC matrix, burdening the environment and shortening lifespan of the artificial material. Here, we report a proof-of-principle demonstration of a new strategy to obtain migration-resistant EFAME that harnesses the midchain hydroxyl of methyl ricinoleate and covalently attachment of a pendant acetate ester. Despite a low epoxy value (3.0%), the engineered bio-plasticizer displays significantly suppressed migration in multiple scenarios compared with one conventional EFAME with much higher epoxy value (5.8%). Circumventing the limit confronting previous strategy that highlights the sole contribution of epoxy value to achievable migration resistance, the rationale herein may provide guidance for designing new EFAMEs with comparable performance to ortho-phthalates, thus bringing the old and oft-maligned PVC artificial material industry one step closer to sustainability. Note de contenu : - Materials
-Synthesis of epoxidized methyl ricinoleate with a pendant acetate ester (EMRA)
- Preparation of plasticized PVC membranes
- Characterization
- Simulation details
- Table 1 : Physicochemical parameters of EMRA and corresponding intermediates
- Table 2 : Composition of MR, MRA, and EMRA identified by comparing the experimental mass spectra of the components in Fig. 3 against NIST08 mass spectral libraryDOI : https://doi.org/10.1186/s42825-019-0006-8 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0006-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36947
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 1 (Année 2019) . - 10 p.[article]Epoxy-based multilayered coating containing carbon nanotube (CNT), silicon carbide (SiC), and carbonyl iron (CI) particles: as efficient microwave absorbing materials / Firouz Ghanbari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)
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PermalinkEpoxy functionalization of multiwalled carbon nanotubes for their waterborne polyurethane composite with crosslinked structure / Shaohui Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
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PermalinkEpoxy silica resin for highly-stressed composite springs, high-pressure vessels and cryogenic rockets / Max Sardou in JEC COMPOSITES MAGAZINE, N° 134 (05-06/2020)
PermalinkPermalinkEthiopian Ankelba : an attempt to modernize the cultural leather artifact / Elena Teka Genet in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 12 (12/2020)
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PermalinkEthylene glycol diglycidyl ether applied to crosslinking dyeing of cotton fabric with madder dye / Xiaoyu Cai in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)
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PermalinkEtude du comportement de la protection foudre face à un impact mécanique / Jeremy Crevel in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 24, N° 2 (04-05-06/2014)
PermalinkEtude des mécanismes d’endommagement des composites fibres de carbone / matrice polyamide : application à la r éalisation de réservoirs de stockage de gaz sous haute pression de type IV / Cédric Thomas / 2011
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PermalinkEtude de la polycondensation entre une résine diépoxyde et une diamine aromatique avant le point de gel / Thi Hoang Lan Nguyen / 1982
PermalinkÉtude des propriétés physico-chimiques, thermiques et mécaniques des fibres d’alfa / Dalila Hammiche in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 25, N° 1 (01-02-03/2015)
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