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675 : Technologie du cuir et de la fourrure |
Ouvrages de la bibliothèque en indexation 675
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A novel and efficient collagen extraction method assisted by microwave irradiation / Jinwei Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 5 (05/2023)
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Titre : A novel and efficient collagen extraction method assisted by microwave irradiation Type de document : texte imprimé Auteurs : Jinwei Zhang, Auteur ; Yulin Cheng, Auteur ; Jiacheng Wu, Auteur ; Wuyong Chen, Auteur Année de publication : 2023 Article en page(s) : p. 199-207 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Analyse
Cuirs et peaux de bovins
Extraction par micro-ondesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new and efficient microwave heating method was developed to extract intact Type I collagen from bovine limed splits. Orthogonal experiment was conducted to optimize the parameters of extraction, and the extraction yield was measured by ultraviolet spectra (UV). The hierarchical structures of the obtained collagen were determined by amino acid analysis, sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), UV, Fourier transform infrared spectra (FT-IR), circular dichroism spectra (CD), fluorescence spectra (FL) and ultra-sensitive differential scanning calorimetry (US-DSC). The results indicated the optimal conditions for this microwave assisted extraction were 37°C for 7 h by using solid to liquid ratio of 1:45. The resultant yield of collagen was 14.35% under the optimal conditions, which is 1.5 times higher than that obtained by the control water bath-heating method. Amino acid analysis, UV and SDS-PAGE revealed that the primary structure of collagen extracted with microwave assistance was type I collagen. Although the extraction yield was promoted drastically with microwave assisting, the secondary structure of the collagen involving triple helix still maintained according to FT-IR, CD, FL and VP-DSC results. In brief, microwave irradiation could be a new routine for collagen extraction with advantages of fast and effective. Moreover, this study might offer a potential choice for utilizing hide or skin limed split wastes. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Testing methods - Sodium dodecyle sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) - Fourier transform spectroscopy measurement (FT-IR) - Circular dichroism spectroscopy measurement (CD) - Fluorecence spectroscopy measurement (FL) - Ultra-sensitive differential scanning calorimetry (US-DSC)
- RESULTS AND DISCUSSION : Optimization of microwave-assisting collagen extraction - Primary structure of collagen extracted by microwave assisted - Molecular weight of collagen - UV-Vis spectra of collagen - Secondary structure of collagen extracted by microwave assisted - CD spectra of collagen - The intrinsic fluorescence analysis of collagen - The synchronous fluorescence analysis of collagen - Denaturation temperature of collagen
- Table 1 : Orthogonal test results of collagen extraction by microwave irradiation
- Table 2 : Amino acid composition of different kinds of collagen
- Table 3 : Thermal denaturation temperatures of different kinds of collagenDOI : https://doi.org/10.34314/jalca.v118i5.7361 En ligne : https://drive.google.com/file/d/1NerQcNZ1n2lQQya7MdR_RQWXnQk2kzjB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39305
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 5 (05/2023) . - p. 199-207[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23954 - Périodique Bibliothèque principale Documentaires Disponible A novel application of refinery merox unit wastewater for bovine hide unhairing / Asgarifard Pourya in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 8 (08/2020)
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Titre : A novel application of refinery merox unit wastewater for bovine hide unhairing Type de document : texte imprimé Auteurs : Asgarifard Pourya, Auteur ; Tafreshi Navid, Auteur ; Sharifi Akbar, Auteur Année de publication : 2020 Article en page(s) : p. 301-308 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire).
Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia)
Cuirs et peaux de bovins
Eaux usées
Epilage
Epilage -- Aspect de l'environnement
Essais (technologie)
Plan d'expérience
Produits chimiques -- Consommation -- RéductionIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Unhairing is one of the major steps of the leather tanning process which removes the hairs, epidermis and to some degree inter-fibrillary proteins. This process needs high amounts of chemicals that cause environmental difficulties. On the other hand, these chemicals are available in the wastewater of the Merox unit of Kermanshah Refinery. For reducing chemical consumption and decreasing environment pollution, we used the aforementioned wastewater for bovine unhairing. A unhairing liquor was prepared in order to unhair skins and different parameters such as the concentration of CaCO3 and Na2S, process time, and temperature were considered to evaluate their impact on the unhairing process and to obtain optimum condition. Response surface methodology based on Box-Behnken design was applied to model the unhairing efficiency in terms of four independent variables. A second-order polynomial equation was suggested to predict the response with high certainty. ANOVA revealed the validity and importance of that model by P-value of < 0.0001, large F-values, and, R2 of 98.8. The maximum unhairing efficiency of about 98.5 % was obtained under the optimum condition of 1.7 wt% Na2S, 5.8 wt% CaCO3, 114 min process time and 29.5 ºC. Note de contenu : - MATERIALS AND METHODS : Preparation of bovine hides - Preparation of unhairing liquor using wastewater - Test methods - Design of experiments
- RESULTS AND DISCUSSION : Resultsof experimental design - Nonlinear modeling and validation by ANOVA - Response surface analysis - Confirmation testDOI : https://doi.org/10.34314/jalca.v115i8.3844 En ligne : https://drive.google.com/file/d/1qMhGd_8usffwM2W0excPR3qlp6EpRXLh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34437
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 8 (08/2020) . - p. 301-308[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22195 - Périodique Bibliothèque principale Documentaires Disponible A novel approach for enhanced color intensity and uniformity in leather dyeing / Sujata Mandal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)
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Titre : A novel approach for enhanced color intensity and uniformity in leather dyeing Type de document : texte imprimé Auteurs : Sujata Mandal, Auteur ; Jayanthi Durga, Auteur ; G. Jothi, Auteur ; Malathy Jawahar, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2018 Article en page(s) : p. 176-182 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Cuirs et peaux -- Teinture
Photostabilité
Résistance à l'abrasion
Résistance à la transpiration
Résistance aux frottements humides
Solidité de la couleurIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Dyeing is a significant process step in leather making that is carried out to enhance the aesthetics of the tanned hides and skins. Due to the heterogeneous nature of the skin matrix, obtaining leathers with consistent color is challenging. The present study describes application of hydrotalcite-like inorganic synthetic material (HTLM) during leather dyeing to bring color uniformity among leathers by maximizing the color intensity within the skin and among the skins processed in a batch. The HTLM has been used in an interim step between two phases of dyeing that enhanced shade intensity as well as color consistency through modification of the leather surface chemically. The efficacy of the HTLM for enhanced color intensity and uniformity in leather has been investigated. Influence of the HTLM on the physicals characteristics like, perspiration, color fastness to light and dry/wet rub are also studied. Note de contenu : - Materials
- Methods
- Color fastness testing. Fastness to dry and wet rub
- Fastness to light
- Perspiration
- Spectroscopic assessment of color intensity and uniformity
- Characterization of the HTLMEn ligne : https://drive.google.com/file/d/1CDZaPfJCQjnefo3Te9Sro4NC9GcEbmFv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30686
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 6 (06/2018) . - p. 176-182[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19986 - Périodique Bibliothèque principale Documentaires Disponible A novel approach for quantitative characterization of hydrolytic action of glycosidases to glycoconjugates in leather manufacturing / Fengxiang Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 7 (07/2020)
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Titre : A novel approach for quantitative characterization of hydrolytic action of glycosidases to glycoconjugates in leather manufacturing Type de document : texte imprimé Auteurs : Fengxiang Luo, Auteur ; Zhong Xiang, Auteur ; Chunxiao Zhang, Auteur ; Biyu Peng, Auteur ; Zhongzhen Long, Auteur Année de publication : 2020 Article en page(s) : p. 263-269 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Epilage enzymatique
Essais (technologie)
Glycoprotéines
GlycosidasesLes Glycoside hydrolases (ou glycosidases) catalysent l'hydrolyse de liaisons glycosidiques et libèrent au moins un composé osidique. Ce sont des enzymes extrêmement communes, dont les rôles sont aussi divers que la dégradation des glucides complexes (cellulose et hémicellulose), les défenses anti-bactériennes (ex. le lysozyme), la pathogénicité (ex. les neuraminidases virales) ou le métabolisme cellulaire (amylases ou enzyme de débranchement du glycogène pour le métabolisme énergétique, mannosidases comme modulateur de glycosylation des protéines, ...). Les glycosyltransférases et les glycosides hydrolases sont les deux classes majeures d'enzymes impliquées dans la synthèse et la rupture des liaisons osidiques.
Hydrolyse enzymatique
Peaux brutes -- Trempe
Poudre de peauxIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Glycoconjugates, herein glyco-protein conjugates, composed of protein and saccharide chains are the main components of the interfibrillar matrix in skin which need to be fully removed in the leather making process. The application of glycosidases can assist unhairing and skin fiber opening-up, resulting in the improvement of leather quality, by breaking the glycoconjugates safely and efficiently in mild conditions. The biotechnology assisted by glycosidases, a big family of over 200 kinds of enzymes, has a great potential but the related mechanisms and the efficiency of different glycosidases are still not clear, which interferes with its wide application. To screen the proper glycosidases, a novel method of evaluating the catalytic hydrolysis properties of glycosidases towards skin glycoconjugates based a special hide powder substrate, simulating the actual leather processing, was established through detecting the produced amount of the total sugar in the solution. The special substrate was prepared, the determination conditions were optimized, then the performances of several typical glycosidases were evaluated and their application effects in soaking process of leather making were also investigated. The results show that the optimum testing conditions are lower than 4 h of the reacting time, optimally 2 h, and lower than 40 U/mL of the enzyme concentration, optimally 0-25 U/mL based on 2 g of the substrate; the results to evaluate the properties of some glycosidases based on the established method are positively related to their applying effects in soaking. The new method with better repeatability can be used as an available tool to correctly select glycosidases and optimize process parameters for correct use. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the hide powder substrate containing glycoconjugates - Assay of glycosidase activity based on the prepared substrate - Optimization of parameters of the testing method - Glycosidase soaking trial
- RESULTS AND DISCUSSION : Parameters of the prepared hide powder substrate - Optimization of the testing conditions in detecting glycosidase activity - Evaluation of properties of typical glycosidases - Relationship between glycosidases activities to glycoconjugates and soaking effectDOI : https://doi.org/10.34314/jalca.v115i7.3836 En ligne : https://drive.google.com/file/d/1kbuXsp8wOESPhNaKvy8ct9TgkMOnJu9y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34328
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Code-barres Cote Support Localisation Section Disponibilité 21879 - Périodique Bibliothèque principale Documentaires Disponible Novel approach for the removal of organic contaminants in wastewaters : adsolubilization of 2-naphthol onto collagen fibres / Fernando Maldonado in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 3 (05-06/2013)
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Titre : Novel approach for the removal of organic contaminants in wastewaters : adsolubilization of 2-naphthol onto collagen fibres Type de document : texte imprimé Auteurs : Fernando Maldonado, Auteur ; Albert M. Manich, Auteur ; Agusti Marsal, Auteur Année de publication : 2013 Article en page(s) : p. 105-110 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cinétique chimique
Collagène -- Solubilité
Dodécyl sulfate de sodiumLe laurylsulfate de sodium (LSS) ou dodécylsulfate de sodium (SDS) est un détergent et tensioactif ionique fort, couramment utilisé en biochimie et biologie moléculaire.
C'est un composé à ne pas confondre avec le laureth sulfate de sodium.
La concentration micellaire critique du SDS varie de 0,007 à 0,01 mol/L dans l'eau à 25°C.
Le dodécylsulfate de sodium (en anglais, Sodium Dodecyl Sulfate ou SDS ou/ NaDS), de formule C12H25NaO4S, aussi connu sous le nom de laurylsulfate de sodium (en anglais, sodium lauryl sulfate ou SLS), est un tensioactif ionique qui est utilisé dans les produits ménagers tels que les dentifrices, shampooings, mousses à raser ou encore bains moussants pour ses effets épaississants et sa capacité à créer une mousse, il est également repris comme additif alimentaire par le codex alimentarius (E487).
La molécule est composée d’une chaîne de 12 atomes de carbone, rattachée à un groupement sulfate conférant à la molécule les propriétés amphiphiles requises pour un détergent. Le SDS est préparé par sulfonation du dodécanol (alcool de lauryl, C12H25OH), suivie par une neutralisation par du carbonate de sodium. Le SDS est utilisé aussi bien dans les procédés industriels que pour les produits cosmétiques destinés au grand public.
Eaux usées -- Décontamination
Electrolytes
Isotherme d'adsorption
Naphtols
pH
Polluants organiques
ThermodynamiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Research on adsolubilization to fibrous proteins, such as collagen, has received little attention despite its academic relevance and potential industrial applications.
The aim of this work was to study the influence of different parameters on adsolubilization onto collagen fibres using 2-naphthol as a model substance in order to verify the feasibility of this process in removing organic contaminants from wastewaters. The collagen fibres were previously or simultaneously treated with an anionic surfactant under mild acidic aqueous conditions to form the admicelles.
The following parameters were considered: shaking time, surfactant type (sodium dodecyl sulphate and sodium dodecylbenzene sulphonate); influence of pH; presence of electrolytes and polarity of the medium. Adsolubilization isotherms were obtained at 10, 20, 25, 30 and 35°C and the kinetic study of adsolubilization was also measured. Thermodynamic parameters such as enthalpy change, entropy change and free energy change were calculated by applying the van't Hoff equation for adsolubilization of 2-naphthol.
The higher adsolubilization capacity of 2-naphthol was reached at acidic pH and equilibrium was achieved after two hours of treatment. The presence of ethanol in the batch considerably lowered the adsolubilization capacity of fibrous collagen. Thermodynamic parameters indicated that the adsolubilization process is exothermic and spontaneous. The kinetic study revealed that adsolubilization of 2-naphthol onto collagen fibres is best described by a pseudo-second order model.
Our results open the door to the use of collagen fibres in the separation of organic contaminants from wastewaters through adsolubilization.Note de contenu : - AIM OF THE WORK
- EXPERIMENTAL PROCEDURES : Materials - Methods
- RESULTS AND DISCUSSION : Effect of shaking time - Effect of pH - Influence of the ionic strength - Influence of the polarity of the medium - Influence of the initial amount of SDS - Adsorption and adsolubilization isotherms - Influence of temperature. Thermodynamic parameters - Adsolubilization kinetics of 2-naphthol onto SDS-hpEn ligne : https://drive.google.com/file/d/1wUnnBflsaPkBGGOfprh42JyIx4Ky9koX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18838
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Code-barres Cote Support Localisation Section Disponibilité 15193 - Périodique Bibliothèque principale Documentaires Disponible A novel approach of removing externally attached debris from animal carcass to ensure meat safety and byproduct quality / Majher I. Sarker in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)
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PermalinkA novel approach to the assessment of the level dyeing characteristics of acid dyes / R. H. Ricketts in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)
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PermalinkA novel approach towards preservation of skins / K. C. Kannan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 11 (11/2010)
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PermalinkNovel approaches to the generation of data bases for computer-match prediction in leather dyeing / W. R. Dyson in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 1 (01/1991)
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PermalinkNovel eco-friendly approaches for the production of uphosltery leather / Samir Das Gupta in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 3 (03/2009)
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PermalinkA novel pickle-free high exhaust chrome tanning method-an appproach for tota dissolved solids management / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)
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PermalinkA novel polymeric additive and its potential for use in retanning applications / Geoffrey J. Ward in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
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PermalinkNovel procedure for large-scale purification of atelocollagen by selective precipitation / S. S. Maier in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 1 (01/2010)
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PermalinkA novel process for making patent leather / F. Scholnick in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
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PermalinkNovel retanning agents for chrome tanned leather based on emulsion - Nano particles of styrene/butyl acrylate co-polymers / E. H. A. Nashy in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 9 (09/2011)
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PermalinkA novel study on using pufferfish skin as sustainable leather : characterisation, thermal behaviour and sound absorption properties / Muhammet Uzun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 4 (07-08/2022)
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PermalinkA novel synthesized melamine compound for leather making / Wang Yu-Zeng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)
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PermalinkA novel system of removing décorin, a minor proteoglycan of bovine hides, to improve the quality of leather / Mila Aldema-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 7 (07/2010)
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PermalinkA novel technique for getting leather section image based on metallographic sample preparation / Huayong Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 5 (05/2013)
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PermalinkNovel water-based urethanes in leather finishing / Jon W. Bouchard in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)
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PermalinkA novel water dispersable bentonite - acrylic graft copolymer as filler cum retanning agent / Y. Lakshminarayana in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 1 (01/2002)
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PermalinkA novel way to improve the hydrothermal stability of chrome tanned leather / Samir Das Gupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 4 (07-08/1979)
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PermalinkNubuck finishing with water-based carbonyl-functional polymers / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)
PermalinkNutrient balance in aerobic biological treatment of tannery wastewater / Jianfei Zhou in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 5 (05/2014)
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