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675 : Technologie du cuir et de la fourrure |
Ouvrages de la bibliothèque en indexation 675
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Diffusion and reaction behavior of proteases in cattle hide matrix via FITC labeled proteases / Jianzhong Ma in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 5 (05/2014)
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Titre : Diffusion and reaction behavior of proteases in cattle hide matrix via FITC labeled proteases Type de document : texte imprimé Auteurs : Jianzhong Ma, Auteur ; Xueyan Hou, Auteur ; Dangge Gao, Auteur ; Jing Zhang, Auteur Année de publication : 2014 Article en page(s) : p. 138-145 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Détérioration
Cuirs et peaux de bovins
Diffusion (physique)
Hydrolyse enzymatique
Isothiocyanate de fluorescéineL'isothiocyanate de fluorescéine (FITC, fluorescein isothiocyanate en anglais) est un dérivé de la fluorescéine utilisée dans un large spectre d'applications comme la cytométrie en flux. Le FITC est une molécule de fluorescéine fonctionnalisée avec un groupe réactif isothiocyanate (-N=C=S), remplaçant un atome d'hydrogène sur le cycle le plus bas de la structure. Ce dérivé réagit avec les nucléophiles comme les groupes amines et sulfhydryles des protéines.
Un groupe fonctionnel succinimidyle-ester greffé au noyau fluorescéine, créant le NHS-fluorescéine, forme un autre dérivé commun réagissant avec les amines, possédant une plus grande spécificité envers les amines primaires en présence d'autres nucléophiles.
Le FITC possède un pic d'excitation et d'émission à 495 nm et 521 nm respectivement. Comme la plupart des fluorochromes, il est sujet au photobleaching. Par conséquent, des dérivés de la fluorescéine tels que l'Alexa 488 et le DyLight 488 ont été optimisés pour des applications chimiques et biologiques nécessitant une plus grande photostabilité, une plus grande intensité de fluorescence ou l'ajout de groupements différents.
PeptidasesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Enzymes play an important role in the biological treatment of animal skin collagen in the leather making process. In this work, three proteases (2709, LimeG and SoakL) with different molecular weight were used in the treatment of cattle hide. Protein and hydroxyproline absorbance was measured to evaluate the treatment effectively. Proteases labeled by Fluorescein Isothiocyanate (FITC) were used to treat the cattle hide to observe the diffusion and reaction behavior of proteases in cattle hide matrix. The results indicate that when the cattle hide was treated with smaller molecular weight protease, the degradation degree of the protein and collagen was more than that of the cattle hide treated with larger molecular weight protease. The fluorescence microscopy images demonstrate that during the early stages, proteases chiefly diffused into the cattle hide matrix through pores and hair follicles, and then diffused into the inner layer via hair follicles to hydrolyze inter-fibrillary proteins for opening up collagen fibers. In the present investigation, a visible assessment for the diffusion and reaction behavior of proteases in the enzymatic treatment of cattle hide matrix was reported. Note de contenu : - MATERIALS AND METHODS : Materials - Instrumentation - Determination of the protease activity - Enzymatic treatment of cattle hide matrix - FITC labeled protease - Analysis
- RESULTS AND DISCUSSION : Enzymatic treatment of cattle hide matrix - The effect of FITC on the activity of FITC labeled protease - Effect of molecular weights of protease on the diffusion - Diffusion and reaction mechanism of proteases in cattle hide matrixEn ligne : https://drive.google.com/file/d/1QDPKDq7Hvzq6ren7nS9eHkiT-NiXMA66/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21285
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 5 (05/2014) . - p. 138-145[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16230 - Périodique Bibliothèque principale Documentaires Disponible Diffusion and thermodynamic behavior of insect repellant and suntan lotion in automotive leather coatings / Loyd J. Burcham in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 5 (05/2004)
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Titre : Diffusion and thermodynamic behavior of insect repellant and suntan lotion in automotive leather coatings Type de document : texte imprimé Auteurs : Loyd J. Burcham, Auteur ; Hans Krose, Auteur Année de publication : 2004 Article en page(s) : p. 211-219 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The diffusion and thermodynamics of insect repellant and suntan lotion absorption into a series of polyurethane and polyacrylic resins used in leather finishing are examined. Physical testing of these resins applied as crosslinked and uncrosslinked thin-films on leather show that DEET exposure causes drastic reduction in Veslic dry rub fastness (greatly improved with a "desorption period" prior to testing). Reductions in rub fastness of samples exposed to suntan lotion were somewhat less severe than with DEET and were greatly improved by crosslinking, but severe yellowing observed during aging indicates continued degradation by non-volatile penetrants. Effective diffusion coefficients (De) and saturation weight uptake levels at equilibrium (Msat) were calculated from free-film gravimetric sorption experiments. These results indicate very high saturation levels (1000-4000 wt % for DEET absorption, ~200 wt % for suntan absorption) and even total dissolution of uncrosslinked polycaprolactone/polyester-based urethanes in DEET. Interestingly, Deep Woods OFF® (25 % DEET in an ethanol/hydrocarbon-based propellant) had identical saturation values as DEET, but with significantly higher diffusion rates - indicating diffusion promotion by highly volatile propellant solvents that do not remain absorbed in the polymer. More fundamentally, both the diffusion and saturation parameters were found to vary with the glass transition temperature, Tg, where higher Tg polymers exhibit lower diffusivity but higher equilibrium saturation levels. Calculations of sorption levels in thin-films on leather (using De values from free-film experiments) also reveal that surface wear properties degrade long before total saturation is achieved. En ligne : https://drive.google.com/file/d/10uImOEBv5_MMX7akJ1iR8pMxQymJPJxN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4195
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 5 (05/2004) . - p. 211-219[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001602 - Périodique Bibliothèque principale Documentaires Disponible Diffusion rate enhancement in leather dyeing with power ultrasound / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 6 (06/2003)
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Titre : Diffusion rate enhancement in leather dyeing with power ultrasound Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; P. G. Rao, Auteur Année de publication : 2003 Article en page(s) : p. 230-273 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Use of power ultrasound as a non-polluting method for accelerating/performing chemical as well as physical processes is gaining importance. The effect of power ultrasound in the dyeing of full chrome cow crust leather is compared with dyeing in the absence of ultrasound as a control experiment both in a stationary as well as conventional drumming condition. Ultrasonic probe (20 kHz, 0-400 W) was used for the experiments. Experiments were carried out with Acid red dye. The effect of ultrasonic output power has been studied and optimized. The influence of non-ionic surfactant or air bubbles in dye bath for ultrasonic assisted dyeing has been studied and found to be beneficial. The effect of ultrasonic pulse mode to get more benefits has also been studied. The diffusion coefficient has been calculated for dyeing with and without ultrasound and about 14 times improvement has been obtained from 80 W of ultrasound. En ligne : https://drive.google.com/file/d/1vCyssZwF-5FgptfXlTrM9Vr_VgLkmOwF/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4141
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 6 (06/2003) . - p. 230-273[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001588 - Périodique Bibliothèque principale Documentaires Disponible Digital & numérique : deux subventions complémentaires / Maëva Coureux in CTC ENTREPRISES, (04-05/2024)
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Titre : Digital & numérique : deux subventions complémentaires Type de document : texte imprimé Auteurs : Maëva Coureux, Auteur Année de publication : 2024 Article en page(s) : p. 9 Langues : Français (fre) Catégories : Aide économique
Commerce électronique
Economie numérique
Internet
SubventionsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Au fil des années, internet et les réseaux sociaux sont devenus des moyens de communication incontournables ; d'abord pour le grand public, puis pour les professionnels. Être visible sur internet est aujourd'hui un enjeu majeur pour les entreprises désireuses d’attirer et de conquérir de nouveaux clients, et de développer leur notoriété. Vous souhaitez vous lancer ? CTC, en lien avec les fédérations professionnelles, vous accompagne grâce à deux aides financières. En ligne : https://drive.google.com/file/d/10xtorJoehRXqm-COEGx5qXQMD4gA813V/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40723
in CTC ENTREPRISES > (04-05/2024) . - p. 9[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24604 - Périodique Bibliothèque principale Documentaires Disponible 24605 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Dimensional stability Type de document : texte imprimé Auteurs : Karl Flowers, Auteur Année de publication : 2020 Article en page(s) : p. 32-36 Langues : Anglais (eng) Catégories : Cuir dans les automobiles
Cuir sans chrome
Stabilité dimensionnelleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : It is very difficult to find a better paper on dimensional stability in leather than the Schröpfer and Meyer (2011) paper that was presented at the XXX1 IULTCS 2011 conference in Valencia, Spain. Prior to that paper, another valuable piece of the puzzle for dimensional stabililty had been given by the seminal paper on collagen which produced the 'Polymer-in-a-box' hypothesis, by Miles and Ghelashvili (1999). Bosch et al. (2002) completes the trio of perfect papers that tell the full story about when leather shrinks and how it will performan in temperature and humidity.
The motivation for this article is frustration at how one still hears that chromium tanned leathers have higher stability in leather articles. People who say this are of course correct, but they only tell a part of the story, and when they incorrectly say that chromium leathers have higher dimensional stability in cars, they go too far. Chromium-free leathers have higher dimensional stability in car upholstery - end of story. Schröpfer and Meyer (2011) show the superiority of chromium-free in car dimensional stability unequivocally.Note de contenu : - Polymer-in-a-box
- Hydration and dehydration
- Fig. 2 : The principle of the miles polymer-in-a-box hypothesis. The smaller the 'box', the more crowded the collagenm olecules are
- Fig. 3 : Chromium-free leather re-absorbs moisture evenly and rapidly and this seems pivotal to resisting dimensional changes
- Fig. 4 : Leather car upholstery will perform differently depending on temperature and humidity changesEn ligne : https://drive.google.com/file/d/1ATI1q0IMMbyjy0c6Q97sOf7u72WaaX0J/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34087
in INTERNATIONAL LEATHER MAKER (ILM) > N° 41 (05-06/2020) . - p. 32-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21717 - Périodique Bibliothèque principale Documentaires Disponible Direct chrome liquor recycling under indian conditions : Part 1. Role of chromium species on the quality of the leather / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)
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PermalinkDirect spectrophotometric determination of formaldehyde in leather wastewater by flow injection analysis with chromotropic acid / Zou Yuquan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 4 (07-08/2007)
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PermalinkDispositif d'introduction des peaux en tripe dans une refendeuse / Jérôme Darragon in CTC ENTREPRISES, (05/2009)
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PermalinkDissolution characteristics of protein in an ionic liquid / Xia Chunchun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 1 (01-02/2013)
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PermalinkDistribution of lipid classes with respect to area and stratigraphic location in a steerhide / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXI (Année 1966)
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PermalinkDistribution of mechanical properties in wool-on sheepskins / R. L. Boccone in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
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PermalinkDistribution of mechanical properties in wool-on sheepskins / R. L. Boccone in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
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PermalinkDistribution of mechanical properties in wool-on sheepskins in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 6 (11-12/1978)
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PermalinkDistribution topographique des propriétés des cuirs nappa pour vêtements / R. L. Boccone in TECHNICUIR, N° 8 (10/1977)
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PermalinkA diverse color-tunable luminous polyurethane leather coating based on long persistent phosphors and photochromic spiropyrans / Saiqi Tian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 4 (04/2019)
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PermalinkDNA and compound barcoding of raw materials / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 51 (01-02/2022)
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PermalinkDo leather anisotropic properties have an effect on shrinkage temperature ? / Ewa Marcinkowska in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 5 (05/2018)
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PermalinkLe dosage des acides aminés. Détermination de la richesse protéinique de la peau et de son utilisation / C. Marion in TECHNICUIR, N° 7 (08-09/1973)
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PermalinkDosage du formaldéhyde dans les cuirs : Comparaison des méthodes par chromatographie liquide et colorimétrie / Nicolas Blanc in CTC ENTREPRISES, N° 1 (01-02/2009)
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PermalinkDraft method for measurement of thickness of surface coatings on leather : SLP 31 in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)
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PermalinkDraft method IUP/10 (modified version) : Water resistance test for flexible leathers in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 70 (Année 1986)
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PermalinkDriving environmental improvements in the leather value chain / Isabella Griffiths in INTERNATIONAL LEATHER MAKER (ILM), N° 44 (11-12/2020)
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PermalinkDriving up environmental and social industry standards / Martin Ricker in INTERNATIONAL LEATHER MAKER (ILM), N° 49 (09-10/2021)
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PermalinkDrum geometry and design / E. Longstaff in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)
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PermalinkDrum salting hides and skins / G. W. Vivian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60, N° 6 (11-12/1976)
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