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675 : Technologie du cuir et de la fourrure |
Ouvrages de la bibliothèque en indexation 675
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Rapid determination of six aldehydes in leathers by ultra performance liquid chromatography / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 4 (07-08/2013)
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Titre : Rapid determination of six aldehydes in leathers by ultra performance liquid chromatography Type de document : texte imprimé Auteurs : Yu Lingyun, Auteur ; Zhao Changsheng, Auteur ; Wu Mengru, Auteur ; Dong Wei, Auteur ; Liu Surui, Auteur ; Gou Yun, Auteur ; Jin Jing, Auteur ; Wen Yanqing, Auteur ; Lin Wei, Auteur Année de publication : 2013 Article en page(s) : p. 149-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aldéhydes Un aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle.
L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse.
Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde.
Chromatographie en phase liquide à hautes performances
Cuirs et peaux -- Analyse
Extraction par ultrasons
UltrasonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A simple pre-column derivatization method using (2,4-Dinitrophenylhydrazine, DNPH) as pre-column labeling reagent followed by ultra performance liquid chromatography (UPLC) with a Photo-Diode Array detector (PDA) has been developed for the determination of six aldehydes: glyoxal, formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, glutaraldehyde in leather samples. Acetonitrile and 0.1% sodium dodecyl benzene sulfonate aqueous solution (1:1, VN) was used for the ultrasonic extraction at 40°C. A derivatizing parameter — temperature was investigated in detail. Under optimal conditions, the quantification limits were obtained for the desired compounds ranging from 25 to 45pg P. The recoveries were higher than 90.6%. The proposed method was successfully applied to the determination of the target compounds in leather samples with a higher sensitivity than traditional high performance liquid chromatography (HPLC) and UV — visible scenery spectrophotometry (UV-Vis) methods. Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Reagents - Extraction - Derivatization procedure - UPLC conditions - Quantification
- RESULTS AND DISCUSSION : Effect of reaction temperature on derivatization - Sample extraction - UPLC separation - Linearity and detection limit - Recoveries and precision - Comparison of the proposed method with standard methods - ApplicationEn ligne : https://drive.google.com/file/d/1KdBAVZn101fx86dKDDKiGZQMp3bo5wkG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19219
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 4 (07-08/2013) . - p. 149-153[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15393 - Périodique Bibliothèque principale Documentaires Disponible Rapid fiber opening process for skins : an approach for fail-safe chemical-free process / Jayanthi Durga in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 1 (01/2015)
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Titre : Rapid fiber opening process for skins : an approach for fail-safe chemical-free process Type de document : texte imprimé Auteurs : Jayanthi Durga, Auteur ; Ammasi Ranjithkumar, Auteur ; Ramakrishnan Ramesh, Auteur ; Chellan Rose, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2015 Article en page(s) : p. 7-12 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbohydrases
Cuirs et peaux -- Analyse
Cuirs et peaux de chèvres
Epilage enzymatique
Travail de rivière (cuir)
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Conventional beamhouse operations adopted by the global tanning industry are coming under the close scrutiny of the environmentalists on account of the possible adverse effect on human health and environment. Lime, which is used to the tune of about 10% on the weight of the raw hides and skins, in re-liming stage contribute to generation of large quantities of sludge, the disposal of which is a serious concern. Also the process duration to achieve the required fiber opening in the re-liming process is very long, ranging from 24-72 hrs for different substrates and end products. Enzyme based beamhouse processes are being advocated to overcome the problems associated with the conventional processes. However, enzyme based methods need greater control over process parameters to achieve satisfactory results in leather processing and avoid damage to the pelt. To overcome the problems associated with the conventional re-liming process, an attempt has been made in the present investigation to utilize cocktail of carbohydrases for fiber opening of hides and skins. Fiber opening at optimized concentration of the above enzyme has been studied for its efficiency on goatskins. A process using optimum quantity of enzyme led to fiber opening in 30 minutes. The efficacy of enzyme on rapid fiber opening of dehaired skin was studied at different experimental conditions of pH, time and enzyme concentration. The performance of the enzyme in the given experimental conditions was assessed by quantifying the removal of carbohydrate and proteoglycan and examining the fiber opening by scanning electron microscopic studies. Effect of enzyme on the final quality of the leather was evaluated by changes in chemical characteristics, physical properties and visual examination. Note de contenu : - EXPERIMENTAL : Optimization of enzyme concentration - pH optimization - Time course study - Carbohydrate assay - Estimation of proteoglycan - Scanning electron microscopic analysis - Physical testing and visual assessment
- RESULTS AND DISCUSSION : Effect of enzyme concentration of fiber opening - Effect of pH on fiber opening - Effect of time on fiber opening - Chromium content of wet blue leather - Scanning electron micrography - Physical and organoleptic propertiesEn ligne : https://drive.google.com/file/d/1exmz-jTGm0C0NTh0WpzBYlQtS-Ni_g4y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22791
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 1 (01/2015) . - p. 7-12[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16774 - Périodique Bibliothèque principale Documentaires Disponible Rapid improvement of wool keratin fertiliser efficiency based on electrodegradation / Shu Caihong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)
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Titre : Rapid improvement of wool keratin fertiliser efficiency based on electrodegradation Type de document : texte imprimé Auteurs : Shu Caihong, Auteur ; Zhongzhen Long, Auteur ; Zhijun Chen, Auteur ; Dai Rui, Auteur ; Shan Zhihua, Auteur Année de publication : 2022 Article en page(s) : p. 83-89 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Electrochimie
Engrais organiques
kératineLa kératine est une protéine, synthétisée et utilisée par de nombreux êtres vivants comme élément de structure, et également l'exemple-type de protéine fibreuse.
La kératine est insoluble, et peut être retrouvée sur l'épiderme de certains animaux, notamment les mammifères, ce qui leur garantit une peau imperméable. Parfois, lors d'une friction trop importante, la kératine se développe à la surface de la peau formant une callosité. Les cellules qui produisent la kératine meurent et sont remplacées continuellement. Les morceaux de kératine qui restent emprisonnés dans les cheveux sont couramment appelés des pellicules.
La molécule de kératine est hélicoïdale et fibreuse, elle s'enroule autour d'autres molécules de kératine pour former des filaments intermédiaires. Ces protéines contiennent un haut taux d'acides aminés à base de soufre, principalement la cystéine, qui forment un pont disulfure entre les molécules, conférant sa rigidité à l'ensemble. La chevelure humaine est constituée à 14 % de cystéine.
Il y a deux principales formes de kératines : l'alpha-kératine, ou α-keratin, présente chez les mammifères notamment, dont l'humain, et la bêta-kératine, ou β-keratin, que l'on retrouve chez les reptiles et les oiseaux. Ces deux types de kératines ne présentent clairement pas d'homologie de séquence.
Chez l'être humain, la kératine est fabriquée par les kératinocytes, cellules se trouvant dans la couche profonde de l'épiderme. Les kératinocytes absorbent la mélanine (pigment fabriqué par les mélanocytes), se colorent et ainsi cette pigmentation de l'épiderme permet de protéger les kératinocytes des rayons ultraviolets du Soleil.
Laine -- Déchets
Laine -- Détérioration
Poids moléculaires
Recyclage (déchets, etc.)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Waste wool is one of the largest waste solids of animal skin processing. After abandoning the application of feed to avoid Spongiform Encephalopathy, the application of agro-ecological wool keratin fertiliser is an alternative approach for utilising this waste. Because hair keratin has a strong ability to resist degradation in nature and to avoid using large amounts of water and chemicals electrochemical degradation was used in this experiment to achieve quick and efficient absorption by plants. At a current density of 150A/m2, a sodium chloride content of 6%, and a temperature of 25-27°C for 2 hours, 90% of 10g of wool can be electrolysed into a microemulsion. The electrochemical wool keratin degradation product (KDP) contains oligopeptides based on tripeptides of molecular weight 359(Mn) with a mean aggregate particle size of 458.8nm in solution. KDP has a very different composition than raw wool, contains a large amount of ammonium salt and taurine, and is an excellent raw material for agricultural fertiliser. The release of nitrogen in soil and the growth of pak choy indicated the effective utilisation of wool keratin after electrochemical degradation. Note de contenu : - MATERIALS AND METHODS : Materials - Electrochemical degradation - Analysis of the KDP of electrochemical degradation - Application of KDPs in the field
- RESULTS AND DISCUSSION : Electrochemical degradation and characterisation of wool - Nitrogen release and pak choy planting
- Table 1 : Molecular weights of the KDP
- Table 2 : N and S contents in the raw wool, KDP and KUP after electrolysis
- Table 3 : Main agronomic traits of pak choyEn ligne : https://drive.google.com/file/d/12HJm7p7puz9gvtdRw0gxAe--vJ7CWFyN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37487
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 2 (03-04/2022) . - p. 83-89[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23351 - Périodique Bibliothèque principale Documentaires Disponible A rapid method for measuring elastin degradation and its application in leather manufacturing / Xu Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 8 (08/2020)
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Titre : A rapid method for measuring elastin degradation and its application in leather manufacturing Type de document : texte imprimé Auteurs : Xu Zhang, Auteur ; Mengchu Gao, Auteur ; Chunxiao Zhang, Auteur ; Sadaqat Ali Chattha, Auteur ; Biyu Peng, Auteur Année de publication : 2020 Article en page(s) : p. 294-300 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chromatographie en phase liquide à hautes performances
ConfitageLe confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
DesmosineLa desmosine est une structure moléculaire formée par l'association de quatre chaînes latérales de lysine. On la retrouve associée à l'élastine où elle forme des interconnexions (liaisons covalentes) entre les différentes fibres et participe ainsi à ses propriétés mécaniques. (Wikipedia)
Elastine -- Détérioration
Liqueurs de tannage
Tannage au chrome
Teneur en desmosine
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The degradation of elastin in skins during leather manufacturing can increase the yield area, softness and flatness of the leather, but, excessive degradation of elastin in leather processing induces looseness and increases veininess in the final leather product. However, the characterization of the degradation degree of elastin in skins and leathers was mostly studied through histological analysis qualitatively. There is an urgent need to develop a more efficient quantitative analytical strategy to evaluate the degradation of elastin in leather making processes. In this study, a simple and rapid HPLC method is developed for measuring elastin degradation in skins, leathers and leather processing liquors through determining the biological markers of elastin, namely desmosines. The separation of analytes was conducted on an C18 column (4.6 × 150 mm, 4.0 μm) at 30 ℃; the wavelength of diode array detector (DAD) was set at 275 nm; the mobile phases were composed of methanol and aqueous acetic acid (2.0 %, v/v). A gradient elution was carried out at a flow rate of 0.5 mL/min. It has been witnessed that Cr (III) has no effect on the retention time and peak area of desmosines, when the concentration of Cr (III) was in the range of 0 to 200 mg/L. In quantitative analysis, all of the calibration curves showed good linear regression (R2 ≥ 0.9990) within the tested ranges, and the recovery of desmosines was 100.9 % and 102.6 % for elastin hydrolysate and Cr-tanned elastin hydrolysate, respectively. The content of desmosines in elastin fiber, Cr-tanned elastin fiber and leather manufacturing liquors measured by established HPLC-DAD were comparable to the results obtained by amino acid analyzer. In the wet blue bating process, the quantitative analysis results are consistent with the histological staining results. The results demonstrate that the developed method is accurate and effective and can be readily utilized for the comprehensive process control of leather manufacturing. Note de contenu : - MATERIALS AND METHODS : Chemicals and reagents - Standard solutions - Preparation of samples - HPLC-DAD conditions - Method validation - Wet blue bating process - Determination of desmosines by amino acid analyzer
- RESULTS AND DISCUSSION : Optimization of HPLC conditions - Effect of Cr(III) on des quantitation - Method validation - Determining contents of desmosines in varying leathe processing liquors - Wet blue bating processDOI : https://doi.org/10.34314/jalca.v115i8.3842 En ligne : https://drive.google.com/file/d/1wYegzMOMz23n_3RRtHL5xozXaGO0kzXm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34436
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 8 (08/2020) . - p. 294-300[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22195 - Périodique Bibliothèque principale Documentaires Disponible Rapid oxidative dehairing using alkaline hydrogen peroxide and potassium cyanate : reuse of the dehairing reagents / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 5 (05/2005)
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Titre : Rapid oxidative dehairing using alkaline hydrogen peroxide and potassium cyanate : reuse of the dehairing reagents Type de document : texte imprimé Auteurs : William N. Marmer, Auteur ; Robert L. Dudley, Auteur Année de publication : 2005 Article en page(s) : p. 165-173 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Studies have continued on rapid dehairing of cattlehide using an oxidative system of alkaline hydrogen peroxide and potassium cyanate. For economic viability, the dehairing mixture needs to be used for more than one dehairing cycle. The number of cycles is dependent upon the residual concentration of the reagents in solution, namely, NaOH, H2O2 and KOCN. The concentrations of these reagents were measured after each dehairing cycle. In addition the solubilized protein concentration and the amount of insoluble material suspended in solution were determined. NaOH, H2O2 and KOCN all decreased with an increase in the number of dehairing cycles. After the 6th or 7th cycle the dehairing times had increased to the point where dehairing still occurred, but was no longer rapid. There was a buildup of, soluble protein in solution as well as suspended (insoluble) material with increasing dehairing cycles. Both the protein and insoluble (mostly hair) material reacted with the dehairing chemicals, resulting in a decrease in the efficacy of the dehairing mixture. Nevertheless, the system appears to offer a viable alternative to sulfide-based rapid dehairing, and further experimentation on a pilot plant scale is merited. En ligne : https://drive.google.com/file/d/1OckTNTPh91tsC3PX1V58kw7OpOUbQZui/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4064
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Code-barres Cote Support Localisation Section Disponibilité 002056 - Périodique Bibliothèque principale Documentaires Disponible Rapid oxidative dehairing with magnesium peroxide and potassium peroxymonosulfate / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 9 (09/2006)
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PermalinkRapid oxidative unhairing with alkaline calcium peroxide / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 6 (06/2003)
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PermalinkRapid oxidative unhairing with alkaline hydrogen peroxide / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 9 (09/2003)
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PermalinkA rapid quantification of hydroxyproline in leather using High-Performance Liquid Chromatography - Fluorescence Detection (HPLC-FLD) method / Priya Narayanan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 5 (05/2023)
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PermalinkRationalisation of wet-blue tanning / Jiasheng Su in INTERNATIONAL LEATHER MAKER (ILM), N° 64 (03-04/2024)
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PermalinkRationalisation du séchage des peaux en cours de finissage / C. Tissot in TECHNICUIR, (Années 1969-1970)
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PermalinkPermalinkRaw material quality issues / P. J. Hadley in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 4 (04/2005)
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PermalinkRaw skin wastes - Used to prepare a collagen fibre adsorbent for the chromatographic separation of flavonoids / Zhang Qixian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 3 (05-06/2014)
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PermalinkRaw skin wastes - used to prepare a flocculant for the treatment of black liquor for papermaking / Chi Yuanlong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 5 (09-10/2011)
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PermalinkPermalinkREACH brings a major challenge for the chemical and leather imports into the European Community / A. G. Puentener in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 12 (12/2007)
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PermalinkPermalinkREACh : projet de restriction du chrome VI dans les cuirs / Céline Astruc in CTC ENTREPRISES, (01-02/2014)
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PermalinkREACh et ses conséquences pour la filière cuir in INDUSTRIE DU CUIR (IDC), N° 2010/02 (03-04/2010)
PermalinkPermalinkPermalinkReaching zero the ISO way / Chris R. Ehret in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 2 (02/2003)
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PermalinkReaction mechanism of tetrakis hydroxymethyl phosphonium with collagen protein / Li Ya in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)
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PermalinkReaction of gelatin and chitosan with water soluble carbodiimides / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 2 (02/2017)
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