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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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Titre : Rapid oxidative dehairing with magnesium peroxide and potassium peroxymonosulfate Type de document : texte imprimé Auteurs : Andrew G. Gehring, Auteur ; William N. Marmer, Auteur ; Chad E. Mazenko, Auteur ; Robert L. Dudley, Auteur Année de publication : 2006 Article en page(s) : p. 324-329 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sodium sulfide is traditionally used to remove hair from animal hides during tanning operations. However, alternatives to sodium sulfide are desired because sodium sulfide is an environmental pollutant that is quickly converted to highly toxic hydrogen sulfide gas if accidentally exposed to acid. In past research, we demonstrated that either alkaline calcium peroxide or alkaline hydrogen peroxide may be used as an effective substitute for concentrated sodium sulfide for rapid dehairing. More recently, we demonstrated the effectiveness of alkaline hydrogen peroxide with potassium cyanate. Here we similarly present alternative oxidative dehairing reagents/conditions, using magnesium peroxide and potassium peroxymonosulfate, which may also find application in either the packing plant or beamhouse. As observed with previously reported rapid dehairing, dehairing often is not thorough, leaving very short stubble. However, residual hair was readily removed with a sodium sulfide sharpening/hairburn, indicating that hair stubble was not immunized by the oxidative treatment. Dehairing reaction conditions that rapidly removed 80% or greater of hair from cattle hide pieces were observed for magnesium peroxide (5%, 15% NaOH, 200% float, 45°C, 8 min, hairburn process) and potassium peroxymonosulfate (5%, 15% NaOH, 200% float, 45°C, 7 min, hairburn process). Leather produced from matched side pieces that were subjected to these oxidative dehairing treatments was determined to take up less chromium yet was tougher than leather produced using conventional hairburn with sodium sulfide. Other physical testing results are also reported. En ligne : https://drive.google.com/file/d/187W3ZURmZXXDSwg5-Ulz-bJ-XteOfmY2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3991
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Code-barres Cote Support Localisation Section Disponibilité 005598 - Périodique Bibliothèque principale Documentaires Disponible Rapid 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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Titre : Rapid oxidative unhairing with alkaline calcium peroxide Type de document : texte imprimé Auteurs : Andrew G. Gehring, Auteur ; David G. Bailey, Auteur ; Gary L. DiMaio, Auteur ; Robert L. Dudley, Auteur ; William N. Marmer, Auteur ; Chad E. Mazenko, Auteur Année de publication : 2003 Article en page(s) : p. 216-223 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sodium sulfide is frequently used to remove hair from animal hides during tanning operations. However, since sodium sulfide is an environmental pollutant that is quickly converted to highly toxic hydrogen sulfide gas if accidentally exposed to acid, an alternative unhairing agent is desired. We have observed that calcium peroxide may be used to rapidly unhair cattle hides with efficiency similar to that of sodium sulfide. Under alkaline conditions (pH ~13), 5-15 % (w/w) calcium peroxide mixture applied in two back-to-back applications, afforded either complete or nearly complete unhairing within 10 minutes of total reaction time at a reaction temperature of ~45°C. Most of the removed hair was essentially broken down or dissolved in this rapid oxidative hairburn process. Alternatively, intact, long strands of hair could be removed and recovered (hairsave) with a single application of the calcium peroxide solution (solids removed) followed by rapid adjustment of the hair solids to an approximately neutral pH. However, hair stubble remained on the hide after subjected to this latter hairsave process. The alkaline calcium peroxide hairburn and hairsave processes were studied using hide pieces (laboratory-scale experiments) and matched sides (pilot-scale experiments) and compared to conventional hairburn with sodium sulfide. The studies revealed that shrinkage temperature, physical testing, dye shading, dye levelness and grain appearance were comparable. In addition, several commercially available non-sulfide sharpening agents, added during reliming of hide pieces, were demonstrated to remove residual hair stubble that remained after rapid oxidative hairburn. En ligne : https://drive.google.com/file/d/1IHk1VAMX6HZM61vQsuat_uami76ko9cI/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4139
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Code-barres Cote Support Localisation Section Disponibilité 001588 - Périodique Bibliothèque principale Documentaires Disponible Rapid 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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Titre : Rapid oxidative unhairing with alkaline hydrogen peroxide Type de document : texte imprimé Auteurs : William N. Marmer, Auteur ; Andrew G. Gehring, Auteur ; Robert L. Dudley, Auteur Année de publication : 2003 Article en page(s) : p. 351-358 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hair can be rapidly removed from a bovine hide with caustic sodium sulfide. A rapid unhairing of the hide while still on the carcass in the slaughterhouse is an attractive alternative, because such a process could be part of a pathogen reduction program targeting the safety of the meat. The major drawbacks to the procedure are the high concentrations of base required for the unhairing, the potential of generating toxic hydrogen sulfide and the disposal of the spent unhairing solutions. We have studied the use of caustic hydrogen peroxide as a potential rapid oxidative unhairing agent to replace sodium sulfide. High concentrations of sodium hydroxide were required for the hydrogen peroxide to be an effective rapid unhairing agent. At these high base concentrations damage to the grain was observed. We were able to reduce the amount of sodium hydroxide and still carry out an effective rapid unhairing by the addition of lime or KOCN to the reaction mixture. An added advantage of using lime or KOCN was the elimination of grain damage. Shrink temperatures and physical test data of the wet blue and crust leather produced from hides that had been unhaired with alkaline hydrogen peroxide were compared to the results obtained from wet blue and crust leather produced from hide unhaired with sodium sulfide/lime/soda ash. The wet blue produced from hides that had undergone the four unhairing protocols had identical shrink temperatures. The shrink temperatures did not correlate to the chromium content of the wet blue. The physical testing data were also identical for all four samples except for the tensile strength and toughness index. The crust leather made from hides unhaired by sodium sulfide/lime/soda ash had significantly lower values. As with the shrink temperatures there was not a correlation between the physical testing results and chromium content. En ligne : https://drive.google.com/file/d/13cgUTWnjrHL6mZ5cUixjGqaFPOTnC2ht/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4151
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Code-barres Cote Support Localisation Section Disponibilité 001591 - Périodique Bibliothèque principale Documentaires Disponible A 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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Titre : A rapid quantification of hydroxyproline in leather using High-Performance Liquid Chromatography - Fluorescence Detection (HPLC-FLD) method Type de document : texte imprimé Auteurs : Priya Narayanan, Auteur ; Suresh Sethurajan, Auteur ; Mohan Vedhanayagam, Auteur ; Kalarical Janardhanan Sreeram, Auteur Année de publication : 2023 Article en page(s) : p. 183-192 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse quantitative (chimie)
Chromatographie en phase liquide à hautes performances
Cuirs et peaux -- Analyse
Cuirs et peaux -- Teneur en collagène
HydroxyprolineIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the area of leather development research, determining collagen content through measurement of 4-Hydroxyproline (Hyp) has been major challenging task due to the interference of various leather-processing chemicals. To overcome this problem, for the first time we have used a High-Performance Liquid Chromatography coupled with Fluorescence Detection (HPLC-FLD) method for accurate determination of Hyp in leather samples through chemical derivatization of Hyp with 7-chloro 4 nitro benzofuran (NBD-Cl) reagent. The HPLC-FLD analysis was performed on a PICO TAG column with an isocratic mobile phase (80 % of 0.1M, pH 7.2 sodium acetate and 20% of acetonitrile, v/v) at a flow rate of 0.7mL/min. The detection was carried out at an excitation wavelength of 465 nm and its emission at 535nm. The retention time of Hyp was found to be ~3.5 minutes and the total run time was about 10 minutes. The method validation indicated that this analytical method is precise (3-12% RSD), accurate (90-100%), the limit of detection 0.01μg/ml, the limit of quantification - 0.03 μg/ml and linear (R2 -0.9995) over the concentration range of 0.1 -2.0 μg/ml. The obtained result indicated that the assay linear range was acceptable for repeated analysis and suitable for the complete range of hydroxyproline levels present in leather samples. Compared to the traditional method (IUC 17:1980), this analytical method demonstrates higher simplicity, specificity, reproducibility, and it could be useful for certifying leather products as well as inspecting international trade in leather and hides. Note de contenu : - EXPERIMENTAL : Materials and methods : Chemical - Chromatographic conditions - Preparation of standard hydroxyproline solution - Preparation of salple derivatization - Method validation - Linearity and concentration range - Limit of detection and quantification - Accuracy - Precision - Robustness - Estimation of fibrous protein in the tanned leather sample
- RESULTS AND DISCUSSION : Method development and optimization
- METHOD VALIDATION : Linearity - LOD and LOQ
- ACCURACY
- PRECISION : Robustness - Tanned leather sample
- Table 1 : Optimization of chromatographic method through changing the various parameters
- Table 2 : Summary of parameters in method validation
- Table 3 : Limits of detection (LOD) and quantitation (LOQ) of proposed method
- Table 4 : Precision of the proposed method
- Table 5 : Accuracy of the proposed method
- Table 6 : Robustness of the proposed method
- Table 7 : Total collagen content calculated using the equationDOI : https://doi.org/10.34314/jalca.v118i5.7359 En ligne : https://drive.google.com/file/d/1-2G5tcy3I72WO5k_-iNVP872ZwDTwX5_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39303
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Code-barres Cote Support Localisation Section Disponibilité 23954 - Périodique Bibliothèque principale Documentaires Disponible Rationalisation of wet-blue tanning / Jiasheng Su in INTERNATIONAL LEATHER MAKER (ILM), N° 64 (03-04/2024)
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Titre : Rationalisation of wet-blue tanning Type de document : texte imprimé Auteurs : Jiasheng Su, Auteur Année de publication : 2024 Article en page(s) : p. 58-61 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Produits chimiques
Gaspillage -- Lutte contre
Industrie -- Organisation, contrôle, etc.
Industrie -- Pollution -- Lutte contre
Produits chimiques -- Consommation -- RéductionIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A focus on the changes from the disposal of beamhouse and tanning enc-floats to their management for reuse. Enabling their introduction to subsequent processes as solutions of unused chemicals. Note de contenu : - The technology
- Soaking and preparation for unhairing/liming
- Hair removal and liming
- Deliming and bating processes
- Pickling and chrome tanning
- Flexible leather processing
- Layout and management
- Water management
- Chemical savings
- Environmental advantage
- Fig. 1 : Conventional gutter/gully arrangements for discharge
- Fig. 2 : Lime conveyor delivery to the limed fleshing operation
- Fig. 3 : Simple bunding arrangement for a single tanning drum
- Fig. 4 : Liming and tanning departments are bunded (self-contained) as indicated without discharge to the effluent treatment plant
- Table 1 : Chemical and water savings
- Table 2 : Summary of environmental advantages : Liming operations - Chrome tanning operations - In generalEn ligne : https://drive.google.com/file/d/1BsLox_QesP_IROX5DsvEMZPjY0vaqtGv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40882
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Code-barres Cote Support Localisation Section Disponibilité 24527 - Périodique Bibliothèque principale Documentaires Sorti jusqu'au 11/07/2024 Rationalisation du séchage des peaux en cours de finissage / C. Tissot in TECHNICUIR, (Années 1969-1970)
PermalinkPermalinkRaw material quality issues / P. J. Hadley in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 4 (04/2005)
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)
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)
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)
PermalinkPermalinkREACh : projet de restriction du chrome VI dans les cuirs / Céline Astruc in CTC ENTREPRISES, (01-02/2014)
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)
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)
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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