Application of gelatin extracted from chrome shavings for the glazed finishing of leather / M. Catalina in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 5 (05/2010) . - p. 138-144 Titre : Application of gelatin extracted from chrome shavings for the glazed finishing of leather Type de document : texte imprimé Auteurs : M. Catalina, Auteur ; Geoffrey E. Attenburrow, Auteur ; J. Cot, Auteur ; Anthony D. Covington, Auteur ; A. Paula M. Antunes, Auteur Année de publication : 2010 Article en page(s) : p. 138-144 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The objective of this work was to ascertain the performance of extracted gelatin from dechromed leather shavings as a coating in the finishing of leather. Gelatin is a protein-ased material isolated from chrome-tanned collagenic wastes. A comparison between a commercial protein-based product, extracted gelatin and a mixture of extracted gelatin/glycerol was carried out. Based on the results obtained in previous studies, two fixing agents were used to fix the finishing : 5-ethyl-1-aza-3,7-dioxabicyclo[3,3]octane (oxazolidine II) and ethylene glycol diglycidyl ether (EGDE). The mixture gelatin/glycerol (using glycerol as a plasticiser) presented satisfactory results, compared with the commercial product, for the abrasion, gloss and flex resistance, although a poor performance under wet rub fastness (assessment of 1 on the grey scale (ISO 105-A02, A03) and adhesion tests were found due to the hygroscopic nature of glycerol. The formulation for potential further studies was the extracted gelatin fixed with EGDE which showed the best performance on dry rub fastness (4-5 on the grey scale) and finish adhesion, and a good performance on resistance to abrasion and to flex (low loss of finishing and no cracking observed). The results confirmed the optential for gelatin, obtained from chrome shavings, to be used as a leather finishing agent. En ligne : https://drive.google.com/file/d/1BO1nsFXR6X0nyzNYe_RCH-6UdKfUJrBq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9358 [article]

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Bangladeshi leather industry : an ovierview of recent sustainable developments / H. L. Paul in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 1 (01-02/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 1 (01-02/2013) . - p. 25-32 Titre : Bangladeshi leather industry : an ovierview of recent sustainable developments Type de document : texte imprimé Auteurs : H. L. Paul, Auteur ; A. Paula M. Antunes, Auteur ; Anthony D. Covington, Auteur ; P. Evans, Auteur ; P. S. Phillips, Auteur Année de publication : 2013 Article en page(s) : p. 25-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement Cuirs et peaux -- Industrie -- Bangladesh Développement durable Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The government of Bangladesh has indentified the leather sector as one with considerable growth and investment potential ranked fifth in the export earning sector. Currently Bangladesh produces and exports quality bovine and ovine, caprine (buffalo and cow ; sheep and goat) leathers that have a good international reputation for fine textured skins. However, the entire leather sector meets only 0.5% of the world's leather trade worth US$75 billion. There are about 113 tanneries in Bangladesh that produce 180 million square feet of hides and skins per year. In addition there are about 30 modern shoe manufacturing plants engaged in the production of high-quality footwear, with over 2500 smaller footwear manufacturers also present in the sector. There are around 100 smaller-to-medium leather goods manufacturers, and a small number of niche larger manufacturers. The sector directly employs approximately 558 000 people. Most of the tanneries do not have proper effluent plants and generate 20 000m3 tannery effluent and 232 tonnes solid waste per day. Tannery liquid and solid wastes are a potential pollutant but also have a potential value. Specific technologies to convert wastes are required. These vary from crude and simple to highly sophisticated and complex. A proposed new leather park is expected to bring a clear transformation to the leather industry with a market increase in production, product diversification and new product lines with increased sustainability of the sector. Sustainable and cleaner production will be a key issue for the development without placing burdens on the environment. Note de contenu : - INTRODUCTION : Leather in Bangladesh - Tanning in Bangladesh - Livestock in Bangladesh - Leather export performance - Professional associations - CURRENT METHODS OF DISPOSAL OF SOLID AND LIQUID WASTE FROM THE BANGLADESH LEATHER INDUSTRY - CASE STUDY PROJECT : UNIDO - RE-TIE BANGLADES - CASE STUDY OF RECENT RESEARCH - CASE STUDY : EFFLUENT TREATMENT PLANT (ETP) - CASE STUDY : IMPACTS ON COMMUNITY OF POLLUTION - POSSIBLE TANNERY RELOCATIONS : TANNERY ECONOMIC ZONE En ligne : https://drive.google.com/file/d/11IyGpmwsrzJPIcUFSS6GQf6v6o6ZMO2_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17450 [article]

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Effect of hyaluronic acid on the properties of chrome-tanned leather / M. A. R. Siddique in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 2 (03-04/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 2 (03-04/2015) . - p. 58-69 Titre : Effect of hyaluronic acid on the properties of chrome-tanned leather Type de document : texte imprimé Auteurs : M. A. R. Siddique, Auteur ; A. Paula M. Antunes, Auteur ; Anthony D. Covington, Auteur Année de publication : 2015 Article en page(s) : p. 58-69 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide hyaluronique -- Elimination Cuirs et peaux -- Analyse Stabilité hydrothermale Travail de rivière (cuir) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In conventional beamhouse operations, the elimination of hyaluronic acid from hides takes place in the soaking stage in the presence of a neutral salt. The impact of sodium chloride and sodium silicate (sodium metasilicate salt)-cured hides along with green hides were investigated in terms of removal of hyaluronic acid. Throughout beamhouse operations, the opening up of fibre structure was investigated by scanning electron microscope (SEM). The residual hyaluronic acid in hide and pelt samples taken after each beamhouse operation was analysed through bio-chemical analysis assisted by UV-visible spectrophotometry. The interaction of residual hyaluronic acid with chromium (III) was investigated in terms of deposition of chromium(III) in cross-sectional layers of chrome-tanned leather through scanning electron microscope — energy dispersive x-ray spectroscopy (SEM-EDX). The hydrothermal stability of chrome tanned leather was investigated by differential scanning calorimetry (DSC). It was found that sodium chloride can remove hyaluronic acid completely in the soaking operation and facilitate good opening and splitting up of fibre structure, which enables good penetration and fixation of chromium(III) species with the purifier collagen. In contrast, in the absence of a neutral salt, residual hyaluronic acid existed throughout the beamhouse operations which resulted in poor opening and splitting up of fibre bundles and later inhibited the penetration of chromium(Ill) species in cross-sectional layers. As a result, comparatively lower hydrothermal stability was observed. Sodium silicate-cured hides did not provide satisfactory results in terms of removing the hyaluronic acid present in the hide, poor opening and splitting up of fibre structure were observed and residual hyaluronic acid was identified even at pickle stage. As a result, the distribution of chromium(Ill) species at the cross-sectional layers varied widely and poor hydrothermal stability of tanned leather was observed after chrome tanning. Note de contenu : - APPROACH AND METHODOLOGY - EXPERIMENTAL METHODS : Raw materials and sampling - Curing of green hides - Chrome tanning - Chemical analysis for hyaluronic acid - Analysis of the opening up of fibre structure - Analysis of chromium distribution in the leather - Characterization of hydrothermal stability - Curing of green hides - Removal of hyaluronic acid - Opening up of fibre structure - Chromium(III) distribution in the cross-sectional layers of tanned leather (grain to flesh - Hydrothermal stability (shrinkage temperature) of chrome-tanned leather En ligne : https://drive.google.com/file/d/1j-K08EqSzq5G2G1bUGnf1uNHq0iy1z_n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23742 [article]

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Investigation into deep eutectic solvents / Andrew Abbott in LEATHER INTERNATIONAL, Vol. 217, N° 4860 (05/2016)  

[article]  inLEATHER INTERNATIONAL > Vol. 217, N° 4860 (05/2016) . - p. 26-31 Titre : Investigation into deep eutectic solvents Type de document : texte imprimé Auteurs : Andrew Abbott, Auteur ; A. Paula M. Antunes, Auteur ; Anthony D. Covington, Auteur ; Bokamoso Mmapatsi, Auteur ; William R. Wise, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2016 Article en page(s) : p. 26-31 Langues : Anglais (eng) Catégories : Cuirs et peaux de chèvres Eau -- Consommation -- Réduction Eutectiques Un eutectique est un mélange de deux corps purs qui fond et se solidifie à température constante, contrairement aux mélanges habituels. Il se comporte en fait comme un corps pur du point de vue de la fusion. C'est aussi le point du diagramme (mélange avec une proportion donnée) pour lequel le mélange est à sa température minimale en phase liquide. Cette température est propre à chaque mélange. pH Poudre de peaux solvants Stabilité hydrothermale Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Novel deep eutectic solvents for the purpose of the reduction of water usage in leather manufacturing. Water in the wet processes of leather manufacture acts as a solvents, transportation medium, support system and is an integral component of the collagen matrix stability at the macro and molecular levels. There have been proposals as to what extent water can be substituted with non-aqueous media, partly due to its role in collagen and processing. As the water content increases from bulk to float water, the system acts as a transport medium for chemicals as well as a support system in processing vessels. Here, deep eutectic solvents (DESs) are investigated as an alternative solvent system to conventional tanning systems. Note de contenu : - TABLE : The cabinet conditions of leather samples prior to testing - FIGURES : 1. Schematic representation of a eutectic point on a two component phase diagram - 2. The effect of substrate water content on the hydrothermal stability of chromium tanned goatskin powder processed with the type 2 DES system - 3. The effect of pH on the hydrothermal stability of goatskin powder processed with the type 2 DES system, pH was varied by 2, 4, 6 and 8 - 4. The effect of temperature on the hydrothermal stability of goatskin powder chromium tanned with the type 2 DES system - 5. The effect of chromium concentration on hydrothermal stability of goatskin powder processed with the type 2 DES system - 6. Effect of the sulphate counterion on the hydrothermal stabilty of the type 2 DES processed goatskin powder En ligne : https://drive.google.com/file/d/1dCIvT1t_zJ78VzwSamrLBy56i_NzYigF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26468 [article]

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Methods of isolation and identification of pathogenic and potential pathogenic bacteria from skins and tannery effluents / Anne Lama in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 2 (02/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 2 (02/2013) Titre : Methods of isolation and identification of pathogenic and potential pathogenic bacteria from skins and tannery effluents Type de document : texte imprimé Auteurs : Anne Lama, Auteur ; Margaret Bates, Auteur ; Anthony D. Covington, Auteur ; Stuart C. Allen, Auteur ; A. Paula M. Antunes, Auteur Année de publication : 2013 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Identification Bactéries -- Isolement Bactéries pathogènes Cuirs et peaux -- Analyse Eaux usées -- Analyse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Currently there is no standard protocol available within the leather industry to isolate and identify pathogenic bacteria from hides, skins or tannery effluent. This study was therefore carried out to identify simple but effective methods for isolation and identification of bacterial pathogens from the effluent and skins during leather processing. Identification methods based on both phenotypic and genotypic characteristics were investigated. Bacillus cereus and Pseudomonas aeruginosa were used as indicator bacteria to evaluate the isolation and identification methods. Decontaminated calfskins were inoculated with a pure culture of the above mentioned bacterial species followed by pre-tanning and chromium tanning processes. Effluent samples were collected and skins were swabbed at the end of each processing stage. Bacterial identification was carried out based on the phenotypic characteristics; such as colony appearance on selective solid media, cell morphology following a standard Gram-staining and spore staining techniques, and biochemical reactions, e.g., the ability of a bacterial species to ferment particular sugars and ability to produce certain enzymes. Additionally, an identification system based on bacterial phenotypic characteristics, known as Biolog® system was applied. A pulsed-filed gel electrophoresis (PFGE) method for bacterial DNA fingerprinting was also evaluated and used for the identification of the inoculated bacteria. The methods described in the study were found to be effective for the identification of pathogenic bacteria from skins and effluent. Note de contenu : - MATERIALS AND METHODS : Isolation and primary identification of inoculated bacterial species - Gram-staining and spore-staining - Biochemical following standard methods - The biolog system for bacterial identification - Extraction and purification of bacterial DNA for pulsed-field gel electrophoresis (Bacillus cereux - Pseudomonas aeruginosa) - Digestion of the bacterial DNA - Electrophoresis of bacterial DNA - RESULTS AND DISCUSSION : Bacterial growth on selective media (Bacillus cereus - Pseudomonas aeruginosa) - Gram-staining and spore-staining - Biochemical tests - The biolog system for bacterial identification - Electrophoresis of bacterial DNA En ligne : https://drive.google.com/file/d/1-cjGV1x0pnaNgB2dUiGLRtm5YRBYxREf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17372 [article]

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Microbial keratinase and its potential application in th management of tannery hair waste / Arthur Onyuka in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 12 (12/2014)  

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Microorganisms : growth in the tannery / Anne Lama in LEATHER INTERNATIONAL, Vol. 213, N° 4816 (11-12/2011)  

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Optimization of enzyme-assisted phenolic reactions applied to thermal stabilization of collagen using response surface methodology / Leticia Melo Dos Santos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 2 (02/2016)  

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Parameters for composting tannery hair waste / Arthur Onyuka in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 5 (05/2012)  

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Survival and growth of bacillus cereus, pseudomonas aeruginosa and staphylococcus aureus in extreme environments present during the early stages of a conventional leather making process / Anne Lama in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 6 (06/2012)  

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