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Leather solid waste : a review. A low cost adsorption material based on collagen fibre / Qiang Taotao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 109-113 Titre : Leather solid waste : a review. A low cost adsorption material based on collagen fibre Type de document : texte imprimé Auteurs : Qiang Taotao, Auteur ; Li Xiaoning, Auteur ; Ren Longfang, Auteur ; Wang Xuechuan, Auteur Année de publication : 2016 Article en page(s) : p. 109-113 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Adsorption 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. Collagène Cuirs et peaux -- Déchets -- Recyclage Ions métalliques Polymères ramifiés Réticulation (polymérisation) Tanins Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nowadays, collagen fibre attracts more and more domestic and foreign interest because of its unique structure and biological properties. Collagen fibre is the main component of leather solid waste and it has unique physical and chemical properties. lt is a potential biomass adsorption material with a wide range of applications. As an adsorption material, the cost of collagen fibre is low, il also has excellent biocompatibility and biodegradability. However, the studies have shown that the direct use of collagen fibre as an adsorbent material has disadvantages, such as low adsorption capacity, poor selectivity and inability to resist high temperatures. In order to meet the practical application conditions of adsorption, and broaden its application areas, many researchers have studied the modification of collagen fibre using metal ions, tannin, hyperbranched polymers, and aldehydes etc. The problems and the technological focus in the research of adsorbants based on collagen fibre are indicated. Note de contenu : - COLLAGEN FIBRE ADSORBENTS - MODIFICATION OF THE COLLAGEN FIBRE : Loaded with metal ion - Tannin immobilized on collagen fibre - Modification by hyperbranched polymer - Aldehyde crosslinking - Other modification methods - APPLICATION PROSPECTS En ligne : https://drive.google.com/file/d/1iSuy9ekUMSMEzxq_qgzgtCN49sMJsqH9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26442 [article]

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Optimising conditions for preparing collagen-type hydrolysates / Pavel Mokrejs in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 114-121 Titre : Optimising conditions for preparing collagen-type hydrolysates Type de document : texte imprimé Auteurs : Pavel Mokrejs, Auteur ; Dagmar Janacova, Auteur ; Lubomir Benicek, Auteur ; Tomas Plachy, Auteur ; Petr Svoboda, Auteur Année de publication : 2016 Article en page(s) : p. 114-121 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Collagène Déchets organiques -- Recyclage Hydrolysats de protéines Hydrolyse enzymatique Tendons -- Recyclage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tendons of slaughterhouse cattle are by-products in animal processing and contain a substantial proportion of collagen and also elastin. This contribution deals with preparing collagen-type hydrolysates from cattle tendons (long tendons, hind tendons, Achilles tendons, fore tendons) in a 3-stage process. Factors under investigation are effects of added enzyme and extraction temperature on efficiency of hydrolysis. The character of starting raw materials and technological conditions in hydrolysate preparation markedly affect hydrolysis efficiency. Lower efficiency of hydrolysis (percentage of starting material converted into hydrolysate), max. 30%, is achieved when processing long tendons containing a higher elastin proportion. On the contrary, when processing hind, Achilles and fore tendons, conversion nears 100%, thus evaluating starting raw material to the utmost. Hydrolysates prepared under defined conditions (adequate addition of enzyme and suitably chosen extraction temperature) from these tendons meet strict standards specifying ash content (2.0%) for food or pharmaceutical applications. High efficiency and variability of technological conditions in the processing of cattle tendons enables to prepare high quality products (hydrolysates or gelatines) suitable for food, cosmetics or pharmaceutical applications. Note de contenu : - TABLES : 1. Composition of cattle tendons - 2. Results of hydrolysis efficiency in cattle tendons processing - 3. Composition of collagen hydrolysates prepared from cattle tendons - FIGURES : 1. Flow chart of preparing collagen-based hydrolysates - 2. Influence of temperature and enzyme quantity on hydrolysis efficiency - 3. Influence of temperature and enzyme quantity on ash content hydrolysates En ligne : https://drive.google.com/file/d/1VXbOnTyDqH9_4HDew2CbmzE_yJbcC9A7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26443 [article]

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Determination active ingredients in bioflocculants for treatment of tannery wastewater / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 122-126 Titre : Determination active ingredients in bioflocculants for treatment of tannery wastewater Type de document : texte imprimé Auteurs : Changqing Zhao, Auteur ; Zhao Xingxiu, Auteur ; Gao Hongxia, Auteur ; Gu Haibin, Auteur ; Zhang Jing, Auteur ; Wei Zou, Auteur ; Yang Qinhuan, Auteur Année de publication : 2016 Article en page(s) : p. 122-126 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique Eaux usées -- Recyclage Floculant Glucides Glycoprotéines Huiles et graisses Osamines Tannage -- Déchets Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the present study, three bioflocculants were extracted from Bacillus cereus, Bacillus subtilis and Bacillus fusiformis, and their active components, including saccharides, proteins, glycoproteins, osamines, and fats, were analyzed. The results showed that saccharides were associated with flocculation. However, proteins had a weak effect on flocculation, and fats, osamines and glycoproteins had no effect. The findings elucidated the role of each ingredient in the removal of contaminants from tannery wastewater, providing a basic for understanding the mechanism of action of bioflocculants in the treatment of tannery wastewater. Note de contenu : - PREPARATION OF BIOFLOCCULANTS : Analysis of the active component of bioflocculants - RESULTS AND DISCUSSION : Activity analysis of saccharides - Activity analysis of glycoproteins - Activity analysis of fats - Activity analysis of osamines En ligne : https://drive.google.com/file/d/1RwesX_GqAxnHEF8av1Wi3TZz7VsA4fPm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26444 [article]

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Application of texture profile analysis (TPA) to evaluate the sensory properties of leather / Piotr Zapletal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 127-130 Titre : Application of texture profile analysis (TPA) to evaluate the sensory properties of leather Type de document : texte imprimé Auteurs : Piotr Zapletal, Auteur ; Kaja Bierowiec-Widòrek, Auteur ; Jerzy Balejko, Auteur ; Barbara Czerniejewska-Surma, Auteur ; Dorota Maj, Auteur Année de publication : 2016 Article en page(s) : p. 127-130 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse sensorielle Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Texture Cuirs et peaux de lapins Essais dynamiques Ganterie Gants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The studies assessed grain leather texture profile to objectively and precisely define their organoreptic characteristics two groups of rabbitskin hybrids, 12 pieces each : Group 1 : Belgian Giant Gray x Burgundy (BOS x BU), Group H : Belgian Giant Gray x White New Zeeland (BOS x BNZ). Hides subjected to a dressing for gloves. The research have shown a significant correlation between features, assessed sensory and instrumental. In the case of investigational leathers elasticity were significantly correlated with fullness in touch. It also showed the relationship between the hardness measured instrumentally, and softness and toughness evaluated organoleptically. The measurement results of texture parameters show that can be objectively assess and compare features, which are usually defined by our senses such as hardness, elasticity and flexibility. Note de contenu : - FIGURES : 1. The course of rabbit leather test on the device reotest - 2. The course of the force during the two cycles of deformation and geometric parameters of the test of TPA needed to calculate texture parameters - TABLES : 1. Evaluation of the organoleptic and test parameters TPA broiler rabbitskins for leather gloves - 2. Spearman correlations between organoleptic characteristics and TPA test parameters for gloving leather En ligne : https://drive.google.com/file/d/12PeYZ5iBEi2r7jWVyZR8XC_7kRGXqIb1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26445 [article]

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The impact of acid rain on vegetable tanned leather / Yanping Gao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 131-135 Titre : The impact of acid rain on vegetable tanned leather Type de document : texte imprimé Auteurs : Yanping Gao, Auteur ; Yang Shuang, Auteur ; Teng Bo, Auteur ; Jinwei Zhang, Auteur ; Jian Xiaoyun, Auteur ; Lucretia Miu, Auteur ; Carmen Gaidau, Auteur ; Wuyong Chen, Auteur Année de publication : 2016 Article en page(s) : p. 131-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Cuirs et peaux -- Analyse Cuirs et peaux -- Détérioration Cuirs et peaux -- Propriétés mécaniques Essais accélérés (technologie) Essais dynamiques Morphologie (matériaux) Pluies acides Tannage végétal Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Artificial acid rain was chosen to simulate the influences of gaseous pollutants on vegetable-tanned leather. The vegetable-tanned leather samples were soaked in the artificial acid rain for 0, 5, 10, 15, 20 and 25 days, at 50°C and 100% relative humidity conditions. Then, these samples were evaluated by various analytical methods. Micro hot table (MHT), differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to evaluate the influences of acid rain on thermal behaviours. Damage to mechanical properties were also analyzed by a standard method. Fourier transform infrared spectroscopy (FTIR) and optical microscopy were used to investigate the changes of structural and histological properties during ageing. With the extension of ageing time, thermal stability was gradually reduced to lower values, including shrinkage temperature, thermal denaturing temperature, associated enthalpy and temperature of maximum decomposition rate. ln addition, mechanical properties such as tensile strength, tear strength and elongation at break also gradually decreased. The FTIR results showed that, during the ageing process, the amide 1 and amide 11 bands of collagen were gradually shifted to lower numbers, indicating increasingly serious damage to the structure of the peptide chain corresponding to obvious fibril breakages which were also detected through optical microscopy. Note de contenu : - EXPERIMENTAL METHODOLOGY : Materials - Sampling - Preparation of artificial acid rain - Leather ageing process - Analytical methodology - RESULTS AND DISCUSSION : Thermal analysis - Mechanical properties - Morphology and structure En ligne : https://drive.google.com/file/d/1qSZYzF-OT_TZl-1LmxTyAgXz_8UA3qET/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26446 [article]

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Preparation and characterization of modified protein retanning agent based on leather waste / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 136-141 Titre : Preparation and characterization of modified protein retanning agent based on leather waste Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Zhang Ting, Auteur ; Ren Longfang, Auteur ; Qiang Taotao, Auteur Année de publication : 2016 Article en page(s) : p. 136-141 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylate de butyle Agents de tannage Caractérisation Collagène Cuirs et peaux -- Déchets -- Recyclage Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Greffage (chimie) Retannage Styrène Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Collagen extracted from leather wastes was used as the main raw material, a modified protein retanning agent was prepared by free radical polymerization reaction with butyl acrylate and styrene. The product was characterized by FT-IR, TEM, particle size analysis and other methods. The retanning properties were studied on goat garment leather. The results showed that grafting took place between collagen and the non-ionic monomers. The grafting rate was about 65%. The latex particles of the modified collagen cross-linking emulsion were spherical and uniform, the average particle size was about 117nm. The resistances of the product to electrolyte, acid and alkali were good. The thickening rate [substance increase] of the leather was about 10% when using the retanning agent. The leather has good resistance to wet and dry rubbing after retanning, the fixing effect was remarkable. The shrinkage temperature was up to 122°C. Compared with similar commercial retanning agents, the tensile strength and tearing strength of leather retanned by the self-prepared retanning agent increased by 28.5% and 37.8%, respectively. Note de contenu : - EXPERIMENTAL PROCEDURES : Reagents and apparatus - Preparation of modified collagen retanning agent - Characterization - The application of collagen retanning agent on leather - RESULTS AND DISCUSSION : Characterization of modified collagen retanning agent - The application of collagen retanning agent in leather En ligne : https://drive.google.com/file/d/1flVupBNcHccMn5FrnO29d9kywrKG8Yky/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26447 [article]

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The XVth Procter memorial lecture fact or fiction ? How much do we really know about the chemistsry of chromium today ? / H. M. N. H. Irving in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 142-153 Titre : The XVth Procter memorial lecture fact or fiction ? How much do we really know about the chemistsry of chromium today ? Type de document : texte imprimé Auteurs : H. M. N. H. Irving, Auteur ; D. Phil, Auteur Année de publication : 2016 Article en page(s) : p. 142-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie Chrome Index. décimale : 540 Chimie et sciences connexes En ligne : https://drive.google.com/file/d/1jzutTgAMTxJf2qGSxBBc5L5yrCFEvF7e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26448 [article]

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