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Successful use of remnant : attractive reversible grain pattern / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 1 (01/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 1 (01/2017) . - p. 1-6 Titre : Successful use of remnant : attractive reversible grain pattern Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; Sathya Ramalingam, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2017 Article en page(s) : p. 1-6 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de bovins Microscopie électronique à balayage Oreille Résistance à l'abrasion Résistance à la déchirure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : At the present time, complete utilization of bovine parts will lead to the development of exotic leathers with attractive grain patterns. In this work an attempt has been made to prepare exotic leathers from the bovine ear, which is a solid waste from the slaughterhouse. Ears are the peculiar part of bovine, where a flexible cartilage (Type II collagen) is covered by the skin matrix (Type I collagen). The process for the preparation of the leathers from bovine ears has been optimized. The physical and morphological characteristics of the leathers have been carried out. The air permeability analysis revealed that the air permeability decreased with increase in the cartilage thickness. The processed ear possessed high resistance towards stitch tear and abrasion. The attractive reversible grain pattern along with genuine leather property provides an opportunity to utilize this material as a new source of raw material for leather making. Note de contenu : - Sedulous processing of bovine ear skins - Scanning electron microscopic analysis - Air permeability measurement - Stitch tear resistance and abrasion resistance En ligne : https://drive.google.com/file/d/1GicZ-bA3FoGm3GyFriVZyMk92633H4ZE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27560 [article]

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Biodegradation of leather solid waste and manipulation of methanogens and chromium-resistant microorganisms / Caroline Borges Agustini in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 1 (01/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 1 (01/2017) . - p. 7-15 Titre : Biodegradation of leather solid waste and manipulation of methanogens and chromium-resistant microorganisms Type de document : texte imprimé Auteurs : Caroline Borges Agustini, Auteur ; Wolmir Lourenço Neto, Auteur ; Guilherme P. S. Priebe, Auteur ; Marisa Costa, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2017 Article en page(s) : p. 7-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biogaz Cuirs et peaux -- Biodégradation Cuirs et peaux -- Déchets -- Recyclage Déchets -- Valorisation Déchets industriels -- Recyclage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The final solid wastes generated by tanneries are usually separately disposed of in hazardous industrial landfills, which are characterized as places of waste confinement where the residues undergo undesired and uncontrolled biological treatment. The storage and corresponding evolution of the sludge has not yet focalized the attention of the scientific community. Apart from developing knowledge of the ecology and function of the microbial community in anaerobic digestion processes, it is necessary to control this biological process. The manipulation of strict anaerobic microorganisms is the limiting factor in their isolation due to their high sensitivity to oxygen; therefore, cultivation under anaerobic conditions is essential. This work presents an evaluation of biogas generation and quality. In addition, microbial biodegradation is carried out in bench bioreactors containing two main solid wastes from tanneries: wet-blue shavings and sludge from a tannery wastewater treatment plant (WWTP). We analyzed two storage conditions of the sludge: storage under ambient conditions and under refrigeration. Sludge kept at ambient conditions showed a significantly higher methane production; methane was only detected in vials containing high concentrations of microorganisms. The manipulation of microorganisms did not interrupt biodegradation. The isolation technique with vials proved to be appropriate for the quantification of methanogenic microorganisms in biodegradation tests, although it was not fully elucidated for their isolation. Note de contenu : - MATERIALS AND METHODS : Bioreactor assembling - Biogas composition monitoring - Statistical analysis - Microbial collection and analysis - RESULTS AND DISCUSSION : Biogas and methane production - Statistical results - Microbiological results En ligne : https://drive.google.com/file/d/1sceXbIkeqzbHiY58k_0kIs9K846GK9kC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27564 [article]

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Poly(N-acryloyl ciprofloxacin-co-acrylic acid)-incorporated waterborne polyurethane leather coating with long-lasting antimicrobial property / Jinming Chang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 1 (01/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 1 (01/2017) . - p. 15-22 Titre : Poly(N-acryloyl ciprofloxacin-co-acrylic acid)-incorporated waterborne polyurethane leather coating with long-lasting antimicrobial property Type de document : texte imprimé Auteurs : Jinming Chang, Auteur ; Gaofu Yang, Auteur ; Qi Zeng, Auteur ; Zhonghui Wang, Auteur ; Zhou Xu, Auteur ; Yi Chen, Auteur Année de publication : 2017 Article en page(s) : p. 15-22 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Copolymères -- Synthèse Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Finition Polymères -- Synthèse Polymères en émulsion Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : o overcome the leaching problem associated with low-molecular-weight antimicrobial agents, a water soluble antimicrobial polymer, poly(N-acryloyl ciprofloxacin-co-acrylic acid), was designed and synthesized via acryloylation of the secondary amine in 7-piperazinyl substituent of ciprofloxacin and subsequent copolymerization with acrylic acid. The structure of the copolymer was characterized by 1H nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) spectra, X-ray photoelectron spectroscopy (XPS), and gel permeation chromatography (GPC). The copolymer was compatible with waterborne polyurethane for leather finishing, and remained antimicrobial even though the parent structure of ciprofloxacin molecule was altered. When incorporated into waterborne polyurethane leather coating as an antimicrobial agent, poly(N-acryloyl ciprofloxacin-co-acrylic acid) proved seldom leached out from the coating even after being rinsed for ten times. Based on these results, the water soluble antimicrobial copolymer designed in this study may prevent depletion of antimicrobial function of waterborne polyurethane leather coating, extending the lifetime of the leather products and enhancing their hygiene properties. Note de contenu : - Materials - Preparation of N-acryloyl ciprofloxacin (NACPF) - Synthesis of Poly(N-acryloyl ciprofloxacin-co-acrylic acid) - Characterization of Poly(NACPF)-co-AA) - Crust leather finishing by Poly(NACPF)-co-AA) incorporated WPU - Scanning Electron Microscope (SEM) observatin - Bactericidal test - Statistics En ligne : https://drive.google.com/file/d/123bCchShzKFoVumI-TtZ60-U7yV0pE91/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27565 [article]

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Evaluation of potential application for sunt pod extracts (Acacia nilotica) in leather tanning / A. I. Nasr in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 1 (01/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 1 (01/2017) . - p. 23-32 Titre : Evaluation of potential application for sunt pod extracts (Acacia nilotica) in leather tanning Type de document : texte imprimé Auteurs : A. I. Nasr, Auteur ; Hardy Mueller, Auteur ; M. M. Abdelsalam, Auteur ; A. H. Azzam, Auteur ; C. Jungandreas, Auteur ; W. Poppitz, Auteur Année de publication : 2017 Article en page(s) : p. 23-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants Additifs Analyse spectrale Colorimétrie Cuirs et peaux de moutons Extraction (chimie) Phénols Tanins végétaux Tannage végétal -- Analyse Viscosité Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The current investigation was carried out to evaluate the efficiency of using sunt, Acacia nilotica, pods extract in leather tanning. Skins from 16 Barki rams aged 12-18 months were cured and prepared for tanning using sunt pod extract. The sunt pods were collected and dried at 25°C for 5 days. Thereafter, the dried pods were ground by a 0.3 mm fineness grinder and were further subjected to the extraction procedure. Three chemical additives, namely NaOH, Na2SO3 and Na2CO3 were used for the extraction at 70 and 90°C. The influences of both types of chemical additive and extraction temperature on extraction yield were determined. The extract characteristics in terms of stiasny number, hide powder, tannins, non-tannins and total phenol contents were also analyzed. The results showed that increasing extraction temperature increased (P<0.05) extraction yield and improved the quality of the extract regardless of chemical additive type. Meanwhile, the extraction using either Na2SO3 in aqueous solution or by water at 90°C yielded the best extract characteristics. The elevated concentrations of condensed and hydrolysable tannins obtained in our results point to the possibility of utilizing sunt pod extract in tanning or re-tanning of leather rather than using traditional tanning reagents. Note de contenu : - EXPERIMENTAL : Raw material - Extraction procedure and experimental design - Total phenol and tannins content - Hide powder test - Stiasny number - Fourier Transform Infrared Spectrometry (FTIR) - Mass spectrometry (MS) - Determination of viscosity - Vis-spectroscopy and color measurement - Tanning procedure - Determination of leather - RESULTS AND DISCUSSION : Extracts quality determination - Leather properties En ligne : https://drive.google.com/file/d/1hA-XvIKsJlNx9HrDZywbDOC-wlmhhObt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27566 [article]

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