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Extraction of collagen short peptides from chrome tanned leather shavings / Jianru Dong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 167-175 Titre : Extraction of collagen short peptides from chrome tanned leather shavings Type de document : texte imprimé Auteurs : Jianru Dong, Auteur ; Bijun Zheng, Auteur ; Yi Yang, Auteur ; Siyu Sun, Auteur ; Yongqiang Tian, Auteur Année de publication : 2024 Article en page(s) : p. 167-175 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chimie analytique Collagène Cuirs et peaux Dérayures de cuir Extraction (chimie) Fermentation Hydrolyse Peptides Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, collagen peptide products (SFC) were prepared using solid-state fermentation of chrome tanned leather shavings (CTLS) by Serratia marcescens G and compared with alkali extracted collagen peptide products (AEC) and acid extracted collagen peptide products (ADC). SDS-PAGE electrophoresis revealed a wide relative molecular weight distribution for SFC and ADC, while AEC exhibited a concentration around 200 and 160 kDa. Scanning electron microscopy depicted a multi-layer sheet-like structure for SFC and ADC, contrasting with the dense block-like structure of AEC. X-ray diffraction indicated the formation of amorphous structures in products produced through acid or solid-state fermentation. Chromium content analysis through ICP experiments revealed levels in the order ADC > SFC > AEC. Thermal stability assessment using a rotational viscometer ranked the products as AEC > SFC > ADC. Measurement of pH effects on solubility determined the isoelectric points of SFC and AEC as pH = 6, while those of ADC were pH = 4. Experimental results on oil absorption, water absorption, water holding capacity, and emulsifying capacity showed that SFC exhibited the highest oil absorption capacity, ADC had the highest water absorption capacity, SFC and AEC demonstrated better water holding capacity, and SFC and ADC exhibited superior emulsifying capacity. Note de contenu : - MATERIALS AND METHODS : Materials - Solid-state fermentation of CTLS for the preparation of collagen peptides - Preparation of collagen peptides from CTLS by alkaline hydrolysis - Preparation of collagen peptides from CTLS by acid hydrolysis - Characterization of collagen peptides - RESULTS : Polyacrylamide gel electrophoresis - Fourier transform infrared spectroscopy scanning - UV spectral scanning - Scanning electron microscope - X-ray diffraction - ICP - Water absorption and oil absorption - Emulsifiying properties - Thermal denaturation temperature - Water-holding capacity - Solubility En ligne : https://drive.google.com/file/d/1rD77lR_K3RImEGxaIPbJ1_ZJ4Axfa9bG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41403 [article]

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Revitalizing tradition enhancing sustainability and aesthetics in ethiopian leather clothing / Genet Teka in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 176-184 Titre : Revitalizing tradition enhancing sustainability and aesthetics in ethiopian leather clothing Type de document : texte imprimé Auteurs : Genet Teka, Auteur ; Lidiya Yilma, Auteur ; Solomon Tsegaye, Auteur ; Ketema Alemu, Auteur ; Wegene Demisse, Auteur Année de publication : 2024 Article en page(s) : p. 176-184 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Artisanat Debelo Lemed Patrimoine culturel -- Analyse Vêtements en cuir Vêtements traditionnels -- Ethiopie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study explores the traditional Ethiopian leather garments, Debelo (hair-on leather clothing) and Lemed (hairless leather clothing), delving into their cultural significance and examining contemporary challenges that diminish their usage. Through a thorough analysis of traditional manufacturing processes and a comparison of physical properties of leathers processed by traditional and modern tanning techniques, we shed light on the practical limitations of these garments, including heaviness, strong odours, colour fading, and a lack of modern design elements. By employing a mixed-methods approach of interviews, questionnaires, and physical property testing, we trace the declining trend in the use of Debelo and Lemed. We propose innovative solutions that integrate modern tanned leathers with traditional craftsmanship, aiming to enhance the sustainability, aesthetic appeal, and physical quality of these garments. This approach seeks not only to overcome the practical limitations but also to rejuvenate these vital components of Ethiopian cultural heritage, ensuring their continued relevance in the global fashion industry. The research highlights the importance of preserving traditional crafts by adapting them to contemporary needs, thus contributing significantly to the field of cultural artifact conservation and sustainable fashion. Note de contenu : - EXPERIMENTAL SECTION : Materials and methods - Data collection and sampling - Geographical domain for the research - Comparative evaluation of physical and organoleptic properties of traditional and modern tanned sheep leathers : An analysis of hair-on and hairless varieties - Understanding the decline in traditional Debelo and Lemed leather garments : An analytical perspective - Improving the material quality and design of Debelo and Lemed leather garments - Physical and organoleptic properties of hair-on and hairless sheep leathers processed through traditional and modern techniques - - RESULTS AND DISCUSSION : Time-honored leather processing techniques of Amhara artisans - Traditional methods in Ethiopian Debelo and Lemed garment making - - Table 1 : Area of data collection and number of participants for data collection En ligne : https://drive.google.com/file/d/1Uh79YnubxB2xOVsg6_9COOkj95iKkT8L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41404 [article]

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Fluorescence labelling of amphoteric acrylic retanning agent / Jin Liqiang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 185-190 Titre : Fluorescence labelling of amphoteric acrylic retanning agent Type de document : texte imprimé Auteurs : Jin Liqiang, Auteur ; Gaosheng Zou, Auteur ; Wenbin Xun, Auteur ; Yulu Wang, Auteur ; Zhang Feifei, Auteur ; Hongxia Zhu, Auteur Année de publication : 2024 Article en page(s) : p. 185-190 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Composés amphotériques Cuirs et peaux Fluorescence Marquage (technologie) Polyvinylamine Retannage Transfert de masse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In recent years, there has been a growing focus on amphoteric retanning materials due to their crucial role in enhancing the electropositivity of retanned leather and improving the absorption of anionic dyes and fatliquors. This paper introduces a novel design and successful preparation of amphoteric retanning agents. Initially, a series of poly(N-vinylformamide-co-acrylic acid) copolymers were synthesized through a free radical copolymerization reaction initiated by azodiisobutyamidine hydrochloride. Subsequently, these polymers were hydrolyzed to produce an amphoteric retanning agent (A-PVAm) with a solid content of 15 %(Wt). Their structures were characterized using FT-IR, and their isoelectric points were determined through a zeta potential analyzer. Following this, a fluorescent tracer (FA-PVAm) was synthesized by reacting fluorescein 5-isothiocyanate with A-PVAm. This tracer was utilized to monitor the real-time penetration and mass transfer of A-PVAm during the retanning process as a signaling agent. The mass transfer of A-PVAm was observed concerning dosage and running time. It was observed that within 60 minutes, A-PVAm could evenly distribute throughout the leather. In instances where the retanning agent dosage was inadequate, the inner part of the crust showed minimal presence of the retanning agent. However, at dosages exceeding 20 %, the retanning agent exhibited uniform distribution within the leather. The utilization of the fluorescent tracing technique proved effective in creating a tracer to monitor the penetration of the amphoteric acrylic resin retanning agent in leather. This approach can assist in optimizing the molecule structure of the polyacrylate retanning agent and analyzing its mechanism of action. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of poly (N-vinylformamide-co-acrylic acid) copolymer (PNVF) - Preparation of amphoteric polyvinylamine retanning agent (A-PVAm) - The mass transfer and distribution of A-PVAm in crust - RESULTS AND DISCUSSION : Characterization of (PNVF) - Characterization of A-PVAm - Characterization of FA-PVAm - The mass transfer and distribution of A-PVAm in crust - Table 1 : Recipe of the preparation of PNVF - Table 2 : The application formulation of A-PVAm En ligne : https://drive.google.com/file/d/1l6KtiiRU5KjinwvROAzHg82Dvg4fcu9O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41405 [article]

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Properties of regenerated leather prepared using fibrous biomass / Chan-Wook Park in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 191-202 Titre : Properties of regenerated leather prepared using fibrous biomass Type de document : texte imprimé Auteurs : Chan-Wook Park, Auteur ; Young-Woo Kim, Auteur ; Sang Chul Lee, Auteur ; Eun-Chul Shin, Auteur ; Jae-Sik Seo, Auteur Année de publication : 2024 Article en page(s) : p. 191-202 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Champignons et constituants Collagène Cuir reconstitué Fibrilles de collagène La fibrille de collagène est une structure constituée d'un assemblage de fibres de tropocollagène (assemblage de 3 protéines de collagène alpha (alpha 1 - alpha 1 - alpha 2) en une hélice droite. Formulation (Génie chimique) kénaf et constituants Le Kenaf (Hibiscus Cannabinus L. et Hibiscus Sabdarifa L.), aussi appelé chanvre de Deccan, est une plante annuelle de la famille des Malvaceae. Le kenaf est apparenté au jute. Ces tiges épineuses d'1 à 2 cm de diamètre sont souvent, mais pas toujours ramifiée. Les feuilles de 10 à 15 cm de longueur sont de forme variable, celles de la base sont lobées et celles du sommet lancéolées. Les fleurs de 8 à 15 cm de diamètre sont blanches, jaunes ou pourpres. Le fruit est un capsule contenant plusieurs graines. Mesure Paille de riz Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The recycling of leather processing wastes and agricultural by-products is the most realistic alternative to address the causes of environmental pollution in conjunction with the aspect of resource recycling. Research has been actively conducted on the use of leather processing wastes for architectural interior materials, flooring materials, and regenerated leather. In the case of regenerated leather, it is attracting attention because its properties are different from those of natural leather and synthetic leather. Conversely, recycling research using waste mushroom media is still in the basic stage and remains at the level of simple recycling. In this study, we prepared regenerated leather samples using the following four raw materials in different mixing ratios and analyzed their properties : collagen fibre recovered from shaving scraps, kenaf fibre, rice straw fibre, and waste mushroom medium. The results of the physical property analysis show that the regenerated leather samples prepared with collagen fibre tend to have better tensile and tear strengths than those prepared with kenaf or rice straw fibre. Regarding the specific gravity of the material, the samples prepared with kenaf and rice straw fibres, which have porous structures, yielded poor results compared with the sample prepared with collagen fibre. In terms of softness, the sample prepared with animal-derived collagen fibre is superior compared with the samples prepared with plant-based kenaf and rice straw fibres. In conclusion, the regenerated leather samples prepared by mixing waste mushroom medium with collagen fibre exhibit superior properties compared with those of the samples prepared with kenaf or rice straw fibre. Note de contenu : - EXPERIMENTAL PROCEDURES : - Experimental materials - Manufacturing of regenerated leather - Measurements - RESULTS AND DISCUSSION : - Analysis of surface characteristics based on the type of natural fibre and the mixing included proportion of waste mushroom medium - Analysis of mechanical properties based on the type of natural fibre and the mixing proportion of waste mushroom medium - Analysis of specific gravity and softness based on the type of natural fibre and mixing proportion of waste mushroom medium - Table 1 : Properties of the materials used - Table 2 : Formulation of samples according to different fibre types - Table 3 : Surface characteristics based on the mixing ratio of natural fibre and waste mushroom medium En ligne : https://drive.google.com/file/d/1WsMNHMF1PsvBbKhE-LENIlgIQmm9_iTR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41406 [article]

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Inactivation of moderately halophilic soak liquor / Pinar Yilmaz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 203-209 Titre : Inactivation of moderately halophilic soak liquor Type de document : texte imprimé Auteurs : Pinar Yilmaz, Auteur ; Meral Birbir, Auteur ; Yasar Birbir, Auteur Année de publication : 2024 Article en page(s) : p. 203-209 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries -- Inactivation Bactéries halophiles Courants continus Courants électriques Cuirs et peaux -- Conservation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salted animal skins and preservation salt may contain various microorganisms in the leather industry. Microbial activities on the raw and preserved hides and skins may cause adverse effects during salting process, storage period, and soaking process on leather. Antimicrobial applications have a critical importance to prevent damage of microorganisms during these applications. Hence, the aim of the present study was to inactivate moderately halophilic isolates by 2A direct electric current treatment which cause skin degradation. Each moderately halophilic bacterial species (Terribacillus halophilus SLMHB10, Vibrio alginolyticus SLMHB12, Vibrio parahaemolyticus SLMHB13), which were previously isolated from soak liquor samples, and their mixed culture were separately treated with 2A DC in test media containing 25% NaCl solution, 10% NaCl solution, both 4% NaCl and organic substance. Although Terribacillus halophilus SLMHB10, Vibrio alginolyticus SLMHB12, and the mixed culture of three species were completely killed in 18 min, Vibrio parahaemolyticus SLMHB13 were completely killed in 12 min. As a conclusion, 2A direct electric current application were found fairly effective to kill moderately halophilic isolates recovered from soaking liquors in the leather industry. Note de contenu : - Test bacteria - Application of direct electric current on test isolates - Table 1 : Bacterial counts of the each isolate and mixed culture of moderately halophilic bacteria treated with 2 A direct electric current in 25 % NaCl saline solution - Table 2 : Bacterial counts of the each isolate and mixed culture of moderately halophilic bacteria treated with 2 a direct electric current in 10% nacl saline solution - Table 3 : Bacterial counts of the each isolate and mixed culture of moderately halophilic bacteria treated with 2 a direct electric current in 4% nacl + organic substance En ligne : https://drive.google.com/file/d/1MkQ7UjELSuHUtBwgly1H5I5axsfvbDnX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41407 [article]

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