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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CXIX, N° 2Mention de date : 02/2024Paru le : 15/02/2024 |
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Ajouter le résultat dans votre panierSustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
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Titre : Sustainable finished leather preservation : Part I - Myrobalan capped copper nanoparticles Type de document : texte imprimé Auteurs : Ruby Shekinah, Auteur ; Saranya Kailasam, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 55-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Cuirs et peaux -- Conservation
Cuirs et peaux -- Finition
Cuivre
Formulation (Génie chimique)
Myrobalan et constituants
Nanoparticules
Nanoparticules -- Synthèse
Produits de conservation du cuir
Réduction (chimie)
RevêtementsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Copper nanoparticles were synthesized using myrobalan (tannin) extract as a reducing agent. The synthesized nanoparticles were used in the coating of leather after the finishing process of upper leather to enhance the antimicrobial properties of leather. Primarily, the synthesized myrobalan copper nanoparticles (M-CuNPs) were characterized using UV-Spectroscopy (UV), which resulted in an absorption peak at 412 nm, confirming the presence of CuNPs in the solution. The size distribution and zeta potential values of M-CuNPs were analyzed by Dynamic Light Scattering (DLS) which resulted in an average particle size of 104 nm and zeta potential value of -28mv. These values affirm the stability of the M-CuNPs. Scanning Electron Microscope (SEM) image showed that the particles are spherical in shape. The elemental composition of M-CuNPs was confirmed using Energy dispersive X-ray (EDX) studies. Fourier transform infrared (FTIR) spectra showed peaks at 3173 cm-1, 1727 cm-1, 1147 cm-1, and 624 cm-1, which correspond to -OH, C=O, C-O, and C-H respectively confirming functional groups involved in the synthesis and capping process. The antibacterial activity of the M-CuNPs coated finished leather was evaluated against Grampositive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria, which are common pathogenic species that effect the preservation capabilities of the leather. The M-CuNPs coated finished leather exhibits strong antimicrobial activity against both Gram-positive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria. Hence from the above study, M-CuNPs can be used as a sustainable antibacterial agent for preserving leather and its products. Note de contenu : - MATERIALS AND METHOD : Materials - Preparation of tannin extraction - Synthesis of M-CuNPs - Characteristics of M-CuNPs - Methodology of leather nanocoatings - Antibacteial assay of M-CuNPs - Effect of copper nanoparticles on growth of bacteria - Antibacterial evaluation of M-CuNPs coated leather
- RESULTS AND DISCUSSION : Antibacterial activity of M-CuNPs - Antibacterial mechanism of copper nanoparticles
- Table 1 : Resin finish formulation
- Table 2 : Antibacterial activity of the synthesized M-CuNPsDOI : https://doi.org/10.34314/jalca.v119i2.8322 En ligne : https://drive.google.com/file/d/1Sj4vOJh9ztiOGhfz1DgCXCot8I0WENEA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40465
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Code-barres Cote Support Localisation Section Disponibilité 24447 - Périodique Bibliothèque principale Documentaires Sorti jusqu'au 14/05/2024 Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
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Titre : Sustainable finished leather preservation : Part II - Wattle tannin capped copper nanoparticles Type de document : texte imprimé Auteurs : Ruby Shekinah, Auteur ; Saranya Kailasam, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants
Antibactériens
Caractérisation
Cuirs et peaux -- Conservation
Cuivre
Extraction (chimie)
Nanoparticules -- Synthèse
Produits de conservation du cuir
Tanins végétauxIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Part 1 of the current paper described the green synthesis of myrobalan capped copper nanoparticles for the preservation of the finished leather. In Part II of the current study, Copper Nanoparticles (CuNPs) were synthesized using green synthesis with wattle (tannin) extract as a reducing agent. Green synthesis is the preferred approach for the synthesis of metal nanoparticles due to its eco-friendly and cost-effectiveness for the preservation of finished leather. To improve the antibacterial qualities of leather with different types of finishes, the resin finished leather was coated with synthesized wattle copper nanoparticles (W-CuNPs). The chemical constituents of wattle induce the reduction of Cu2+ ions to CuNPs with the capping process and also remain as a stabilizing agent for the capping process. The formation of W-CuNPs was confirmed by UV-Spectroscopy at an absorbance of 467 nm. The identified functional groups such as -OH, C=C, and C-N were analyzed by Fourier transform infrared spectrum (FT-IR) which are responsible for the reduction and stabilization of copper nanoparticles. The spherical shape of the nanoparticles was ascertained by Scanning Electron Microscope (SEM), whereas Energy dispersive X-ray (EDX) studies confirmed the presence of copper with 65%. The average particle size of W-CuNPs was found to be 96 nm. The zeta potential value of -24 mv affirmed the stability of the W-CuNPs. The maximum zone of inhibition was 12 mm against Gram-positive (Bacillus subtilis) and 11 mm against Gram-negative (Serratia marcescens) bacteria on W-CuNPs coated finished leather, which exhibits strong antimicrobial activity. Hence, CuNPs synthesized by wattle extract have the potential to preserve the finished leather and its products as an antibacterial agent. Note de contenu : - MATERIALS AND METHODS : Preparation of tannin extraction - Synthesis of W-CuNPs - Characterization of W-CuNPs - Methodology of leather nanocoatings - Antibacterial assay of W-CuNPs and W-CuNPs coated leather - Effect of copper nanoparticles on growth of bacteria
- RESULTS AND DISCUSSION : UV-visible spectroscopy of w-CuNPs - Particle size distribution of W-CuNPs - Functional group analysis of W-CuNPs - Morphology and size of W-CuNPs - Antibacterial activity of W-CuNPs
- Table 1 : Antibacterial activity of the synthesized W-CuNPsDOI : https://doi.org/10.34314/jalca.v119i2.8323 En ligne : https://drive.google.com/file/d/1HvhiGDIyGSW4y29rKyK9k40TsJzHnT_O/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40466
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Code-barres Cote Support Localisation Section Disponibilité 24447 - Périodique Bibliothèque principale Documentaires Sorti jusqu'au 14/05/2024 Reduction of Cr (VI) formation in leather with herbal extracts / Roza Mirzamuratova in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
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Titre : Reduction of Cr (VI) formation in leather with herbal extracts Type de document : texte imprimé Auteurs : Roza Mirzamuratova, Auteur ; Eser Eke Bayramoglu, Auteur ; Gulzinat Yeldiyar, Auteur Année de publication : 2024 Article en page(s) : p. 71-79 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Cuirs et peaux -- Finition
Essais accélérés (technologie)
Extraction (chimie)
Extraits de plantes
Réduction (chimie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study investigates the effects of extracts from natural products such as oak bark, and onion peel, on the formation of Hexavalent Chromium (chromium (VI)) or (Cr (VI)) in leather during the finishing process. To enable chromium (VI) formation, finished leather samples were aged under various conditions, including exposure to UV light. The amount of chromium (VI) in each leather sample was measured using a PC UV-Visible spectrophotometer at 540 nm based on the ISO/FDIS 17075 standard method. The results showed that extracts from Quercus cortex, and Allium cepa significantly reduced chromium (VI) formation in the leather under all aging conditions. Note de contenu : - Materials and methods : Extraction process - Processes with plant extracts - Aging process - Chromium (VI) analysis on leather samples - Statistical evaluation
- Table 1 : The recipe for leathers
- Table 2 : The plants used in the study and picking regions
- Table 3 : Recipe for finishing process
- Table 4 : Chromium (VI) content of leather samples after aging process (80°C, 24h)
- Table 5 : Evaluation of chromium (VI) analysis measurements (80°C, 24h)
- Table 6 : Chromium (VI) content of leather samples after aging process by UV(80°C/UV, 24h)
- Table 7 : Evaluation of chromium (VI) analysis measurements(80 °C/UV, 24h)
- Table 8 : Chromium(VI) content of leather samples after aging process (80°C/UV, 72h)
- Table 9 : Evaluation of chromium (VI) analysis measurements(80°C/UV, 72h)DOI : https://doi.org/10.34314/jalca.v119i2.8324 En ligne : https://drive.google.com/file/d/1hABHJ7JxIDEPPuXBNoG8y3q9F8qLZZWz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40467
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Code-barres Cote Support Localisation Section Disponibilité 24447 - Périodique Bibliothèque principale Documentaires Sorti jusqu'au 14/05/2024 Eco-friendly chrome tanning of leather using ultrasound technique / Mohamed Abu Sayid Mia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
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Titre : Eco-friendly chrome tanning of leather using ultrasound technique Type de document : texte imprimé Auteurs : Mohamed Abu Sayid Mia, Auteur ; Shamima Yeasmin, Auteur ; Mohammad Nurnabi, Auteur ; Mohamed Zahangir Alam, Auteur Année de publication : 2024 Article en page(s) : p. 80-90 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Caractérisation
Cuirs et peaux de bovins
Tannage au chrome
UltrasonsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This article describes the development of an environmentally friendly chrome tanning process of leather using ultrasound. Most of the leathers are tanned by the conventional method using basic chromium sulfate. It is one of the most polluting and time-consuming steps in leather processing. Investigations were carried out on ultrasound assisted eco-friendly tanning process so that the chrome tanning agent could provide better quality leather. Effects of using ultrasound in chrome tanning process were studied at different pH, tanning time, tanning agent dosage, and then compared with that of conventional method. Tanned leathers were characterized by scanning electron microscopy (SEM), photomicrographic analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and energy dispersive X-ray (EDX). SEM analyses of the surface and cross-section of the tanned leather showed that fiber structures were not affected by ultrasound. It was also found that the shrinkage temperature of leather tanned with ultrasound was increased by about 5-29 °C. Chrome uptake and content were found to increase by 30-50% and 1-7%, respectively. Tanning time was shortened from 6 hours to 2 hours and the quantity of leachable chromium in ultrasound assisted chrome tanned leather was also decreased significantly. The noteworthy enhancing effects have been attributed largely because of the increased penetration of tanning agents into pickled leather. Photomicrographic analysis of the cross-section of the tanned leather also showed a higher penetration of tanning agents in presence of ultrasound. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Tanning procedure of cow pickled pelt -
- Table 1 : Details of chrome tanning operation - Characterization of tanned leather - UV-visible spectrophotometry - Boiling test - Toxicity characteristic leaching procedure (TCLP)
- RESULTS AND DISCUSSION : Effect of ultrasound on percent chromium uptake of leather - Effect of time on chromium uptake - Chromium content in the tanned leather - Thermogravimetric analysis of tanned leather - Differential scanning calorimetric analysis of tanned leather - Boiling test of tanned leather - Field emission scanning electron microscopic (FESEM) analysis - Diffusion of tanning agent - Determination of leachable chromium content - Estimation of environmental benefits
- Table 1 : Details of chrome tanning operation
- Table 2 : Percentage of area loss of chrome tanned leather by boiling test
- Table 3 : Leachable chromium of tanned leather
- Table 4 : Amount of chromium present in the spent tanning liquorDOI : https://doi.org/10.34314/jalca.v119i2.8325 En ligne : https://drive.google.com/file/d/147dBUkJ8K0JJW0dvpb0wkO3ZNt_peH0W/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40468
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Code-barres Cote Support Localisation Section Disponibilité 24447 - Périodique Bibliothèque principale Documentaires Sorti jusqu'au 14/05/2024 Tambaqui (Colossoma macropomum) leather tanning : a study on the influence of skin morphology on the physical-mechanical properties of leather / Jessica Valéria Campos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
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Titre : Tambaqui (Colossoma macropomum) leather tanning : a study on the influence of skin morphology on the physical-mechanical properties of leather Type de document : texte imprimé Auteurs : Jessica Valéria Campos, Auteur ; Fernanda Ramalho Procopio, Auteur ; Waldomiro Barioni Júnior, Auteur ; Ana Rita de Araujo Nogueira, Auteur Année de publication : 2024 Article en page(s) : p. 91-100 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de Poissons
Essais de résilience
Essais dynamiques
Peau -- Anatomie et histologie
Prétannage
Retannage
Statistique
TannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The fish production chain presents losses of up to 35%, generating a large amount of waste. Using these residues to produce valueadded materials boost fish production towards a sustainable path. The use of fish skin to obtain leather is increasingly attracting the market for fashion and luxury products. Besides considered an exotic material with a unique design, fish leather also has good mechanical properties. Due to the morphology of fish skin, different mechanical responses can be observed, depending on the leather cutting direction. However, there are no specific technical standards for sampling this material. In this scenario, 45 Tambaqui skins were tanned with chromium associated with oxazolidine, and the mechanical properties of the leather were evaluated in four cutting directions: parallel, perpendicular, dorsal-ventral and ventral-dorsal, all concerning the cephalocaudal line of the fish. Skin and leather micrographs revealed layers of parallel collagen fiber bundles distributed in superimposed layers oriented obliquely to the preceding one. Insertions of collagen fibers perpendicular to the leather surface were also observed, joining the deeper layers to the superficial layers. Tensile strength (TS) and elongation (E) results indicated statistical differences, with higher TS results for the perpendicular cut and greater elongation for the parallel cut. The tear strength was higher for the ventral-dorsal cut, statistically differing from the parallel cut. The data indicate that the cutting direction of the specimen can influence the physical-mechanical behavior of the leather, reinforcing the importance of standardization for the qualitative evaluation of fish leather. Note de contenu : - MATERIAL AND METHODS : Material - Methods : Fish skin composition - Histological analysis of Tambaqui skin - Tanning process - Tambaqui leather scanning electron microscopy (SEM) analysis - Tensile and tear strength tests - Statistical analysis
- RESULTS AND DISCUSSION : Tambaqui skin composition - Histological analysis of Tambaqui skin - Scanning electron microscopy (SEM) analysis of Tambaqui leather - Tensile and tear strength tests
- Table 1 : Pre-tanning process conditions of Tambaqui skin
- Table 2 : Tanning process conditions of Tambaqui skin
- Table 3 : Retanning and finishing process conditions of Tambaqui leatherDOI : https://doi.org/10.34314/jalca.v119i2.8326 En ligne : https://drive.google.com/file/d/1GfVdF1NLXOJXyYEPqwuxmpRJ-wmLdA86/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40469
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24447 | - | Périodique | Bibliothèque principale | Documentaires | Sorti jusqu'au 14/05/2024 |