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Development of an alternative low salt bovine hide preservation using PEG and crude glycerol, Part II / Mila Aldema-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 5 (05/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 5 (05/2015) . - p. 125-129 Titre : Development of an alternative low salt bovine hide preservation using PEG and crude glycerol, Part II : Mechanical properties of leather products Type de document : texte imprimé Auteurs : Mila Aldema-Ramos, Auteur ; Zerlina E. Muir, Auteur ; Joseph Uknalis, Auteur ; Joseph Trusello, Auteur Année de publication : 2015 Article en page(s) : p. 125-129 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de sodium -- Suppression ou remplacement 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 -- Analyse Cuirs et peaux -- Conservation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Séchage Polyéthylène glycol Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : To obtain good quality leather products, the hides from which they are derived should be preserved properly while in storage and transit to prevent putrefaction. Current practice for hide preservation is salt curing via concentrated NaCl solutions. The objective of the current study is to develop alternative brining processes that require lesser amounts of salt and have no adverse effect on the resulting leather products. By incorporating a dehydrating agent such as polyethylene glycol polymers (PEG), only a fraction of the commonly used amount of salt is necessary (from about 50% to less than a 25% of the weight of raw hide) to generate an efficiently preserved hide. The scanning electron microscopic (SEM) images and mechanical properties of the resulting crust leather products were comparable to the control obtained from traditionally preserved hides. To compensate for the potential over drying and formation of very tight grain, a humectant such as glycerol (with sodium carbonate) was also included. The rehydration of the test preserved hides is completed in a shorter period of time because the amount of salt in the hides is already quite low. Considering the low cost in obtaining the crude glycerol and its positive effects on quality of leather, it is quite desirable as an ingredient in the new alternative less salt hide preservation. Note de contenu : - EXPERIMENTAL : Materials - Laboratory scale protocol for the alternative hide preservation - Chloride content determination - Tanning of cured hide pieces - Mechanical properties of the crust leather product - Scanning electron microscopy - RESULTS AND DISCUSSION : Dehydration trends - Chloride content - Mechanical properties - Scanning electron microscopy of crust leather En ligne : https://drive.google.com/file/d/1p5EJIlK-GBoZiZ1RQkNCpDiVmroe4BCc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24052 [article]

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Carbon footprint and toxicity indicators of alternative chromium-free tanning in China / Xiaoying Xu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 5 (05/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 5 (05/2015) . - p. 130-137 Titre : Carbon footprint and toxicity indicators of alternative chromium-free tanning in China Type de document : texte imprimé Auteurs : Xiaoying Xu, Auteur ; Grau Baquero, Auteur ; Rita Puig, Auteur ; Jiabo Shi, Auteur ; Sang Jun, Auteur ; Wei Lin, Auteur Année de publication : 2015 Article en page(s) : p. 130-137 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bilan des émissions de gaz à effets de serre Durée de vie (Ingénierie) Énergie -- Consommation Environnement -- Etudes d'impact Tannage -- Aspect de l'environnement Toxicologie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This paper analyzes, from a life cycle perspective, the environmental performance of a newly developed chromium-free tanning process compared to the conventional one, in China. Both processes were evaluated by using carbon footprint, energy consumption and toxicity indicators. Chromium-free tanning process has been found to significantly reduce the considered impact categories compared to conventional tanning. The impact contribution of each process step was calculated, with the tanning step being the major contributor. Results show that the production of chemicals used in the tanning process, have a significant effect on the impacts evaluated. Some of these chemicals have been substituted with similar ones (used as proxies) when no manufacturing-data was available in the databases. Thus, it is important for future and more precise LCA studies to develop databases on the specific chemicals used. This study is a first estimation of the impacts and will help on the decision of expending time and efforts on developing and optimizing the new technology. The results show that it is interesting to use this LCA methodology to environmentally evaluate new research processes and products, before industrial scaling and implementing them, to optimize research time and efforts towards the most environmentally promising products and processes. Note de contenu : - AIM OF THE STUDY - METHODOLOGY - INVENTORY DATA AND MODELING : Functional unit and system boundaries - Conventional tanning process model and inventory data - Chromium free tanning process model and inventory data - Chinese electrical power grid mix and thermal energy mix - Wastewater treatment - RESULTS AND DISCUSSION : Evaluation of the GWP index - Evaluation of the energy consumption - Evaluation of the toxicological impacts to humans and freshwater - Comparative evaluation of tanning steps En ligne : https://drive.google.com/file/d/10vyeauNiwsjpJ9kr5HmOz6pgSDeKiJ7c/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24053 [article]

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Damage of pickled hides, wet-blue leather and vegetable leather due to biodeterioration / Juliana T. Fontoura in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 5 (05/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 5 (05/2015) . - p. 138-144 Titre : Damage of pickled hides, wet-blue leather and vegetable leather due to biodeterioration Type de document : texte imprimé Auteurs : Juliana T. Fontoura, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2015 Article en page(s) : p. 138-144 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Champignons microscopiques Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Essais dynamiques Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Tannage végétal Traction (mécanique) Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fungi and bacteria can be responsible for undesirable changes in hides and leather. This study identifies some of the defects caused by fungal growth on pickled hides, wet blue leather and vegetable-tanned leather, such as stains, protein material loss, deterioration of grain layer, and modification of the physical and mechanical properties of resistance. The assessment of the samples exposed to microbiological attack was carried out through visual observation, scanning electron microscopy (SEM), tensile strength test and determination of mass loss. Leather without preservation or treated with insufficient of antimicrobial agent to prevent fungal contamination showed changes in the structure, loss of protein material, a reduction in physical and mechanical properties as well as the presence of stains that may compromise the quality of the final product. Note de contenu : - MATERIALS AND METHODS : Sample preparation - Biodeterioration process in soil - Leather tensile strength test - Stains and damage caused by fungal attack - Examination of the infected pickled hides, wet-blue leather and vegetable tanned leather sample by SEM - RESULTS AND DISCUSSION : Biodeterioration process in soil - Leather tensile strength test - Stains and damage caused by the fungal attack En ligne : https://drive.google.com/file/d/1ohbmrwCUXfBX102DlSJn3Fixx84FKxJN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24054 [article]

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A molecular level investigation of dialdehyde starch interaction with collagen for eco-friendly stabilization / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 5 (05/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 5 (05/2015) . - p. 145-151 Titre : A molecular level investigation of dialdehyde starch interaction with collagen for eco-friendly stabilization Type de document : texte imprimé Auteurs : Gladstone Christopher Jayakumar, Auteur ; Swarna Vinodh Kanth, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2015 Article en page(s) : p. 145-151 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidon dialdéhyde Antienzymes Collagène Dynamique moléculaire Réticulation (polymérisation) Stabilisants (chimie) Stabilité thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The current study investigates Dialdehyde Starch (DAS) as a stabilizing agent for collagen. DAS is a well established crosslinking agent for protein; however, molecular interaction with collagen was not elucidated. Dialdehyde involves in the formation of inter and intra crosslinking with protein which renders higher stability against heat and enzyme. Crosslinking efficiency of DAS with collagen was found to increase with increase in the concentration. DAS interacted collagen membrane exhibited an increase in the thermal stability of about 35°C at pH 8. Swelling degree of collage-DAS membranes were found to decrease with increase in the concentration of DAS owing to the shift in the nucleation behavior in collagen fibrillogenesis. DAS treated collagen membrane shows 90% resistance to collagenase due to the unavailability of cleaving sites in collagen-DAS fibres. Reconstittued collage-DAS collagen membranes showed increase in cell proliferation which signifies its non-toxic characteristics. Therefore, DAS can be a new class of green tanning agent for skin stabilization and also finds applications in scaffold preparation. Note de contenu : - MATERIALS AND METHODS : Reagents and chemicals - Preparation of type I collagen - Preparation of reconstituted collagen membranes - Crosslinking conditions - Crosslinking efficiency - Swelling ratio - Thermal resistance of DAS stabilized collagen membrane hydrothermal temperature - Calorimetric measurement - Denaturation temperature - Collagenolytic activity of DAS stabilized collagen matrix - Scanning Electron Microscopy studies of DAS stabilized collagen membrane - In vitro cytotoxicity analysis - RESULTS AND DISCUSSION : Effiency of DAS interaction with biomembrane - TNBS assay - Water absorption in collagen-DAS biomembrane - Thermal stability of collagen-Das biomembrane - DAS-collagen biomembrane resistance against collagenase - Morphological study of collagen-DAS biomembrane - Evaluation of cell proliferation on collagen - DAS biomembrane substrate - Plausible mechanism of dialdehyde starch interaction with collagen En ligne : https://drive.google.com/file/d/1Xdg1FiqhE-W-sP_5lxd2otPh_8Tl6HsR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24055 [article]

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