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A novel approach towards preservation of skins / K. C. Kannan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 11 (11/2010)
[article]
Titre : A novel approach towards preservation of skins Type de document : texte imprimé Auteurs : K. C. Kannan, Auteur ; Marimuthu Pradeep Kumar, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2010 Article en page(s) : p. 360-368 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de sodium Le chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin.
On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na).
Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène.
Cuirs et peaux -- Conservation
Hydroxyproline
Microscopie électronique à balayage
Peaux brutes -- Trempe
Polyéthylène glycolIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Wet salting, the conventional method of curing is followed by most of the tanners because of its practical advantages ; employs approximately 40-50 % sodium chloride on raw material and is subsequently removed during the soaking operation. It contributes to the total solids content of the effluent, accounting for nearly 40 % of the total solids load. Hence an attempt has been made to completely replace the salt with polyethylene glycol (PEG) to address the pollution problems without compromising much of the practical advantages of salt. The molecular weight and percentage offer of PEG has been standardized base on the dehydration and rehydration profile of the preserved skin matrix. The PEG based preservation has been found to be more effective than the conventional method by the determination of hydroxyproline (HP) release in soak liquors during various time periods of storage. The fiber orientation of the crust leather has been demonstrated through scanning electron microscopy analysis. The pollutant loads of the developed preservation method using PEG was found to be 71, 34, 99, 93 % less in terms of biochemical oxygen demand (BOD), chemical oxygen demand (COD), chloride (Cl-), total dissolved solids (TDS), respectively, when compared to the conventional method of preservation. Further, the physical and organoleptic properties of the crust leathers were found to be on par with control crust leathers. Hence, the developed preservation method seems to be a techno-economically viable alternative for salt-based preservation. En ligne : https://drive.google.com/file/d/1aJYztfh89zCnJecP2tVZSVSjX1wEZwF_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10237
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Code-barres Cote Support Localisation Section Disponibilité 012584 - Périodique Bibliothèque principale Documentaires Disponible De-oiled karanja cake as potential bio-aditive for low salt raw skin preservation / V. Brinda in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 5 (05/2020)
[article]
Titre : De-oiled karanja cake as potential bio-aditive for low salt raw skin preservation Type de document : texte imprimé Auteurs : V. Brinda, Auteur ; N. Vedaraman, Auteur ; Victor John Sundar, Auteur ; J. Kangaraj, Auteur ; K. C. Velappan, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2020 Article en page(s) : p. 159-165 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Bains de trempe -- Analyse
Chlorure de sodium -- Suppression ou remplacement
Chromatographie en phase liquide à hautes performances
Concentration minimale bactéricide
Concentration minimale inhibitrice (antimicrobiens)En microbiologie, la concentration minimale inhibitrice (CMI) est la plus faible concentration d'un produit chimique, généralement un médicament, qui empêche la croissance visible d'une ou de plusieurs bactéries. La CMI dépend du micro-organisme considéré, de l'être humain affecté (in vivo uniquement) et de l'antibiotique lui-même.
La CMI est déterminée en préparant des solutions du produit chimique in vitro à diverses concentrations croissantes, en incubant les solutions avec des groupes séparés de bactéries en culture et en mesurant les résultats en utilisant une méthode de dilution standardisée (agar ou microdilution). Les résultats se classent ensuite comme "sensible", "intermédiaire" ou "résistant" à un antimicrobien particulier en utilisant un point d'arrêt. Les points d'arrêt sont des valeurs convenues, publiées dans les directives d'un organisme de référence, comme le US Clinical and Laboratory Standards Institute (CLSI), la British Society for Antimicrobial Chemotherapy (BSAC) ou le Comité européen sur les tests de sensibilité aux antimicrobiens (EUCAST). On a pu constater des écarts importants au niveau des points d'arrêt de divers pays européens au fil des ans, et entre ceux de l'EUCAST et du CLSI.
Alors que la CMI est la concentration la plus faible d'un agent antibactérien nécessaire pour inhiber la croissance visible, la concentration bactéricide minimale (CBM) est la concentration minimale d'un agent antibactérien qui entraîne la mort bactérienne. Plus la CMI est proche de la CBM, plus le composé est bactéricide.
La première étape de la découverte d'un médicament est souvent le dépistage d'un médicament candidat de banque de données pour les CMI contre les bactéries d'intérêt. En tant que tels, les CMI sont généralement le point de départ pour de plus grandes évaluations précliniques de nouveaux agents antimicrobiens. Le but de la mesure de la concentration minimale inhibitrice est de s'assurer que les antibiotiques sont choisis efficacement pour augmenter le succès du traitement. (Wikipedia)
Cuirs et peaux -- Conservation
Cuirs et peaux -- Teneur en eau
Huile de karanja et constituants
Industrie -- Pollution -- Lutte contre
Microscopie électronique à balayageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The most commonly practiced preservation processes for raw hide/skin is by application of common salt (NaCl) due to its wide availability, cost effectiveness and bacteriostatic activity. During the soaking process, the salt present in the skin dissolves in water, thereby generating high total dissolved solids (TDS) levels causing pollution to the environment. Hence, an eco–friendly material without salt or with lower quantities of salt is needed for the preservation of the skin. In this present study Karanja de-oiled cake (Millettia/Pongamia pinnata) extract was studied for its antibacterial activity, minimal inhibitory concentration and minimum bactericidal concentration for preservation. The reverse phase high performance liquid chromatography (RP-HPLC) analysis shows the presence of karanjin (0.2%) and pongamol (0.02%) and these compounds may be responsible for the antibacterial activity against skin deteriorating bacteria. The preservation trials with karanja de-oiled cake 15% along with less salt 15% showed no hair slip, no putrefaction, reduced bacterial load to approximately 35%, compared to control skins at 25º-35ºC for 21 days. The preserved skins on rehydration showed that the soak liquor of experimental skins had a considerable reduction in TDS (about 67%) compared with conventional soak liquor. On processing these skins into leather, the experimental skins were found to possess comparable strength properties (tensile, tear strength) and organoleptic properties as conventional salt-based preserved skins. This study concludes that conventional salt-based preservation of skins can be replaced by an eco-friendly preservation method using karanja de-oiled cake along with less salt. Note de contenu : - MATERIAL AND METHOD : Chemicals - Skin - De-oiled karanja extracts - Isolation and identification of proteolytic bacteria - Antibacterial activity - Minimal Inhibitory Concentration (MIC) and Minimal Bactericidal Count (MBC) - HPLC
- PRESERVATION EXPERIMENTS : Preliminary studies - Lab scale studies - Moisture content - Bacterial load - SEM analysis - Investigation for pollution load in soak liquor - Leather processing
- RESULTS AND DISCUSSION : Physicochemical characterization of leatherDOI : https://doi.org/10.34314/jalca.v115i5.3807 En ligne : https://drive.google.com/file/d/1uVYysIEYThstbXhpavFHk1-saEltSUWg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34161
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Code-barres Cote Support Localisation Section Disponibilité 21742 - Périodique Bibliothèque principale Documentaires Disponible Performance of antimicrobial agents for the preservation of chrome leather / Juliana T. Fontoura in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)
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Titre : Performance of antimicrobial agents for the preservation of chrome leather Type de document : texte imprimé Auteurs : Juliana T. Fontoura, Auteur ; D. Ody, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2016 Article en page(s) : p. 221-229 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Adsorption
Antifongiques
Cuirs et peaux -- Analyse
Cuirs et peaux -- Conservation
Cuirs et peaux -- Lavage
Tests microbiologiques
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fungal growth in leathers causes significant damages like stains, surface roughness and loss of physical-mechanical resistance. This raises the need to develop control strategies by the use of antimicrobial agents. Considering the improving processes with regard to the use of antimicrobial agents added in skins and leathers to prevent their contamination by fungi, this study aims to evaluate the performance of six antimicrobial agents conventionally used in the leather industry, against four different fungi. These agents were applied during the chrome tanning process. Accelerated microbiological assays (tests plating and incubation on tropical chamber) were performed, as well as sorption and wash-out testing of three selected antimicrobial agents by UV/VIS spectrophotometry and verification of surface biodeterioration through SEM. Antimicrobial agents 2-thiocyanomethylthio benzothiazole (TCMTB) and Aqueous dispersion of 2-n-octyl-4-isothiazolin-3-one + methyl Nbenzimidazol- 2-ylcarbamate (OIT+BMC/water) showed antifungal capacity against different fungi tested applied in concentration of 0.2% (weight leather base). In the tropical chamber test, for the five samples of wet-blue leather treated with antimicrobial agents the growth of fungus was not observed. From the antimicrobial agents subjected to sorption testing and wash out, the TCMTB based antimicrobial agent presented rapid and high sorption in wet blue leather and also has resistance to washing. Note de contenu : - MATERIALS AND METHODS : Materials and application of antimicrobial agents to leather - Plating test - Incubation in a tropical chamber - Sorption and wash out - Scanning electron microscope images
- RESULTS AND DISCUSSION : Plating test - Incubation in a tropical chamber - Sorption and wash out - Scanning electron microscope studiesEn ligne : https://drive.google.com/file/d/1wr6V_36Odg8tKYVy7fxXCr8ixeXIZkYH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26439
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Code-barres Cote Support Localisation Section Disponibilité 18139 - Périodique Bibliothèque principale Documentaires Disponible Performance of sulfonated dimeric malenised soya fatty acid as a leather fatliquor / R. Janardhanan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 4 (04/2012)
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Titre : Performance of sulfonated dimeric malenised soya fatty acid as a leather fatliquor Type de document : texte imprimé Auteurs : R. Janardhanan, Auteur ; V. Vijayabaskar, Auteur ; B. S. R. Reddy, Auteur Année de publication : 2012 Article en page(s) : p. 128-136 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides gras
Cuirs et peaux -- Conservation
Dimères
Energie de surface
Huile de soja
Potentiel zeta
Sulfoniques, Acides
SurfactantsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A change of molecular structure improves the surface active efficiency of new generation gemini surfactants. As a result, it was confirmed that the dosage could be reduced considerably in industrial applications as performance chemicals, leading to economically quantifiable benefits. The performance of newly synthesized gemini surfactant based sulfonated dimeric malenised soya fatty acid bridged with butane diol was evaluated as a leather fatliquor. The chemical parameters of the fatliquors were analysed and tested on leather. The properties imparted by the fatliquor to leather were studied qualitatively and quantitatively. SEM studies of the treated leathers revealed better penetration of the gemini surfactant based fatliquor compared to the control. Results were correlated in terms of emulsification power, zeta potential and particle size of the surfactants, found to be better than the conventional surfactant. The surface energy was calculated for the fatliquors and found to be equal. Note de contenu : - MATERIALS AND METHODS : Formulation of fatliquors - Synthesis of sulphonated gemini surfactants
- RESULTS AND DISCUSSION : Chemical analyses of FL R, FL 1 and FL 2 fatliquors - Leather properties
- TABLE I : Leather fatliquor process - Zeta potential - Surface energy - Particle size
- TABLE II : Organoleptic properties of FL 1/FLR and FL 2/FLR
- TABLE III : Physical testing results of FL 1/FLR and FL 2/FLR
- TABLE IV : Emulsification power of surfactantsEn ligne : https://drive.google.com/file/d/1Ob8iE3Nbow8V7itSIGGo6-CwBWMiqkjs/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14687
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Code-barres Cote Support Localisation Section Disponibilité 13874 - Périodique Bibliothèque principale Documentaires Disponible Polyethylene glycol as a preservative for pigskin and its interaction with collagen / Chunhua Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
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Titre : Polyethylene glycol as a preservative for pigskin and its interaction with collagen Type de document : texte imprimé Auteurs : Chunhua Wang, Auteur ; Huijuan Peng, Auteur ; Jun Sang ; Wei Lin Année de publication : 2018 Article en page(s) : p. 326-334 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Collagène
Cuirs et peaux -- Conservation
Cuirs et peaux de porcs
Fourier, Spectroscopie infrarouge à transformée de
Microscopie à force atomique
Poids moléculaires
Polyéthylène glycol
Potentiel zeta
Solutions de polymèreIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Herein, an immersing method for the pigskin preservation by using polyethylene glycol (PEG) with different molecular weights (Mw = 200, 600, 6000) was developed and the influence of PEG on the conformation of type I collagen was investigated. Only PEG200 followed dehydration and rehydration patterns similar to that of salt curing and exhibits reasonably good preservative and bloodstains removal effects. Zeta potential analyses show that the collagen-PEG solutions have good dispersions stability. FT-IR and US-DSC results indicate that collagen triple helixes are kept integrated in the presence of PEG, and the highly hydrated feature of PEG helps to maintain the stability of the protein conformation. Atomic Force Microscope (AFM) images show that the collagen fibrils become more dispersed with the increasing Mw of PEG. The present work gives positive insight to partially replacing sodium chloride for the preservation of raw hide and skin, as well as the development of PEG-collagen biomaterials. Note de contenu : - EXPERIMENTAL : Materials - Preservation test with PEG - Inhibition zone test of PEG - Preparation of PEG-collagen samples - Zeta potential measurement - Fourier transform infrared spectroscopy (FT-IR) measurement - Ultra-sensitive differential scanning calorimeter (US-DSC) - Atomic force microscope (AFM) observation En ligne : https://drive.google.com/file/d/1LRY2hiHjLp_KYBqpszPrrHZyBO1vHOjE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31092
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Code-barres Cote Support Localisation Section Disponibilité 20280 - Périodique Bibliothèque principale Documentaires Disponible A practical alternative to salt for the preservation of hides and skins in WORLD LEATHER, Vol. 18, N° 3 (05/2005)
PermalinkPréconservation et amélioration de la conservation des peaux brutes / J. Prévot in TECHNICUIR, N° 8 (10/1975)
PermalinkLa préservation à court terme des peaux / Desmond R. Cooper in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXVI (Année 1974)
PermalinkPreservation of bovine hide using less salt with low concentration of antiseptic, Part I : effectiveness of developed formulations / Majher I. Sarker in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)
PermalinkPreservation of bovine hide using less salt with low concentration of antiseptic, Part II : Impact of developed formulations on leather quality and the environment / Majher I. Sarker in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
PermalinkPreservation of cattlehides with electron beam irradiation / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
PermalinkPreservation of goatskin using tamarindus indica leaf extract - Green process approach / A. Tamil Selvi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)
PermalinkPreservation of hides with sulfite. I. Concentration and application effects on small-scale experiments with cattlehides / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
PermalinkPreservation of hides with sulfite. II. A matched side comparison of leathers from hides preserved with sodium sulfite or brine curing / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
PermalinkPrevention of halophilic microbial damage on brine cured hide by extremely halophilic halocin producer strains / Meral Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 3 (05-06/2004)
PermalinkProtection technology : a new fungicide concept / Katia Padoan in LEATHER INTERNATIONAL, Vol. 213, N° 4811 (06/2011)
PermalinkQualité du cuir obtenu à partir de peaux brutes n'ayant pas subi de traitement de conservation / Wiktor Pietrzykowski in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXIV (Année 1972)
PermalinkPermalinkRecovery, purification and reuse of contaminated sodium chloride obtained from tanneries for raw goat skin preservation / N. Vedaraman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 2 (02/2016)
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