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Antibacterial activity of sophorolipids produced by Candida bombicola on Gram-positive and Gram-negative bacteria isolated from salted hides / Daniel K. Y. Solaiman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 10 (10/2016) . - p. 358-364 Titre : Antibacterial activity of sophorolipids produced by Candida bombicola on Gram-positive and Gram-negative bacteria isolated from salted hides Type de document : texte imprimé Auteurs : Daniel K. Y. Solaiman, Auteur ; Richard Ashby, Auteur ; Meral Birbir, Auteur ; Pinar Caglayan, Auteur Année de publication : 2016 Article en page(s) : p. 358-364 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Bactéries à gram négatif Bactéries à gram positif Candida Cuirs et peaux -- Conservation Glycolipides Sophorolipides Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salted hides and soaked hides treated with certain antibacterial agents, may still contain different proteolytic and lipolytic Gram-positive and Gram-negative bacteria that affect the quality of leather adversely. The prevalence of bacteria resistant to antimicrobial agents in the leather industry has drawn attention of scientists to search new and effective antimicrobial agents. Examination of antimicrobial glycolipids such as sophorolipids for their effectiveness against proteolytic and lipolytic hide-degrading microorganisms, may offer important information. Hence, we describe a research that evaluates the susceptibility of various hide-degrading bacteria to sophorolipids. These extracellular glycolipids were produced by fermentation using Candida bombicola ATCC 22214. Palmitic acid, stearic acid, and oleic acid were used respectively to produce SL-p, SL-s, and SL-o. The minimal inhibitory concentrations (MICs) of SL-p, SL-s, and SL-o against Gram-positive endospore-forming bacteria (Bacillus licheniformis, B. pumilus and B. mycoides), Gram-positive bacteria (Enterococcus faecium, Aerococcus viridans, Staphylococcus xylosus, S. cohnii and S. equorum), Gram-negative bacteria (Pseudomonas luteola, Enterobacter cloacae, E. sakazakii and Vibrio fluvialis), and mixed culture of these isolates were examined using an agar dilution method. The MICs of both SL-p and SL-o against the test bacteria were determined as 19.5 µg/mL, with an exception that E. cloacae was inhibited by SL-o at a MIC of 9.76 µg/mL. Although MICs of SL-p did not change against the test bacteria, the MICs of SL-s (ranging from 4.88 µg/mL to 19.5 µg/mL) changed according to species of the test bacteria. The lowest MICs of SL-s were found to be 4.88 µg/mL against B. licheniformis, B. pumilus, P. luteola, S. xylosus and B. mycoides. The MICs of SL-p, SL-s, and SL-o against the mixed bacterial culture were detected as the same (19.5 µg/mL). In conclusion, SL-p, SL-s, and SL-o inhibited the growth of 12 different hide bacteria and their mixed culture, and have broad-spectrum activity. The results obtained in the present study may be valuable for the development of SL-p, SL-s, and SL-o as antimicrobial surfactants in the preservation and soaking processes of hides and skins. Note de contenu : - Test microorganisms - Production of sophorolipids - Agar dilution method En ligne : https://drive.google.com/file/d/1_1T2en2bjAvf3Fync8UPQ5O5QWMSRfdx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27021 [article]

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Modified smart collagen biomaterials for pharmacy and adhesive applications / Ján Matyasovsky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 10 (10/2016) . - p. 365-375 Titre : Modified smart collagen biomaterials for pharmacy and adhesive applications Type de document : texte imprimé Auteurs : Ján Matyasovsky, Auteur ; Ján Sedliacik, Auteur ; Igor Novák, Auteur ; Peter Simon, Auteur ; Peter Jurkovic, Auteur ; Peter Duchovic, Auteur ; Angela Kleinová, Auteur Année de publication : 2016 Article en page(s) : p. 365-375 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux Biopolymères Collagène Colles:Adhésifs Comprimés Préparations pharmaceutiques Technique des plasmas Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen has widespread use for preparation of cell cultures, dermal cosmetics, food and medicines, while achieving biocompatibility with the biological environment. Unmodified native collagen is relatively difficult to process for intended applications. This work presents potential application possibilities of modified collagen biopolymer for pharmacy and adhesive applications. Firstly, the application possibilities of collagen in the system of controlled drug release were verified. Dissolution profile of the matrix Ambroxol hydrochloride and Venlafaxine confirmed potential of crosslinked and plasticized collagen as a pharmaceutical agent for the solid medicinal product. This product was prepared by direct compression with controlled drug release within the 8-11 hours with almost zero-order kinetics. Secondly, low temperature plasma was applied to achieve the biocompatibility and to modify the film surface of the collagen type I. Collagen film was treated in two plasma environments ; low temperature plasma N2/H2 was used for grafting the amino groups and CO2 plasma ensured grafting the carboxyl groups. The surface functional groups of collagen were applied in further reactions (e.g., antimicrobial pretreatment with strong biocide properties). Functionalized collagen film provided stronger adhesion and compatibility. Prepared non-formaldehyde collagen thermoplastic adhesive was tested for the technical applications. The results have shown that the collagen adhesive bond gained high strength, flexibility and required strong gluing, e.g. books or wood veneered materials. Note de contenu : - EXPERIMENTAL : Materials and methods - Used drug and excipient : Ambroxol hydrochloride - Venlafaxine hydrochloride - Collagen BS - Collagen HS - Collagen K 12 - Ethylene vinyl acetate - Methocel - Measurement methods : Tablet pressing - Mechanical testing of tablets - Disintegration of tablets - Dissolution of tablets - Surface and adhesion properties of EVAc films with collagen - Plasma modification - ATR-FTIR spectroscopy measurements - Plywood preparation - RESULTS AND DISCUSSION : Application of modified collagen in pharmacy - Non-crosslinked collagen hydrolysate as the tablet binder - Tests of controlled release of ambroxol from the tablet matrix - Surface and adhesion properties of the film sample with collagen - Surface and adhesion properties of collagen based thermoplastic hot-melt films - Determination of the bond quality of plywood boards with collagen films En ligne : https://drive.google.com/file/d/1rpwqGlXtr2bK6lN5uetRB1sMM9yjke9u/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27022 [article]

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An experimental comparative study on silicone oil and polyethylene glycol as dry leather treatments / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 10 (10/2016) . - p. 377-382 Titre : An experimental comparative study on silicone oil and polyethylene glycol as dry leather treatments Type de document : texte imprimé Auteurs : Alireza Koochakzaei, Auteur ; Hossein Ahmadi, Auteur ; Mohsen Mohammadi Achachluei, Auteur Année de publication : 2016 Article en page(s) : p. 377-382 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs Antioxydants Colorimétrie Cuirs et peaux -- Conservation Cuirs et peaux -- Propriétés mécaniques Essais accélérés (technologie) Huile de silicone pH -- Mesure Polyéthylène glycol Produits de nourriture du cuir Température de retrait Vitamine C Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The application of leather dressing and lubricants is one of the important challenges in conservation of historic dry leathers, due to their effects on structural and visual properties and stability of leathers. This study aimed to investigate influence and stability of silicone oil and polyethylene glycol (PEG) on treated dry leathers, and application assessment of ascorbic acid (AA) as an antioxidant additive for PEG. The polymers, untreated and treated leather samples were submitted to heat accelerated ageing process. FTIR spectroscopy, colorimetry, pH measurements, investigation of mechanical properties and shrinkage temperature (Ts) were used to explain effect of treatments. Also, the oxidation of polymers during ageing process was monitored by FTIR spectroscopy. Results showed that silicone oil has better stability against thermal oxidation with compared to PEG. Ascorbic acid inhibited the PEG oxidation. Moreover, results revealed that the silicone oil has a better performance in treatment of dry leather than PEG or PEG+AA, due to its high stability and minimum changes in visual, structural and mechanical properties in treated leathers. Note de contenu : - Accelerated aging of lubricants - Leather treatment and accelerated aging - Colorimetry - pH measurement - ATR-FTIR spectroscopy - Shrinkage temperature - Mechanical properties En ligne : https://drive.google.com/file/d/1kaMnDuI0gNV2r8Ix-H-sN-35-0UAjvN1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27027 [article]

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Dyeing of chamois leather using water soluble sulphure dyes / A. Jaya Prakash in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 10 (10/2016) . - p. 383-389 Titre : Dyeing of chamois leather using water soluble sulphure dyes Type de document : texte imprimé Auteurs : A. Jaya Prakash, Auteur ; Rathinam Aravindhan, Auteur ; N. Nishad Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2016 Article en page(s) : p. 383-389 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants Colorimétrie Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Teinture Cuirs et peaux de Chamois Humidité -- Absorption:Eau -- Absorption pH Résistance à l'abrasion Solidité de la couleur Soufre Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chamois leathers find application in fuel filtration and cleaning. Recently, use of chamois leathers is explored in the development of sports garments, gloves and other personal wear. However, one of the consumer demand viz. different colors on the end product is not met by chamois leathers. Hence, dyeing is essential to make it more attractive for end user applications. In the present work an attempt has been made to develop colored chamois leather by employing water soluble sulphur dyes. The offer of sulphur dyes have been optimized based on dyeing characteristics, color fastness and color values. The results indicate that offer of 1 and 2% of the dyes show better colour value and fastness to rubbing. Hence, it could be inferred that coloring of chamois leathers not only improved the aesthetic appeal but also helped in adding value without altering inherent properties of chamois leather. Note de contenu : - EXPERIMENTAL SECTION : Materials - Methods : Dyeing of chamois leather - Color measurement of chamois leathers - Color fastness analysis - Water absorption - Organoleptic - RESULTS AND DISCUSSION : Dyeing of leather matrix - Reaction mechanism and effect of pH - Stability of dye solution towards acid, alkali and hard water - Color measurement of chamois leather - Color fastness - Water absorption - Evaluation of organoleptic properties En ligne : https://drive.google.com/file/d/1qxWDPiimzVoIWkafnFc4jR84urkRyfXC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27032 [article]

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