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Enzymatic bacterial dehairing of bovine hide by a locally isolated strain of bacillus Licheniformis / E. H. A. Nashy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 6 (11-12/2005)
[article]
Titre : Enzymatic bacterial dehairing of bovine hide by a locally isolated strain of bacillus Licheniformis Type de document : texte imprimé Auteurs : E. H. A. Nashy, Auteur ; S. A. Ismail, Auteur ; A. M. Ahmady, Auteur ; H. El-Fadaly, Auteur ; N. H. El-Sayed, Auteur Année de publication : 2005 Article en page(s) : p. 242-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bacillus licheniformis
Bactéries -- Identification
Caractérisation
Cuirs et peaux de bovins
Epilage enzymatiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bacterial isolation and identification were realized for microbial enzymatic dehairing of animal skin. The process was optimized for the required skin quality taking into account the contact time, temperature, pH, crude enzyme concentration (%) as well as mechanical agitation. Scanning electron microscopy (SEM) was used to show the effect of bacterial enzyme on the grain surface and fibres in comparison with the chemical unhairing considering the quality of the skin.
The optimization of keratinase activity was also examined. The bacterial isolates were identified as Bacillus licheniformis, (coded as D-10). The experimental results showed that the contact time of 48hr at 35°C, pH8.7, crude enzymatic concentration (v/v) 6% and shaking at 100 rev. min-1 are optimal for enzymatic dehairing of animal hide. The results obtained and the SEM results indicate the possibility of using bacterial enzymes to dehair animal skin instead of using chemical compounds, to assure good skin quality, protecting the environment and saving time.Note de contenu : - MATERIALS AND METHODS : Growth Conditions - Isolation and Identification of Proteolytic Bacteria - Preparation of standard inoculum and enzyme production - Enzyme Assay - Enzymatic dehairing by selected Bacillus licheniformis - Dehairing of skin by Na2S/Lime
- RESULTS AND DISCUSSION : Screening and Selection of the most potent isolate for animal skin dehairing - Identification of the selected potent isolate
- CONCLUSION : Bacterial enzyme/sulphide comparison - Characterization of the enzymatic reaction conditions
- Table 1 : Shape and proteolytic potency of the bacterial isolates at 37°C for 48 hours and their effect on animal skin
- Table 2 : Morphological and biochemical characteristics of bacterial isolate active in animal skin dehairing
- Table 3 : Factors affecting on animal skin dehairing by enzymeEn ligne : https://drive.google.com/file/d/1DHdolEkyxA7dBoVPYRDyLUKv1yvT860f/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39214
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 6 (11-12/2005) . - p. 242-249[article]Novel retanning agents for chrome tanned leather based on emulsion - Nano particles of styrene/butyl acrylate co-polymers / E. H. A. Nashy in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 9 (09/2011)
[article]
Titre : Novel retanning agents for chrome tanned leather based on emulsion - Nano particles of styrene/butyl acrylate co-polymers Type de document : texte imprimé Auteurs : E. H. A. Nashy, Auteur ; A. I. Hussein, Auteur ; M. M. Essa, Auteur Année de publication : 2011 Article en page(s) : p. 241-248 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère styrène acrylate de butyle
Copolymères en émulsion
Cuirs et peaux
Microscopie électronique à balayage
Microscopie électronique en transmission
Nanoparticules
Retannage
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The retanning process is a very important step in the leather manufacturing because it overcomes some of the disadvantages of chrome tannage. For this purpose, two different nano-emulsions of styrene/acylate copolymers were prepared using seed emulsion polymerization technique. The main difference and characteristics of the two copolymer emulsions were studied. In addition, the morphology and the nano-particle size of the copolymer emulsions was proved by transmission electron microscope (TEM). The influence of the prepared copolymer emulsions as retanning agents for chrome tanned leather was also studied. The physico-mechanical properties of the retanned leather, namely, tensile strength, elongation at break and tear strength, were measured. Thermal stability and texture of grain surface and fibers of chrome tanned leather were ewamined using thermal gravimetric analysis (TGA) and scanning electron microscope (SEM), respectively. All these parameters were the main target of this work and used to evaluate the applicability of the copolymers as efficient retanning agents. The results showed an improvement in the physico-mechanical properties, softness, and firmness of grain as well enhancement in thermal stability upon retanning by the prepared copolymer emulsions. Note de contenu : MATERIALS AND TECHNIQUES : Raw materials - Pre-emulsion - Seeded emulsion polymerization - Leather samples preparation - a-Neutralization process - b- Retanning process - c- Dying process - Tranmission electron microscope (TEM) examination - Mechanical properties - Stitch tear (single hole) - Color measurements - Thermal analysis - Scanning electron microscope (SEM) examination
- RESULTS AND DISCUSSION : Characterization of the prepared copolymer latexes - Mechanical properties - Colour measurements - Thermal stability study (TGA) - Scanning electron microscope (SEM)En ligne : https://drive.google.com/file/d/1OGqVJqLPbUolrofwx9alMc0W8sn67_xk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11885
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 9 (09/2011) . - p. 241-248[article]Réservation
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