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Analyzing the mechanism and effect of acid protease in wet blue bating process for leather production / Hao Li in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)
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Titre : Analyzing the mechanism and effect of acid protease in wet blue bating process for leather production Type de document : texte imprimé Auteurs : Hao Li, Auteur ; Jinzhi Song, Auteur ; Deyi Zhu, Auteur ; Yanchun Li, Auteur ; Shan Cao, Auteur ; Jing Xiao, Auteur Année de publication : 2020 Article en page(s) : p. 10-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation
Chrome
Collagène -- Détérioration
ConfitageLe confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Propriétés physiques
DesmosineLa desmosine est une structure moléculaire formée par l'association de quatre chaînes latérales de lysine. On la retrouve associée à l'élastine où elle forme des interconnexions (liaisons covalentes) entre les différentes fibres et participe ainsi à ses propriétés mécaniques. (Wikipedia)
Elastine -- Détérioration
Enzymes microbiennes
Hydroxyproline
Peptidases
Résistance chimique
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In recent years, in order to reduce the pollution produced in beamhouse and tanning sections, more and more tanneries purchase wet blue from other factories in other regions directly used as raw materials for finished leather production thereby those polluted preliminary steps can be eliminated. Therefore, the wet blue bating process is an essential step to minimize the differences of wet blue which are purchased from different regions. In this study, the properties of different acid protease are analyzed for selecting suitable protease used for wet blue bating. The analysis of chromium tolerance of different acid proteases reveals that, Ll and L4 produced from Aspergillus have higher chromium resistance than that of produced from Bacillus. The effect of Ll and L4 on wet blue and collagen shows that the Ll has more excellent performance, in which the molecular weight of functional protein is 48 KD. By SEM and MCT analysis, Ll can successfully disperse the collagen fibers of wet blue. Furthermore, the biodegradation rates of collagen and elastin were 0.006‰ and 0.5‰, respectively. It indicates that the acid protease mainly degraded elastin but not collagen in bating process thereby ensuring production safety. This paper provides the importance references for the application and the basis for the development of mechanism of acid protease in bating process. Note de contenu : - EXPERIMENTAL : Materials - determination of chromium tolerance of acid proteases - Pretreatment of wet blue - Physical properties evaluation - Circular dichroism spectrometer analysis - Micro-structure observation - SDS-PAGE analysis - Preparation of enzymatic hydrolysate - Determination of hydroxyproline by HPLC method - Determination of desmosine in the hydrolysate by ELISA method - Calculating the biodegradation rate of collagen and elastin
- RESULTS AND DISCUSSION : Chromuim tolerance evaluation - Physical properties analysis - Effect of L1 and L4 acid protease act on collagen - Enzymatic properties of L1 acid protease - Observation of the porosity or dispersion of collagen fiber (bundle) - Analyze the biodegradation rate of L1 to structural protein in wet blueDOI : https://doi.org/10.34314/jalca.v115i1.1463 En ligne : https://drive.google.com/file/d/12pIVNJ4YE3q10psriwZc0l0bZLz6G4M7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33392
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 1 (01/2020) . - p. 10-15[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21484 - Périodique Bibliothèque principale Documentaires Disponible Anatomy of halophile induced damage to brine cured cattle hides / Russell H. Vreeland in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 4 (04/1998)
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Titre : Anatomy of halophile induced damage to brine cured cattle hides Type de document : texte imprimé Auteurs : Russell H. Vreeland, Auteur ; David G. Bailey, Auteur ; Sharon Angelini, Auteur Année de publication : 1998 Article en page(s) : p. 121-131 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In 1995 the United States exported over 20 million cattle hides with a market value of at least $1.4 billion dollars US. More than 70% of these hides are currently brine cured. The remainder are exported following chrome tanning as "wet blue stock". Brine curing has been an effective method for the preservation of hides for centuries. The process works well due to the fact that most degradative microorganisms are unable to survive the high concentrations of salt and the resultant low water activity present in the cured hide. Brine curing of hides does not, however, protect them from attack by halophilic bacteria. Extensive growth of these highly pigmented bacteria makes them readily visible to the naked eye. This condition is known industrially as 'red heat". It has long been believed by most hide processors, and tanners, that the presence of red heat indicates potential grain damage to the hide. Damage to the grain layer results in defective leather and significant financial loss to the industry. Note de contenu : - MATERIALS AND METHODS : Incubation of the hides with halophiles - Electron imaging
- RESULTS : Attachment experiments - Gross evaluation of incubated brine cured hide samples - Sem evaluation of the infected hide samplesEn ligne : https://drive.google.com/file/d/1ZU4sAhNFZ0FkHvMAvW7L-r9JSGOm_hEf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4521
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Code-barres Cote Support Localisation Section Disponibilité 006964 - Périodique Bibliothèque principale Documentaires Disponible Animal welfare and the five freedoms / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 49 (09-10/2021)
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Titre : Animal welfare and the five freedoms Type de document : texte imprimé Auteurs : Karl Flowers, Auteur Année de publication : 2021 Article en page(s) : p. 46-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Animaux -- Protection
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Déontologie professionnelle
Industrie -- Aspect de l'environnementIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Humans have always had a compassionate nature for animais. Since the dawn of time humans have interacted with animais as their food and as their companions. The domestication of wild animais to help manage their care in extensive/intensive food farm scenarios has taken hundreds of years to perfect. The welfare treatment of those animais has its ups and its downs. Cruel humans will be cruel to everything, and farmers are no exception. Kind humans have been compassionate and caring for animais since the beginning and will always continue to do so. Policy that moderates the cruelty and promotes the good practice is relatively recent.
Francis Brambell authored the Brambell report which introduced the concept of the Five Freedoms after Ruth Harrison wrote the Animal Machines' (Harrison, R., 1964 ; Brambell, 1965). In 1994, Webster (1994) was a ground breaker in the promotion of diagnosing different levels of care and furthered the concept of the 'Five Freedoms of Animal Welfare'. To be clear, this is not a statement saying this is the first time that mechanisms were put in place to treat animais with the right welfare - people have cared and treated animais correctly since the dawn of time. The Five Freedoms concept was the first time that policy, or discussion of policy, was taking place to improve the welfare of bad practitioners. The purpose of animal welfare is to correct the behaviour of the cruel.Note de contenu : - 'FIVE FREEDOMS' TO 'A LIFE WORTH LIVING' : Freedom from hunger and thirst - Freedom from discomfort - Freedom from pain, injury, or disease - Freedom to express normal behaviour - Freedom from fear and distress
- HIGHER QUALITY OF LIFE
- Table 1 : Five domains model (adapted from Melbor, 2016)
- Table 2 : Quality of life scale (taken from Mellor (2016) adapted from Green and Mellor (2011)En ligne : https://drive.google.com/file/d/1UbZlLf_U2TJrWWvoDxLPlJEfhVuzwTJR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36194
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Code-barres Cote Support Localisation Section Disponibilité 22863 - Périodique Bibliothèque principale Documentaires Disponible Anionic surfactant sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen by ultrasensitive microcalorimetry / Jie Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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Titre : Anionic surfactant sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen by ultrasensitive microcalorimetry Type de document : texte imprimé Auteurs : Jie Zhang, Auteur ; Chunhua Wang, Auteur ; Fengteng Zhang, Auteur ; Wei Lin, Auteur Année de publication : 2021 Article en page(s) : 6 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse conformationnelle
Calorimétrie
Collagène
Stabilité thermique
Surfactants
ThermodynamiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this communication, sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen were studied. We used ultrasensitive differential scanning calorimetry (US-DSC) to directly monitor the thermal transition of collagen in the presence of SDS. The results show that SDS affects the conformation and thermal stability of collagen very differently depending on its concentrations. At CSDS ≤ 0.05 mM, the enhanced thermal stability of collagen indicates the stabilizing effect by SDS. However, a further increase of SDS leads to the denaturation of collagen, verifying the well-known ability of SDS to unfold proteins. This striking difference in thermodynamics and conformational changes of collagen caused by SDS concentrations can be explained in terms of their interactions. With increasing SDS, the binding of SDS to collagen can be dominated by electrostatic interaction shifting to hydrophobic interaction, and the latter plays a key role in loosening and unfolding the triple-helix structure of collagen. The important finding in the present study is the stabilizing effect of SDS on collagen molecules at extreme low concentration. Note de contenu : - Experimental section : Materials - Sample preparation - Ultra-sensitive differential scanning calorimeter (US-DSC) measurements
- The interaction between SDS and collagen by microcalorimetryDOI : https://doi.org/10.1186/s42825-021-00063-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00063-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37545
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 6 p.[article]Anisotropy of physical-characteristic functions of fur leather / E. Mäntysalo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 4 (04/1991)
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Titre : Anisotropy of physical-characteristic functions of fur leather Type de document : texte imprimé Auteurs : E. Mäntysalo, Auteur ; M. Marjoniemi, Auteur ; E. Kemppinen, Auteur Année de publication : 1991 Article en page(s) : p. 133-140 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : According to recent investigations carried out in the LFLT the leather of fur has properties which must be considered anisotropic in nature contrary to those considered true random variables. Leather properties are functions of orientation angle and position coordinates of samples. Results are given for the leather of male and female blue fox (Alopex lagopus) and scan black mink (mustela vision) in the cases of breaking and elongation experiments. Four sample groups of fox leather (46 foxes) and one sample group of mink leather (21 mink) of different backgrounds as random subsets from the production of the year 1988 were investigated. All leathers were aluminum-tanned. En ligne : https://drive.google.com/file/d/13RsAmGvys9SODIb98TKVr7l6qER81g6a/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8506
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Code-barres Cote Support Localisation Section Disponibilité 006879 - Périodique Bibliothèque principale Documentaires Disponible Annonying energy. Part II - Solar heating of dark leather / N. de Volder in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)
PermalinkAnnual reports on specific topics in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 70 (Année 1986)
PermalinkAnnual reports on specifics topics in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 69 (Année 1985)
PermalinkAnomalies of pigskin structure / R. Monastyrska-Przybylak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
PermalinkAnomalies of pigskin structure / R. Monastyrska-Przybylak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
PermalinkAnomalies of pigskin structure / R. Monastyrska-Przybylak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
PermalinkAnthocyanidins of parkia clappertoniana / Raphael O. Adewoye in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)
PermalinkAnti-ectoparasite activity of medicinal herbal plant in terms of reducing ectoparasites effect on sheep and goat skins / Fitsum Etefa Ahmed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 11 (11/2023)
Permalink'Anti'-finish automotive leather - vision and contradiction / Brigitte Wegner in LEATHER INTERNATIONAL, Vol. 213, N° 4812 (07/2011)
PermalinkPermalinkAnti-finish concept - the way forward / Helfried Scheidl in LEATHER INTERNATIONAL, Vol. 216, N° 4837 (01-02/2014)
PermalinkAntibacterial activities of lichen derived extracts against different bacillus species from soak liquor samples / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 3 (03/2020)
PermalinkAntibacterial activity of myrtus communis essential oil used in soaking / Eser Eke Bayramoglu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)
PermalinkAntibacterial 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)
PermalinkAntibacterial and anti–biofilm activities of acetone extracts of Usnea sp. against mixed cultures of bacteria from soak liquor samples and tank surfaces / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 10 (10/2020)
PermalinkAntibacterial properties of several lichen extracts against two moderately halophilic bacteria from salted sheepskins / Ipek Türkmenoglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 4 (04/2022)
PermalinkAntibiotic susceptibility patterns of gram-negative moderately halophilic bacteria isolated from salted skins / Pinar Caglayan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 2 (03-04/2020)
PermalinkAntibiotics in hide preservation and bacteria control / George Stockman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 2 (02/2007)
PermalinkAntibiotics to control green hide biodeterioration / P. G. Berwick in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 74 (Année 1990)
PermalinkAntifungal activities against mould and yeast strains / Meral Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 80, N° 4 (07-08/1996)
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