Dépouillements

Treatment using both direct and alternating electric currents on hide Bacteria in brine curing and pre-soaking liquors / Yasar Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 2 (03-04/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 2 (03-04/2014) . - p. 47-55 Titre : Treatment using both direct and alternating electric currents on hide Bacteria in brine curing and pre-soaking liquors Type de document : texte imprimé Auteurs : Yasar Birbir, Auteur ; Nazli Dolek, Auteur ; Meral Birbir, Auteur Année de publication : 2014 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries -- Inactivation Bain de saumure Courants électriques Cuirs et peaux -- Conservation Electrolyse Peaux brutes -- Trempe Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Animal hides support the growth of highly diverse Gram-negative and Gram-positive bacterial populations. These bacterial populations cause important damage to the hides during brine curing and pre-soaking processes, subsequently reducing the quality of the final leather. It is usually difficult to combat the diverse resistance offered by both Gram-negative and Gram-positive bacteria in these processes in a short time with conventional antimicrobials. Therefore, the present study examined the inactivation effect of a combined electric current treatment using both 1.5A direct and 2A alternating electric currents on: 1) each test isolate of Gram-negative bacteria (Enterobacter cloacae, Pseudomonas luteola, Vibrio fluvialis) and their mixed culture; 2) each test isolate of Gram-positive bacteria (Enterococcus faecium, Bacillus pumilus, Staphylococcus cohnii) and their mixed culture; 3) the mixed culture of test bacteria except for Gram-positive endospore-forming bacteria (Bacillus pumilus); 4) the mixed culture of all bacteria in liquid media containing organic substances and 25% NaCI. The test bacteria were isolated from salt-pack-cured hides. Two, three and four log reduction factors of all test bacteria were observed after the application of the direct electric current applied together with alternating electric current treatment for 12, 26 and 34 minutes, respectively. As a conclusion, the combined electric treatment applied for 34 minutes was found to be fairly effective in reducing the bacterial cell count to a relatively low level at which bacterial damage to the hides is reduced in brine curing and pre-soaking liquors. Note de contenu : - EXPERIMENTAL PROCEDURES : Test strains - Preparation of the test isolates - The electrolysis cell system - Inactivation of test bacteria with a combined treatment using both direct and alternating electric currents - RESULTS AND DISCUSSION : Use of electric currents reported in the literature En ligne : https://drive.google.com/file/d/1WJtYPXZpN3vkjZY99o4AeFG3p4SMF9uK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21134 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16193	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A dehydration process for ovine hide to obtain a new collagenous material / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 2 (03-04/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 2 (03-04/2014) . - p. 56-62 Titre : A dehydration process for ovine hide to obtain a new collagenous material Type de document : texte imprimé Auteurs : Lluis Ollé, Auteur ; Concepcio Casas, Auteur ; Anna Bacardit, Auteur Année de publication : 2014 Article en page(s) : p. 56-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène Cuirs et peaux de moutons Déshydratation Immersion Solutions aqueuses (chimie) Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of the present work is to develop a dehydration process for ovine hide to obtain a new collagenous material for use in the leather industry. What is obtained through this new process is a dry and very porous collagenous substrate which allows the application of tanning chemicals by immersion in aqueous solutions. When compared to existing, traditional processes, economic and environmental advantages are obtained from the use of this new material. More specifically, the new process results in reductions in water use (18%), chemical use (39%), and process time (11%). Note de contenu : - MATERIAL AND METHODS : Material - Analysis of the degree of dehydration - RESULTS AND DISCUSSION : Dehydration process - Tanning by immersion of a dehydrated ovine pelt En ligne : https://drive.google.com/file/d/1zIB646SrK7X-zVzOvZH9IpLzxbfCso5v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21135 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16193	-	Périodique	Bibliothèque principale	Documentaires	Disponible

The quantitative calculation between chrome technological parameters in leather making and chrome absorptivity / E. Tao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 2 (03-04/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 2 (03-04/2014) . - p. 63-68 Titre : The quantitative calculation between chrome technological parameters in leather making and chrome absorptivity Type de document : texte imprimé Auteurs : E. Tao, Auteur ; Ma Hong-Rui, Auteur ; Chang Hao, Auteur Année de publication : 2014 Article en page(s) : p. 63-68 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Calcul Chrome trivalent -- Absorption Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The relationship between the single technological parameter and chrome absorptivity [percentage of total chrome absorbed] based on laboratory tests and process manual data was studied. Stepwise regression analysis was employed to obtain the quantitative correlation between tanning parameters and chrome absorptivity, on the basis of establishing a relationship between multi-process parameters and comprehensive factors of chromium binding capacity using commercial tanneries actual measurements as contrast. The results showed that, the quantitative calculation of chrome absorptivity through technological parameters could absolutely reflect the actual situation in the tanning process amongst the multiple steps in the heterogeneous and mixed systems contained in the leather making processes. Note de contenu : - DESIGN OF CHROME ABSORPTIVITY EQUATION (Percentage of chrome absorbed). Quantitative calculation equation : Process of chrome absorptivity quantitative calculation - Factors having influence on quantitative chrome absorptivity calculation - RESULTS AND DISCUSSION : Effects of single process parameters on the chrome absorptivity of leather - Establishment of the relationship between the comprehensive factors of chrome binding capacity - Establishement of quantitative calculation and experimental verification of chrome absorptivity En ligne : https://drive.google.com/file/d/1skYx6Pz8VPKsEQbNGU2P22dv_IqfkxKb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21136 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16193	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Fabrication of highly hydrophobic paper by coating with modified collagen hydrolysate / Yaohui You in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 2 (03-04/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 2 (03-04/2014) . - p. 69-75 Titre : Fabrication of highly hydrophobic paper by coating with modified collagen hydrolysate Type de document : texte imprimé Auteurs : Yaohui You, Auteur ; Yunhang Zeng, Auteur ; Yishan Liu, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2014 Article en page(s) : p. 69-75 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anhydride alcényle succinique Biopolymères Collagène Dip-coating Hydrolysats de protéines Hydrophobie Papier Procédés de fabrication Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An environmentally friendly biopolymer (CAA) used as a coating material for the preparation of hydrophobic paper has been developed by incorporating alkenyl succinic anhydride (ASA) into collagen hydrolysate (CH), the base paper was treated with CAA by a dip-coating technique to improve its water resistance. It was found that the acylated CH has a significantly higher surface hydrophobicity than CH and that coating with CAA is beneficial to improve the hydrophobic property of paper. Experimental results indicated that the contact angle of water droplet on CAA-coated paper surface was about 125° and the CIO ratio of CAA-coated paper was increased to 3.76. XPS analysis and FESEM images of paper surfaces proved that CAA was well retained on the surface as a hydrophobic layer. Moreover, the strength properties of CAA-coated paper were superior to those of uncoated paper. Note de contenu : - Materials - Preparation of CH - Syntheses of CAA - Properties of CAA - Properties of CAA/CH-coated papers En ligne : https://drive.google.com/file/d/1gYPnS1drOfHgozGK82vSCFvnbzwaeuNJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21137 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16193	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Detecting dimethyl fumarate content in leather and textile products by GC-MS / Kejie Fu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 2 (03-04/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 2 (03-04/2014) . - p. 76-81 Titre : Detecting dimethyl fumarate content in leather and textile products by GC-MS Type de document : texte imprimé Auteurs : Kejie Fu, Auteur ; Chi Zhang, Auteur ; Hui Zhang, Auteur ; Wenlong Zhou, Auteur Année de publication : 2014 Article en page(s) : p. 76-81 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate d'éthyle L'acétate d'éthyle (éthanoate d'éthyle) est un liquide, à l'odeur caractéristique du dissolvant de vernis à ongles. C'est un ester résultant de l'éthanol et de l'acide acétique utilisé principalement comme solvant. On le trouve, à l'état naturel, en faibles quantités dans le rhum et dans les raisins endommagés par la grêle. L'acétate d'éthyle est un solvant de polarité moyenne, peu toxique15 et non hygroscopique, qui possède une grande volatilité. C'est un accepteur faible en raison de liaisons hydrogène. Il peut dissoudre jusqu'à 3 % d'eau et possède une solubilité dans l'eau de 8 % à température normale. Cette solubilité augmente avec la température. Il est instable au contact de bases et d'acides forts en présence desquels il est hydrolysé en acide acétique (acide éthanoïque) et éthanol. Il est rarement utilisé comme solvant pour une réaction chimique en raison de sa réactivité avec les bases et les acides. Chimie analytique Chimie textile Chromatographie en phase gazeuse Cuirs et peaux -- Analyse Extraction par solvant Fumarate de diméthyle Spectrométrie de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : According to the EU (2009/251/EC), the presence of DMFm in products should be below the maximum limit of 0.1ring/kg. In this paper, the gas chromatography-mass spectrometry (GC-MS) method is used to determine the content of DMFm in leather and textile products. This method is simple, rapid, and highly accurate. An Agilent 6890N-5973 GC-MS instrument and a DB-5MS column are used in this method. By optimizing the extraction process parameters, the best extraction solvent for DMFm with over 90% extracted is ethyl acetate, and the method successfully quantifies DMFm with a good linear relationship (R2=0.9998) within the range 0.1-20mg/kg. The recovery rate of this method is 80-100%, the RSD is 2.3-9.1%, and the lowest detection limit is determined as 0.01mg/kg. Note de contenu : - EXPERIMENTAL DETAILS : Materials and instruments - Preparation of standard stock solution - Sample preparation - GC-MS analysis conditions - Calculation results - RESULTS AND DISCUSSIONS : Selection of DMFm extraction solvent - Determination of parameters for DMFm extraction from samples - Selection of concentration and volume reduction method of the sample extract - GC-MS qualitative and quantitative analysis of the samples - Determination of standard curve - Recovery rate, precision and detection limit En ligne : https://drive.google.com/file/d/1oQEVyh2Y5BLT0ItaBcOKDW5UFAOnMU-W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21138 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16193	-	Périodique	Bibliothèque principale	Documentaires	Disponible