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Oxidative unhairing of leathers : Influence of several process parameters and environmental improvments / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 10 (10/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 10 (10/2006) . - p. 347-354 Titre : Oxidative unhairing of leathers : Influence of several process parameters and environmental improvments Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; M. Dolors Borras, Auteur ; Stefan Banaszak, Auteur Année de publication : 2006 Article en page(s) : p. 347-354 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of this project was to develop a type of unhairing using hydrogen peroxide, commercial amine and enzyme products. This unhairing system, which was carried out on a pilot plant scale, enables hair recovery and recirculation of floats in order to save water. The effect of the amine and enzyme products on the properties of vegetable-tanned leather was studied. In addition, five more consecutive unhairing processes were carried out by recirculating the effluents and reusing them according to their composition. After analysing the floats, the results obtained were compared to those achieved by using a reductive unhairing process with hair recovery. The results showed a 65 percent saving of water and a 97 percent decrease in toxicity. These results were compared with the bibliographical values of a reductive unhairing with hair dissolution. En ligne : https://drive.google.com/file/d/19TBlxk1RnQplSfN6NIbvREAczgVA0w3C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3972 [article]

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An ultrasound-assisted extraction procedure for the determination of banned azo dyes in leather / L. Ahlström in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 10 (10/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 10 (10/2006) . - p. 355-361 Titre : An ultrasound-assisted extraction procedure for the determination of banned azo dyes in leather Type de document : texte imprimé Auteurs : L. Ahlström, Auteur ; L. Mathiasson, Auteur Année de publication : 2006 Article en page(s) : p. 355-361 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The potential risk for consumers to be exposed to banned azo dyes in leather is strong motivation for the development of an analytical test procedure with improved accuracy. The currently most accepted analytical procedure for this application, the German standard DIN 53316 method, suffers from major drawbacks including low accuracy and the usage of hazardous organic solvents. As a consequence, an alternative procedure based on ultrasound-assisted extraction (UAE) was developed for the determination of banned azo dyes in leather. The optimized UAE procedure was applied to bovine, sheep, and goat leather. These results were compared with those obtained by employing the DIN 53316 method or microwave-assisted extraction (MAE). Usually, the performance of UAE was better than the DIN 53316 method and comparable to MAE. Furthermore, the UAE procedure utilizes acidified water as extraction solvent rather than methyl tert.-butyl ether. Because of its simplicity and the inexpensive equipment required, the proposed procedure has the potential to become the preferred alternative for analyzing banned azo dyes in leather on a routine basis. En ligne : https://drive.google.com/file/d/1L8dFJc_Kc2XGJVqWC4S2v1mMMMpTjupA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3973 [article]

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Effect of genipin on the thermal stability of hide powder / Keyi Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 10 (10/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 10 (10/2006) . - p. 362-367 Titre : Effect of genipin on the thermal stability of hide powder Type de document : texte imprimé Auteurs : Keyi Ding, Auteur ; Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2006 Article en page(s) : p. 362-367 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Genipin, a derivative of the iridoid glycoside geniposide in the fruit of Gardenia jasmindides Ellis, is a naturally occurring protein crosslinking agent, which is not cytotoxic, and is beginning to replace glutaraldehyde as a fixative for biological tissues. This study was undertaken to evaluate the potential of iridoid compounds, in particular genipin, for use as tanning agents. The tanning effect of genipin on bovine hide powder was investigated. Parameters including the dosage of genipin, reaction time, pH and temperature of the tanning process were varied. The peak temperature (Tp) obtained by differential scanning calorimetry (DSC) of treated hide powder was used to evaluate the tanning effect. The results indicated that hide powder which had been treated with 5% genipin at pH - 7 and 35 °C for 24 h had a Tp of 79 °C. A secondary observation was that the tanned hide powder exhibited a dark blue color characteristic of the reaction of primary amines with genipin. A likely mechanism for genipin tanning is discussed. These results provide a new potential approach to chromium-free tanning for the leather industry. En ligne : https://drive.google.com/file/d/1ELoFMHiGOAGb6EzYkud06iB9SmqW8Fpy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3974 [article]

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Environmental effects on chrome-free leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 10 (10/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 10 (10/2006) . - p. 368-375 Titre : Environmental effects on chrome-free leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Richard Ashby, Auteur ; Keyi Ding, Auteur Année de publication : 2006 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chrome-free leather has gradually gained commercial importance, particularly for automobile upholstery applications. In many respects, however, chrome-free leather is inferior to chrome-tanned leather. UV and heat are known to be more detrimental to chrome-free leather than to chrome-tanned leather, especially in regard to the colorfastness of dyestuff and mechanical properties. Temperature, UV radiation, and humidity are key environmental factors that affect leather properties. The role of humidity and its interaction with UV radiation and temperature on leather properties, however, are not clear to the leather industry, and this information is needed for formulation of antioxidants that will protect chrome-free leather from UV and heat damage. Therefore, a systematic study was performed to formulate the relationship between these three environmental variables and resultant colorfastness and mechanical properties. A second order regression equation was derived to plot response surfaces that clearly illustrate the relationship between the environmental variables and colorfastness, as well as the resultant physical properties. Observations showed an intriguing interaction between humidity and radiation dosage. Measurements revealed that an increase in humidity resulted in a decrease in colorfastness and mechanical strength. However, after the UV radiation dosage reaches a certain level, an increase in humidity may actually help maintain both properties. Observation showed the stiffness decreased steadily with humidity, whereas the toughness index slightly increased with humidity. This study also used differential scanning calorimetry (DSC) to determine the denaturation temperature as a function of various environmental conditions. We observed a correlation between colorfastness and the denaturation temperature. En ligne : https://drive.google.com/file/d/1YrimELoNqwkDh2OJ98D14sqdial4H1DM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3975 [article]

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