Alkaline hydrolysis combined with stir-bar sorptive extraction or sonication for the determination of banned azo dyes in leather / L.-H. Ahlström in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 9 (09/2007) . - p. 280-287 Titre : Alkaline hydrolysis combined with stir-bar sorptive extraction or sonication for the determination of banned azo dyes in leather Type de document : texte imprimé Auteurs : L.-H. Ahlström, Auteur ; L. Mathiasson, Auteur ; Eva Joo, Auteur ; L. Rowshanzamir, Auteur Année de publication : 2007 Article en page(s) : p. 280-287 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Two approaches based on alkaline hydrolysis, in combination with either stir-bar sorptive extraction (SBSE) or sonication, were developed for the determination of banned azo dyes in bovine leather. All dyes were determined indirectly by measuring their corresponding harmful amines, formed after chemical reduction. Quantification was performed by employing standard addition methodology to compensate for analyte losses due to sample preparation (e.g. incomplete extraction). The mean recoveries (n=3) obtained by employing the SBSE and sonication procedures were 100 percent (RSD=26 percent) and 114 percent (RSD=11 percent), respectively. The linearity of the standard addition curves obtained was reasonable [SBSE (mean R2=0.980) and sonication (mean R2=0.997)]. Both procedures were very simple to perform and provided clean LC-UV chromatograms. Taking into account the repeatability, sonication was considered the preferred alternative. En ligne : https://drive.google.com/file/d/1TqiVu4KmycU7VC8VOxhmF7ZNU2bYr0zn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3344 [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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