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HPLC versus spectrophotometry for the quantitation of trace amounts of formaldehyde in leathers / Nicolas Blanc in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 1 (01/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 1 (01/2009) . - p. 1-8 Titre : HPLC versus spectrophotometry for the quantitation of trace amounts of formaldehyde in leathers Type de document : texte imprimé Auteurs : Nicolas Blanc, Auteur ; Alain Berthod, Auteur ; Jean-Claude Cannot, Auteur ; Nathalie Humbert, Auteur Année de publication : 2009 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Français (fre) Catégories : Cuirs et peaux Formaldéhyde Spectrophotométrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Several countries recently tightened their regulation concerning the formaldehyde content in leather samples. The assay is commonly done following the instructions of the standard CEN ISO TS 17226-2003. The norm proposes two methods applied after aqueous micellar extraction of the shredded leather sample: a colorimetric method and a chromatographic method. 110 leather samples were assayed for formaldehyde content over a two year period. The two recommended methods were used in parallel. The results are compared showing a high coherence in trend. The differences in absolute values can be as high as 300% in the high (300 mg/kg) as well as in the low (3 mg/kg) concentration levels. The chromatographic method working with a diode array detector (DAD) was found three to four times more sensitive than the spectrophotometric method reaching a limit of quantification (LOQ) of 2.5 mg/kg. The chromatographic limit of detection (LOD) was found to be 0.5 mg/kg. 19 samples were assayed using a third method: liquid chromatography with mass spectrometry detection (MS). The LOD and LOQ values were lowered using a tandem quadrupole MS that has also a much better selectivity working in the secondary ion MS/MS mode. Such an expensive detector may not be justified at the present for formaldehyde evaluation. A fluorimetric detector is recommended. En ligne : https://drive.google.com/file/d/1lfO9_PNW3hU8K8sIpuHfSCUN21GAbrpT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3249 [article]

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Raman spectroscopy of wet blue bovine leather / Dennis C. Shelly in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 1 (01/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 1 (01/2009) . - p. 9-16 Titre : Raman spectroscopy of wet blue bovine leather Type de document : texte imprimé Auteurs : Dennis C. Shelly, Auteur Année de publication : 2009 Article en page(s) : p. 9-16 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Spectroscopie Raman Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A comprehensive, multi-instrument Raman spectroscopic study of wet blue bovine leather was performed in order to detect the weak, low frequency, organo-chromium vibrations in chrome tanned leather. Raman scattering spectroscopy is a complementary measurement to infrared absorption spectroscopy. Both types of vibrational spectroscopies theoretically enable the direct measurement of chromium-collagen interactions. Wet blue bovine leather was studied in two forms, slices and powder, by several different instruments (dispersive, Fourier Transform and holographic spectrometer). This paper is an overview of the instrumental and sampling requirements for high quality spectral measurements of this unique sample type. Observed peaks and spectral features are discussed. Implications for protein microstructure and process analysis applications are presented. En ligne : https://drive.google.com/file/d/10-mWaMPEzmKsCgDFe_o1r_iV0QK8AxMn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3250 [article]

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Phytoremediation of soil using Sesuvium Portulacastrum - Part I / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 1 (01/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 1 (01/2009) . - p. 17-24 Titre : Phytoremediation of soil using Sesuvium Portulacastrum - Part I : Removal of Na+ and Cl from tannery wastewater treated soil Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; R. Rengaswamy, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur ; P. Saravanan, Auteur ; A. Tamil Selvi, Auteur ; P. Ramesh Kannan, Auteur Année de publication : 2009 Article en page(s) : p. 17-24 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Salt tolerant halophyte Sesuvium portulacastrum (S. portulacastrum) is capable of absorbing sodium chloride. In the present study, the feasibility of using S. portulacastrum as a bioaccumulant for NaCl present in tannery wastewater has been studied. The plants were grown in soil fed with tannery wastewater with varying concentrations of NaCl. The growth parameters of the plants such as root and shoot length was studied. The amount of Na+ and Cl- accumulated by the plant in leaves and shoots were estimated. The accumulation of Na+ and Cl- increased with increase in plant density and salt concentration of tannery wastewater. However, it has been found that increase in salt concentration resulted in reduced growth of the plant. It has been observed that 34% of Na+ and 22% of Cl- were absorbed by the plant at a NaCl concentration of 15000 ppm at high plant density conditions. Maximum accumulation of Na+ and Cl- has been observed in leaves compared to stems and shoots. The results of the present work indicate that S. portulacastrum can be used for bioaccumulation of sodium chloride. En ligne : https://drive.google.com/file/d/1-Sp4AQLByGyxpRwvhUU1mRn5vvEB8QKa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3251 [article]

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Studies on the use of Sesuvium Portulacastrum - Part II / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 1 (01/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 1 (01/2009) . - p. 25-32 Titre : Studies on the use of Sesuvium Portulacastrum - Part II : Preservation of skins Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; S. Preethi, Auteur ; B. Keerthi, Auteur ; A. Tamil Selvi, Auteur ; P. Saravanan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2009 Article en page(s) : p. 25-32 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sesuvium portulacastrum (S. portulacastrum) a perennial halophyte has been used as a replacement for salt in the curing process of Goatskins. The quality of phyto-preserved skins has been assessed with respect to hair slip, putrefaction odor, bacterial count, moisture content, shrinkage temperature and total extractable nitrogen. Phyto-preserved skins have been processed into finished leathers and assessed for organoleptic properties and physical characteristics. The product for phyto-preservation made from S. portulacastrum has been found to be as effective as conventional salt based curing process of goat skins. The quality of the preserved skins has been found to be on par with that of salt cured skins. The quality of resultant leathers of the experiment has been found to be comparable with control. The preservation efficacy of phyto-preserve could be due to the synergistic action of its antimicrobial metabolite present in its essential oils and the salt present in the plant. En ligne : https://drive.google.com/file/d/14hda1FkeLXj0UgVSxvlq5OCMfL2Op41r/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3252 [article]

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