Development of a headspace-solid phase micro extraction method for the analysis of volatile and semi-volatile organic compounds from polyurethane resins for leather finishing / Antonia Flores in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 8 (08/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 8 (08/2021) . - p. 290-297 Titre : Development of a headspace-solid phase micro extraction method for the analysis of volatile and semi-volatile organic compounds from polyurethane resins for leather finishing Type de document : texte imprimé Auteurs : Antonia Flores, Auteur ; Silvia Sorolla, Auteur ; Concepcio Casas, Auteur ; Rosa M. Cuadros, Auteur ; Anna Bacardit, Auteur Année de publication : 2021 Article en page(s) : p. 290-297 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse quantitative (chimie) Chromatographie en phase gazeuse Composés organiques volatils -- Analyse Cuirs et peaux -- Finition Extraction (chimie) Polyuréthanes Spectrométrie de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Volatile organic compounds (VOCs) and Semi-Volatile Organic Compounds (SVOCs) arise from the chemicals used in the various stages of the leather manufacturing process. An important aim of the tanning industry is to minimize or eliminate VOCs and SVOCs, without lowering the quality of leather. This paper shows the development of a new headspace-solid phase micro extraction coupled with gas chromatography–mass spectrometry (HS-SPME/GC-MS) method for the identification of VOCs and SVOCs emitted by newly designed polymers for the leather finishing operation. These new polymers are polyurethane resins designed to reduce the VOC and SVOC concentration. This method enables a simple and fast determination of the qualitative and semi-quantitative content of VOCs and SVOCs in polyurethane-type finishing resins. The chemicals that are of concern in this paper are the following: Dipropylene glycol Monomethyl Ether (DPGME), DBE-3 (a mixture of dibasic esters) and Triethylamine (TEA). The test conditions that have been determined to carry out the HS-SPME assay are the following: incubation time (2 hours), extraction temperature and time (40°C; 5 minutes) and the desorption conditions (280°C, 50 seconds). Ten samples of laboratory scale resins were tested by HS-SPME followed by gas chromatography (GC-MS). DPGME and DBE-3 (a mixture of dimethyl adipate, dimethyl glutarate and dimethyl succinate) have been identified effectively. The compounds are identified by a quantitative method using external calibration curves for the target compounds. The technique is not effective to determine the TEA compound, since the chromatograms shown poor resolution peaks for the standard. Note de contenu : - EXPERIMENTAL : Chemicals and reagents - Chromatography - HS-SPME method - OPTIMIZING THE HS-SPME/GC-MS TEST CONDITIONS : SPME fiber - Sample stirring - Sample preparation - Time exposure - Extraction conditions - Desorption and fiber reconditioning - RESULTS : HS-SPME/GC-MS optimized method for VOV and SVOC determination - Analytical calibration and quantification - Table 1 : Relation between the incubation time and eluted area for DPGME isomers - Table 2 : Extraction time and eluted area for DPGME isomers - Table 3 : Extraction temperature and eluted area for DPGME isomers - Table 4 : Desorption temperature and eluted area for DPGME isomers - Table 5 : Desorption time and eluted area for DPGME isomers - Table 6 : Optimised conditions for the HS-SPME assay of polyurethane resins - Table 7 : Identification of VOC compounds from NV004 by HS-SPME/GC-MS - Table 8 : Calibration curves by external standard from the four target compounds - Table 9 : Concentration of the target compounds in the resin samples by HS-SPME/GC-MS DOI : https://doi.org/10.34314/jalca.v116i8.4362 En ligne : https://drive.google.com/file/d/19a2FgbbF0GGCcFeDZvxeHmaljBNBVe1f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36086 [article]

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Study of the qualitative and semi-quantitative analysis of grape seed extract by HPLC / Silvia Sorolla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 3 (03/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 3 (03/2018) . - p. 88-93 Titre : Study of the qualitative and semi-quantitative analysis of grape seed extract by HPLC Type de document : texte imprimé Auteurs : Silvia Sorolla, Auteur ; Antonia Flores, Auteur ; Trini Canals, Auteur ; Rosa Cantero, Auteur ; Joaquim Font, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur Année de publication : 2018 Article en page(s) : p. 88-93 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse quantitative (chimie) Chromatographie en phase liquide à hautes performances Pépins de raisins Raisin et constituants Tanins -- analyse Tanins végétaux Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The main aim of this study is to carry out a qualitative and semi-quantitative analysis of tannin extracts as an alternative to the official analysis method ISO 14088 – IUC 32, so that a correlation between the two methods is established. From the point of view of the chemical composition, tannins are classified into two major groups : i) condensed tannins, also called flavanols or catechins, and ii) hydrolysable tannins, also called pyrogallic tannins. Today, the most widely used conventional extracts are quebracho, mimosa, chestnut, and tara. Quebracho and mimosa are condensed tannins, whereas chestnut and tara are hydrolysable tannins. The following extracts were used in this study: tara powder, commercial mimosa and quebracho extracts and extracts derived from grape seed, containing both condensed and hydrolysable extracts. The development of this new method will allow a faster and less expensive estimate of the amount of tannins present in a tannin extract. Note de contenu : - MATERIALS AND METHODS : Introduction - Obtaining grape seed extract - HPLC method for determination of tannins - RESULTS AND DISCUSSION : Analysis of patterns - Analysis of tannin extracts - FIGURES : 1. Typical UV-Vis spectrum of catechin compounds - 2. Typical UV-Vis spectrum of gallotannins - 3. Correlation between standard filter method ISO 14088-IUC 32 and total of peak areas by HPLC - 4. Grapetan chromatogram, PP2 sample En ligne : https://drive.google.com/file/d/1MyW25Rv0f6NbpHMtTDEDf9s4PAp5Wx1c/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30275 [article]

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