Structural differences between commercial acacia mangium tannin and its effluent / Teng Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 3 (03/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 3 (03/2016) . - p. 92-100 Titre : Structural differences between commercial acacia mangium tannin and its effluent Type de document : texte imprimé Auteurs : Teng Bo, Auteur ; Xiaoyun Jian, Auteur ; Yanping Gao, Auteur ; Jinwei Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2016 Article en page(s) : p. 92-100 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants Eaux usées -- Analyse Tanins -- analyse Tanins végétaux Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Recycling and reuse techniques provide an efficient way to overcome the environmental issues of the chrome tanning effluent. However, only few vegetable tanning related recycling techniques were developed due to the limited information about the effluent. In this study, a common vegetable tanning process was performed with a commercial Acacia Mangium tannin (CAMT) to produce Acacia Mangium tanning effluent (AMTE). The tannins in the AMTE and CAMT were characterized using Fourier transform infrared, nuclear magnetic resonance spectroscopy, matrix-assisted laser desorption/ ionization time of flight mass spectrometry, gel permeation chromatography and elemental analysis. The results showed that the stereochemistry and flavan-3-ol subunits of the tannins in the AMTE were the same with the CAMT. However the differences between the tannins in the AMTE and CAMT were presented in terms of the tannin category, molecular weight, and quantities of sulfo acid group. Tannins in the AMTE were mainly composed of procyanidin, while prodelphinidin and procyanidin content showed comparable in the CAMT. Average molecular weight of the AMTE was 1315Da, in contrast to an obviously higher value in the CAMT (2025Da). Meanwhile, higher sulfonic acid group content was also found in the AMTE. These differences were deduced in accordance with the collagen binding ability of the tannins. Results will be valuable for reuse and recycling of vegetable tanning effluent. Note de contenu : - EXPERIMENTAL : Sample preparation - FT-IR spectroscopy - MALDI-TOF MS spectroscopy - C NMR analysis - GPC analysis - Elemental analysis - RESULTS AND DISCUSSION : FT-IR spectroscopic characterization - MALDI-TOF MS analysis - C NRM spectra - GPC analysis - Element component of the tannins En ligne : https://drive.google.com/file/d/1h93Wgfoj7jQ915nRritx4c69BlUNfT03/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25744 [article]

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The impact of acid rain on vegetable tanned leather / Yanping Gao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 131-135 Titre : The impact of acid rain on vegetable tanned leather Type de document : texte imprimé Auteurs : Yanping Gao, Auteur ; Yang Shuang, Auteur ; Teng Bo, Auteur ; Jinwei Zhang, Auteur ; Jian Xiaoyun, Auteur ; Lucretia Miu, Auteur ; Carmen Gaidau, Auteur ; Wuyong Chen, Auteur Année de publication : 2016 Article en page(s) : p. 131-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Cuirs et peaux -- Analyse Cuirs et peaux -- Détérioration Cuirs et peaux -- Propriétés mécaniques Essais accélérés (technologie) Essais dynamiques Morphologie (matériaux) Pluies acides Tannage végétal Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Artificial acid rain was chosen to simulate the influences of gaseous pollutants on vegetable-tanned leather. The vegetable-tanned leather samples were soaked in the artificial acid rain for 0, 5, 10, 15, 20 and 25 days, at 50°C and 100% relative humidity conditions. Then, these samples were evaluated by various analytical methods. Micro hot table (MHT), differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to evaluate the influences of acid rain on thermal behaviours. Damage to mechanical properties were also analyzed by a standard method. Fourier transform infrared spectroscopy (FTIR) and optical microscopy were used to investigate the changes of structural and histological properties during ageing. With the extension of ageing time, thermal stability was gradually reduced to lower values, including shrinkage temperature, thermal denaturing temperature, associated enthalpy and temperature of maximum decomposition rate. ln addition, mechanical properties such as tensile strength, tear strength and elongation at break also gradually decreased. The FTIR results showed that, during the ageing process, the amide 1 and amide 11 bands of collagen were gradually shifted to lower numbers, indicating increasingly serious damage to the structure of the peptide chain corresponding to obvious fibril breakages which were also detected through optical microscopy. Note de contenu : - EXPERIMENTAL METHODOLOGY : Materials - Sampling - Preparation of artificial acid rain - Leather ageing process - Analytical methodology - RESULTS AND DISCUSSION : Thermal analysis - Mechanical properties - Morphology and structure En ligne : https://drive.google.com/file/d/1qSZYzF-OT_TZl-1LmxTyAgXz_8UA3qET/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26446 [article]

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