Anionic surfactant sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen by ultrasensitive microcalorimetry / Jie Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 6 p. Titre : Anionic surfactant sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen by ultrasensitive microcalorimetry Type de document : texte imprimé Auteurs : Jie Zhang, Auteur ; Chunhua Wang, Auteur ; Fengteng Zhang, Auteur ; Wei Lin, Auteur Année de publication : 2021 Article en page(s) : 6 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse conformationnelle Calorimétrie Collagène Stabilité thermique Surfactants Thermodynamique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this communication, sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen were studied. We used ultrasensitive differential scanning calorimetry (US-DSC) to directly monitor the thermal transition of collagen in the presence of SDS. The results show that SDS affects the conformation and thermal stability of collagen very differently depending on its concentrations. At CSDS ≤ 0.05 mM, the enhanced thermal stability of collagen indicates the stabilizing effect by SDS. However, a further increase of SDS leads to the denaturation of collagen, verifying the well-known ability of SDS to unfold proteins. This striking difference in thermodynamics and conformational changes of collagen caused by SDS concentrations can be explained in terms of their interactions. With increasing SDS, the binding of SDS to collagen can be dominated by electrostatic interaction shifting to hydrophobic interaction, and the latter plays a key role in loosening and unfolding the triple-helix structure of collagen. The important finding in the present study is the stabilizing effect of SDS on collagen molecules at extreme low concentration. Note de contenu : - Experimental section : Materials - Sample preparation - Ultra-sensitive differential scanning calorimeter (US-DSC) measurements - The interaction between SDS and collagen by microcalorimetry DOI : https://doi.org/10.1186/s42825-021-00063-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00063-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37545 [article]

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Experimental study on supercritical water oxidation of CI Reactive Orange 7 dye wastewater using response surface methodology / Jie Zhang in COLORATION TECHNOLOGY, Vol. 128, N° 4 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 4 (2012) . - p. 323-330 Titre : Experimental study on supercritical water oxidation of CI Reactive Orange 7 dye wastewater using response surface methodology Type de document : texte imprimé Auteurs : Jie Zhang, Auteur ; Shuzhong Wang, Auteur ; Yang Guo, Auteur ; Donghai Xu, Auteur ; Yanmeng Gong, Auteur ; Xingying Tang, Auteur Année de publication : 2012 Article en page(s) : p. 323-330 Note générale : Errata (voir URL) - Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Détérioration Colorants -- Oxydation Colorants azoïques Eaux usées -- Epuration Fluides supercritiques Surfaces de réponse (statistique) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Supercritical water oxidation of azo dye CI Reactive Orange 7 solution was investigated in a batch reactor. Response surface methodology was employed for the experimental design. Quadratic polynomial equations were established based on the results of the experiments. Optimisation of the process was then conducted in accordance with the simulated equations. The results show that removal of chemical oxygen demand, total organic carbon and total nitrogen can be achieved up to 99, 95 and 69%, respectively, and the predictive data were in reasonable agreement with the experimental results. It seems that response surface methodology is useful and feasible for the optimisation of CI Reactive Orange 7 dye wastewater supercritical water oxidation processing. The gas chromatography/mass spectrometry analysis results show that a large amount of 2,4-pentadienenitrile with diazo formed during the CI Reactive Orange 7 supercritical water oxidation reaction, which suggested that the azo firstly reacted to the diazo, and then converted into the final product of nitrogen. Note de contenu : - EXPERIMENTAL : Experimental apparatus and procedure - Materials and analytical methods - Calculation methods - Experimental design - RESULTS AND DISCUSSION : Model establishment for supercritical water oxidation of CI Reactive Orange 7 dye wastewater - Optimisation for supercritical water oxidation treatment of CI Reactive Orange 7 dye wastewater DOI : 10.1111/j.1478-4408.2012.00384.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00384.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15682 [article]

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