Changes in hydrothermal stability of collagen with several catechin-metal compounds : A DSC study / Chen Hui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 3 (05-06/2008) . - p. 93-95 Titre : Changes in hydrothermal stability of collagen with several catechin-metal compounds : A DSC study Type de document : texte imprimé Auteurs : Chen Hui, Auteur ; Shan Zhi-Hua, Auteur Année de publication : 2008 Article en page(s) : p. 93-95 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Catéchine La catéchine est une molécule de la famille des flavonoïdes de la sous-classe des flavanols. Elle est aussi connue sous le nom de catéchol, avec le risque de confusion avec le pyrocatéchol parfois dénommé lui aussi catéchol. L’usage dans la communauté scientifique a fini par imposer le terme de catéchine, dérivé du terme anglais catechin. Initialement découverte dans les fruits de l'acacia à cachou (Acacia catechu) duquel elle dérive son nom, la catéchine et ses nombreux isomères sont de puissants antioxydants qui aident à prévenir les maladies inflammatoires et coronariennes. Le terme de catéchine est aussi parfois utilisé pour désigner la classe des flavanols (flavan-3-ols, flavan-3,4-ols et leurs esters galliques). Pour éviter la confusion entre la classe et le composé, ce dernier est désigné dans ce contexte par (+/-)-catéchine. Collagène Ions métalliques Stabilité hydrothermale Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Differential scanning calorimetry (DSC) is a very useful tool to research the hydrothermal stability of collagen which has also been defined in the leather industry as denaturation temperature (Td). It has been widely used to describe the tanning power of materials, according to changes of Td. In this paper, changes in hydrothermal stability of collagen with several catechin-metal compounds were described using DSC curves. The Td results lead us to conclude that the hydrothermal stability of collagen can be improved by compounds formed with catechin and metal ions (Cr(III), Al(III) and Cu(II)).The more stable the compound, the higher the Td of collagen tanned with the compound ie.the stronger the tanning power of the compound and the higher the hydrothermal stability of collagen. En ligne : https://drive.google.com/file/d/1Tcwx3w0sW7caBzzr2bgT6rrxXAgeVG6N/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38952 [article]

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A cleaner chrome-free tanning regime : sulfonated urea-phenol-formaldehyde condensed polymer and ferrous sulfate tanning / Chen Hui in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 1 (01/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 1 (01/2011) . - p. 18-24 Titre : A cleaner chrome-free tanning regime : sulfonated urea-phenol-formaldehyde condensed polymer and ferrous sulfate tanning Type de document : texte imprimé Auteurs : Chen Hui, Auteur ; Guo Jun, Auteur ; Shan Zhi-Hua, Auteur Année de publication : 2011 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Formaldéhyde Phénol Polymères Résistance des matériaux Sulfate de fer Tannage Urée Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The potential of iron as a tanning agent has been known for a long time, but commercial exploitation has been limited because of concerns over loss of strength and darkening of color with time. To overcome these drawbacks, a combination tannage using ferrous sulfate and phenol-condensed polymers is proposed. Trials indicate that a combination tannage using sulfonated urea-phenol-aldehyde-condensed polymer (Sul.) after ferrous sulfate (Fe(II)) treatment produces favorable results. Shrinkage temperatures of up to 90°C were observed, with tensile strength of 238.3 kg/cm2, tear strength of 73.3 kg/cm, and elongation at break of 62.1%. The Sul.-Fe(II) tanned leather was lighter in color compared to iron tanned leather, and neither a darkening of color or a reduction in strength upon ageing was observed. The combination tanning system also has demonstrable environmental benefits compared to basic chromium sulfate (BCS)-Fe(II) tanning systems. The Sul.-Fe(II) combined system helps to reduce chemical oxygen demand (COD), and total solids (TS) content. Through experiments it is evident that COD, TS loads are reduced by 37.59% and 36.35%, respectively for Fe(II)-Sul. method compared to Fe(II) method. So the developed Fe(II)-Sul. regime not only has advantages in reducing pollution loads but also seems to be techno-economically viable. En ligne : https://drive.google.com/file/d/1cy6pQrEl0xgcfOA3sPjck6v23csmx4bN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10520 [article]

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Deep treatment of ammonia nitrogen tannery wastewater by an electro-Fenton system / Chen Hui in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 11 (11/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 11 (11/2019) . - p. 421-428 Titre : Deep treatment of ammonia nitrogen tannery wastewater by an electro-Fenton system Type de document : texte imprimé Auteurs : Chen Hui, Auteur ; Li-Wei Chen, Auteur ; Li Shu Qing, Auteur ; Yao Hu, Auteur ; Shan Zhi-Hua, Auteur ; Dai Rui, Auteur ; Jie Yi, Auteur Année de publication : 2019 Article en page(s) : p. 421-428 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Azote ammoniacal Eau -- Épuration -- Élimination des composés organiques Eaux usées -- Epuration Eaux usées -- Teneur en azote ammoniacal Énergie -- Consommation Fenton, Réaction de Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of an Electro-Fenton system on the deep treatment of ammonia nitrogen (NH3-N) and corresponding removal rate was investigated in this article. By using simulated ammonia nitrogen wastewater, it included a Cl- concentration of 3000 mg/L, SO42- concentration of 100 mg/L according to conventional leather wastewater conditions. Furthermore, Cl- and SO42- can be used as supporting electrolyte. After pretreatment, the ammonia nitrogen concentration kept about 100 mg/L. The optimal treatment conditions of Electro-Fenton system were obtained throughout single factors experiments. The current density was 150 A/m2, the reaction time was 30 min, the plate spacing distance was 40 mm, and the reaction temperature was adjusted to 40°C. After flocculation treatment of leather wastewater, the ammonia nitrogen concentration was 142.11 mg/L, and the tanning wastewater was further treated with an Electro-Fenton system. The final ammonia nitrogen concentration was 11.23 mg/L, which meets the first-level wastewater discharge standard. The removal rate was 92.10%, which indicated that the Electro-Fenton system is one kind of clean, feasible and sustainable treatment method for the deep treatment of ammonia nitrogen in tannery wastewater. Note de contenu : - EXPERIMENTAL : Materials - Treatment of simulated ammonia nitrogen wastewater by electro-Fenton - Tanning wastewater treatment - Measurement of ammonia nitrogen concentration - COD cr measurement of tanning wastewater - Energy consumption during of electro-Fenton treatment - RESULTS AND DISCUSSION : Treatment of simulated ammonia nitrogen wastewater by electro-Fenton - Ammonia nitrogen removal from tannery wastewater by electro-Fenton - Energy consumption by the electro-Fenton system En ligne : https://drive.google.com/file/d/1Hsz8qjc34jlp6868Xbet1lVoQWfrmfYX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33254 [article]

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Ferrous-gluconic acid compound tanning : a cleaner chrome-free tanning system / Yang Mao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 7 (07/2013) . - p. 257-265 Titre : Ferrous-gluconic acid compound tanning : a cleaner chrome-free tanning system Type de document : texte imprimé Auteurs : Yang Mao, Auteur ; Yi Jie, Auteur ; Shan Zhi-Hua, Auteur ; Chen Hui, Auteur Année de publication : 2013 Article en page(s) : p. 257-265 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Cuirs et peaux -- Propriétés mécaniques Gluconique, Acide L'acide gluconique (C6H12O7) est un acide très répandu aussi bien chez les animaux que dans les plantes. Il est le plus souvent intégré dans une molécule plus grande comme c'est le cas dans diverses gommes. Il est obtenu à partir de la gomme d'acacia, à partir de laquelle on l'isole sous la forme de cristaux en aiguilles fondant à 165 °C. Il est soluble dans l'eau et l'alcool. Il est autorisé en Europe comme additif alimentaire (E5748). Ions fer Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In order to evaluate the reaction mechanism between Fe2+-gluconic acid compound and collagen, the combination tanning of type-I collagen with Fe2+-gluconic acid compound was studied by UV-Vis spectroscopy, infrared spectroscopy, circular dichroism, and differential scanning calorimetry. The molar ratio for the reaction between Fe2+ and gluconic acid was 1:3. The resulting increased thermal stability could be attributed to crosslinks formed between the compound and collagen. The tanning trials indicated favorable results. The shrinkage temperature observed was 96°C, with tensile strength of about 239 kg/cm, elongation at break of about 63% and tear strength of about 74 kg/cm. The leather tanned with the Fe2+-gluconic acid compound was lighter in color compared to the single ferrous sulfate (Fe(II)) tanning system, and had neither a darkening of color nor a reduction in strength properties. It was also clear that COD and TS loads were decreased by 26.5% and 29.8%, respectively compared to Fe(II) system, 7.3% and 26.1%, respectively, compared to BCS system. Studies show that the disadvantages connected with Fe(II) tanning system including loss of strength and darkening of color have been solved successfully. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the Fe2+-glucnic acid compound - UV-Vis spectral studies - FT-IR spectra - Elemental analysis - Viscosity measurements - CD spectroscopy - DSC determination - Tanning trials - Analysis of strength characteristics - Spent tan liquor analysis - RESULTS AND DISCUSSION : UV-vis spectral studies - FT-IR studies - Elemental analysis - Viscosity analysis of the collagen-Fe2+-gluconic acid system - CD studies - DSC studies - Physical properties analysis of leathers - Spent tanning liquor analysis En ligne : https://drive.google.com/file/d/1TTrHv9Q4Ceid9uZIuiBo1ApYG2CsL0EW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19010 [article]

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Lime-free removal of non-collagen proteins from sheepskins : quantitative analysis by gel electrophoresis / Shan Zhi-Hua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 229-232 Titre : Lime-free removal of non-collagen proteins from sheepskins : quantitative analysis by gel electrophoresis Type de document : texte imprimé Auteurs : Shan Zhi-Hua, Auteur ; Li Shu Qing, Auteur ; Liu Jian-Wei, Auteur ; David L. Ollis, Auteur Année de publication : 2009 Article en page(s) : p. 229-232 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sulfide and lime are the major source of pollution in leather processing. Biotechnological methods have been developed to eliminate the need for sulfide and lime replacing them by enzymes. Removing non-collagen proteins and opening-up the collagen matrix are achieved by the contamination of alkali and salts without lime. In this work, samples of sheepskin were digested with three proteases for de-hairing. The non-collagen proteins were removed using NaOH, CaCl2 and MgCl2. We have demonstrated that gel electrophoresis, techniques can be used for quantitative analysis of the release of nucleic acids and proteins from the enzymatic digested sheepskins. The optimum condition for de-hairing and removing non-collagen proteins were screened using this technique. We found that the best result for the beamhouse operation or pre-tanning was the combiantion of enzyme 166 digestion and soaking with a solution of 1.0%NaOH, 0.25~0.75% MgCl2, 0.25~0.75% CaCl2, at 30°C for 16 hours. Sulfide and lime were not required in the process. En ligne : https://drive.google.com/file/d/1wf4mvQTTKdSXAelkKjgWaw0djkSeeO0S/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7291 [article]

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A novel synthesized melamine compound for leather making / Wang Yu-Zeng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)  

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The characteristics of oxidized lactose-metal complexes and their interaction with collagen / Chen Hui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 5 (09-10/2007)  

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The influence of salicyclic-metal compounds on the hydrothermal stability of collagen / Wang Ya-Juan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 2 (03-04/2008)  

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The production of organic fertilizer using tannery sludge / Feng Guo-Tao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 5 (05/2013)  

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The reaction mechanism between collagen and phenol/oxazolidine e tanning matrices / Chen Hui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 1 (01-02/2009)  

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