Fluorescent tracing of dialdehyde sodium alginate tanning agent in leather matrix / Min Zhu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 9 (09/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 9 (09/2023) Titre : Fluorescent tracing of dialdehyde sodium alginate tanning agent in leather matrix Type de document : texte imprimé Auteurs : Min Zhu, Auteur ; Yudan Yi, Auteur ; Jia Fu, Auteur ; Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur Année de publication : 2023 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Alginate de sodium dialdéhyde Cuirs et peaux -- Analyse Traçage fluorescent Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dialdehyde polysaccharides possess a sustainable nature and good tanning performance. However, the lack of specific detectable groups in their molecular structure results in the difficulty in the determination of the location of dialdehyde polysaccharides in leather fiber networks. In this study, dialdehyde sodium alginate (DSA) tanning agent was fluorescent labeled by 5-(4,6-dichlorotriazinyl) aminofluorescein (DTAF). The purified DTAF–DSA showed high and stable fluorescent intensity at emission wavelength of 515.2 nm when the pH was over 6.0, and the temperature was in the range of 20°C to 50°C. DTAF–DSA was used in tanning and tracked using fluorescence microscopy. Its penetration in the fiber network could be clearly visualized, and its distribution in leather differed with the molecular weight of DSA. As a result, this fluorescence tracing technique could display the mass transfer behavior of dialdehyde polysaccharide tanning agents in leather matrix, which will provide underlying data for tanning mechanism exploration. Note de contenu : - EXPERIMENTAL : Materials - Preparation of DSA - Fourier Transform Infrared (FT-IR) spectroscopy analysis - Determination of aldehyde group content of DSA - Preparation of DTAF labeled DSA (DTAF-DSA) - Analysis of fluorescence emission spectra - Thermal and pH stability of DTAF-DSA - Determination of molecular weight - Observatio of DTAF-DSA during tanning - RESULTS AND DISCUSSION : Characteristics of DSA - Characteristics of DTAF-DSA - Fluorescent tracing of DTAF-DSA in leather - Table 1 : Molecular weight of DSA and DTAF-DSA DOI : https://doi.org/10.34314/jalca.v118i9.8189 En ligne : https://drive.google.com/file/d/102ZOVOqbg3NIxrQXuw1XmjwRI5mq8gYX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39826 [article]

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Investigations on the general properties of biomass-based aldehyde tanned sheep fur for its selective post-tanning processing / Wei Ding in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p. Titre : Investigations on the general properties of biomass-based aldehyde tanned sheep fur for its selective post-tanning processing Type de document : texte imprimé Auteurs : Wei Ding, Auteur ; Ya-Nan Wang, Auteur ; Jianfei Zhou, Auteur ; Haiteng Liu, Auteur ; Xiaoyan Pang, Auteur ; Bi Shi, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alginate de sodium dialdéhyde Biomasse Chimie analytique Fourrures Fourrures -- Propriétés physiques Fourrures -- Teinture Laine de mouton Post-tannage Rayonnement ultraviolet Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dialdehyde sodium alginate (DSA) is an alternative chrome-free tanning material for fur production. To obtain satisfactory resultant fur and provide suggestions for the usage of DSA in fur making, the general properties of DSA tanned sheep fur were systematically investigated. The tanning mechanism of DSA was analyzed and it was verified that DSA was mainly combined with collagen fiber by forming Schiff base covalent bonds while supplemented by a small number of hydrogen bonds and ionic bonds. Due to the acid sensitivity of Schiff base structure, DSA tanned fur had poor resistance to acid rinsing but had excellent resistance to washing and good fatliquoring performance. Also, it had good resistances to yellowing and reductant. After being retanned by chrome tanning agent, the fur was capable of enduring a high-temperature dyeing process (68 °C for 8 h). Overall, DSA tanned sheep fur had favorable properties under appropriate post-tanning processing conditions to manufacture light-colored or dark-colored fur products with desirable physical properties. Note de contenu : - EXPERIMENTAL : Materials - Tanning mechanism analysis of DSA - Fatliquoring of DSA tanned fur - Interactions between Cr (III) and DSA - Chrome-reduced combination tanning trials - Analytical methods - RESULTS AND DISCUSSION : Tanning mechanism of DSA - Stability of DSA tanned sheep fur - Fatliquoring performance - Chrome-reduced combination tanning performance based on DSA - combination tanned sheep fur - Table 1 : Effect of UV-irradiation on the chrominance of tanned sheep fur - Table 2 Physical properties of fatliquored DSA tanned sheep fur - Table 3 High-temperature dyeing performance of chrome-reduced - Table 4 : Physical properties of fatliquored sheep fur made from chrome-reduced combination tanning based on DSA DOI : https://doi.org/10.1186/s42825-020-00047-8 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00047-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37466 [article]

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Tanning with natural polymeric materials. Part 1 : Ecofriendly tanning using dialdehyde sodium alginate / Swarna Vinodh Kanth in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 6 (11-12/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 6 (11-12/2007) . - p. 252-259 Titre : Tanning with natural polymeric materials. Part 1 : Ecofriendly tanning using dialdehyde sodium alginate Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; Balaraman Madhan, Auteur ; M. J. Philo, Auteur ; S. Mithuna, Auteur ; J. R. Rao, Auteur ; B. U. Nair, Auteur Année de publication : 2007 Article en page(s) : p. 252-259 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Alginate de sodium dialdéhyde Caractérisation Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux de chèvres Oxydation Réticulation (polymérisation) Tannage synthétique Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The characteristics of DSA as a tanning agent have been investigated using DSA prepared by selective periodate oxidation of the natural polymer sodium alginate (SA). Shrinkage temperature and enzyme stability of leathers at varied DSA concentrations, pH, and time were examined, treatment of goatskins gave a maximum shrinkage temperature of 80°C at pH8. The formation of the crosslinks between DSA and the collagen of goatskins gav significant stability to leathers against enzymatic degradation (collagenase). The degree of crosslinking was studied using trinitrobenzene sulphonic acid (TNBS). The degree of crosslinking was found to increase with the increase in degree of oxidation of SA and the concentration of DSA. In this investigation, the properties of DSA tanned leathers are discussed and the tannage optimized. The DSA leathers were compared with chrome-tanned leathers for handle. Note de contenu : - EXPERIMENTAL PROCEDURES : Reagents - Periodate oxidation of sodium alginate - Determination of degree of oxidation - Determination of dialdehyde content - Solubility of DSA - Determination of pH - TANNING TRIALS USING DSA - EFFECT OF VARIOUS PARAMETERS : Influence of fatliquor - Comparison of DSA leathers with control leathers - Estimation of aldehyde fixed to collagen - Collagenase hydrolysis of the dialdehyde sodium alginate tanned leather - Measurement of degree of crosslinking - Organoleptic properties of tanned leathers - RESULTS AND DISCUSSION : Characterization of tanning agent - Tanning Trials - Collagenase hydrolysis of DSA tanned leathers - Degree of crosslinking - Handle - Table 1 : Tanning process using DSA from pickled goat skins - Table 2 : Tanning process for control leathers - Table 3 : Post tanning process for leathers tanned with DSA at different oxidation and BCS - Table 4 : Periodate oxidation of DSA - Table 5 : Shrinkage temperature, DSA fixation and collagen degradation of delimed pelt and DSA tanned leathers at varying conditions - Table 6 : Degree of crosslinking of collagen treated with DSA of different oxidation levels/concentrations and pH results for 92% oxidized DSA En ligne : https://drive.google.com/file/d/1PV7wgVS9JaIyGDMxGkxr3rU2tGiZMsGL/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39008 [article]

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Tanning with natural polymeric materials. Part 2 : Efficiency of dialdehyde sodium alginate as a bi-functional cross-linking agent in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 2 (03-04/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 2 (03-04/2008) Titre : Tanning with natural polymeric materials. Part 2 : Efficiency of dialdehyde sodium alginate as a bi-functional cross-linking agent Type de document : texte imprimé Année de publication : 2008 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alginate de sodium dialdéhyde Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Gonflement (physique) Mesure Réticulants Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The physical properties of collagen are profoundly influenced by the method and extent of cross-linking. Dialdehyde sodium alginate (DSA) at various oxidation levels was used to cross-link collagen. The number of covalent cross-links introduced in collagen by DSA has been quantified by calculating cross-linking density, swelling ratio, thermo-mechanical properties and stress-strain characteristics. 92% oxidised DSA (DSA-92) gave the maximum number of cross-links at pH8 compared to other versions. The number of cross-links has been found to increase with increase in oxidation of DSA and dialdehyde functionality. The spatial orientation of amino acid side chain residue during crosslinking of collagen plays an important role in determining the cross-linking density and consequent physical properties of the collagen matrix. Note de contenu : - EXPERIMENTAL : Reagents and chemicals - Preparation of collagen membranes - Cross-linking conditions - Cross-linking density measurements - Hydrothermal isometric tension experiments - Swelling ratio - Measurement of stress-strain characteristics - RESULTS AND DISCUSSION : Cross-linking density of DSA treated collagen samples - Thermo-mechanical properties of DSA cross-linked collagen - Swelling ratio of DSA cross-linked collagen - Stress-strain behaviour of the DSA cross-linked collagen - Table 1 : Conditions for cross-linking collagen with DSA and GTA - Table 2 : Number of cross-links and average molecular weight of the chain between cross-links of control and cross-linked collagen membranes - Table 3 : Hydrothermal isometric tension, tensile strength and elongation of control and cross-linked collagen membranes En ligne : https://drive.google.com/file/d/1yzs3dv-batk-jLi89FXpeyI_vsu-5BJ_/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38932 [article]

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