Biomass-based tanning agent for sustainable leather manufacture via cyanuric chloride modified chitooligosaccharide / Min Jiang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 10 (10/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 10 (10/2023) . - p. 417-427 Titre : Biomass-based tanning agent for sustainable leather manufacture via cyanuric chloride modified chitooligosaccharide Type de document : texte imprimé Auteurs : Min Jiang, Auteur ; Yuanhang Xiao, Auteur ; Jun Sang, Auteur ; Chunhua Wang, Auteur ; Jiajing Zhou, Auteur ; Wei Lin, Auteur Année de publication : 2023 Article en page(s) : p. 417-427 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Analyse morphologique Biomasse Caractérisation Chitooligosaccharide Composés organiques -- Synthèse Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Poids Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Developing alternative tanning agents to avoid the potential environmental and human health risks from the conventional chrome tanning is essential for the leather industry. In this work, we prepared an eco-friendly biomass-based tanning agent dichlorotriazinyl chitooligosaccharide (DTCS) by modifying chitooligosaccharide (COS) with cyanuric chloride (CC) for chrome-free leather manufacture. The synthesis of such biomass-based tanning agent was systematically optimized to obtain the target product with high grafting degree of 67% and weight-average molecular weight (Mw) of 1465 g/mol. The non-pickling tanning procedure using DTCS was investigated, and the interactions between DTCS and collagen fibers were studied. Our results showed that the hydrothermal stability of the tanned leather was significantly increased, i.e., the shrinkage temperature (Ts) exceeding 82.0°C, and the mechanical properties were improved. Moreover, the organoleptic properties of leather (e.g., fullness, softness and grain tightness) exhibited obvious improvement. This research not only offers a reliable approach for cleaner leather manufacturing while addressing the underlying ecological pressure, but also highlights the emerging use of biomass materials in the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of DTCS - Determination of grafting degree (GD) of DTCS - Characterization of DTCS - DTCS tanning trials - Leather properties analysis - RESULTS AND DISCUSSION : Optimization of DTCS synthesis condition - Characterization of DTCS - Optimizatin of DTCS tanning process - Leather morphology anlaysis - Thickening rate analysis - Physical and organoleptic properties analysis - Table 1 : Tanning process for DTCS - Table 2 : Tanning process for F-90 - Table 3 : The average molecular weight and molecular-weight distribution of COS and DTCS - Table IV : The optimum tanning process of DTCS DOI : https://doi.org/10.34314/jalca.v118i10.8230 En ligne : https://drive.google.com/file/d/1csGAWb8R-ZPLSmdInoTLfYTzOcUHK0KN/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39940 [article]

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A novel ester-bonded gemini quaternary ammonium salt with good antimicrobial activity and anti-mold performance for wet blue leather / Tao Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 4 (04/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 4 (04/2022) . - p. 131-140 Titre : A novel ester-bonded gemini quaternary ammonium salt with good antimicrobial activity and anti-mold performance for wet blue leather Type de document : texte imprimé Auteurs : Tao Zhang, Auteur ; Chunhua Wang, Auteur ; Jun Sang, Auteur ; Long Zhang, Auteur ; Yuanhang Xiao, Auteur ; Wei Lin, Auteur Année de publication : 2022 Article en page(s) : p. 131-140 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ammoniums quaternaires Antifongiques Antimicrobiens Esters Evaluation Toxicologie cellulaire Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Herein, we have developed a kind of novel ester-bonded gemini quaternary ammonium salts microbicides named QAS(n+m) for leather application, in which n and m denotes the number of −CH2 between the ester groups on the spacer, and the length of alkyl chain connected to ester groups on the hydrophobic tail chain, respectively. Results indicate that the hydrophobic tail lengths and the spacer lengths in the QAS(n+m) structures affect their antimicrobial activities very differently. QAS(4+10) was used to investigate the antimicrobial mechanism, cytotoxicity, and antimold performance for wet blue leather as it exhibits the strongest antimicrobial effect. It shows QAS(4+10) is capable of inactivating microorganisms mainly by disrupting the integrity of their cell membranes. Compared to commercial leather microbicide product 2-thiocyanomethylthiobenzothiazole (TCMTB), QAS(4+10) exhibits comparable mold resistance and lower toxicity. The present work gives positive insight into the development of novel candidate microbicides for the preservation of wet blue leather. Note de contenu : - MATERIALS AND METHODS : Syntheses of gemini quaternary ammonium salts QAS(n+m) - Antimicrobial activity evaluation - ANTIMICROBIAL MECHANISM STUDY : Scanning electron microscopy (SEM) observation - Determination of K+ and soluble proteins content - Live/dead bacteria staining assay - Cytotoxicity assay ( CCK-8 test) - Anti-mold performance of QAS(4+10) for wet blue leather - RESULTS AND DISCUSSION : Antimicrobial activity evaluation - Antimicrobial mechanism study - Citotoxicity evaluation - Anti-mold performance of QAS(4+10) for wet blue leather - Table 1 : The MIC, MBC and MFC values of QAS(n+m) against different microorganisms - Table 2 : The K+ content and the soluble proteins content in the supernatant of A. niger spores with different treatment DOI : https://doi.org/10.34314/jalca.v117i4 En ligne : https://drive.google.com/file/d/1tpOpnHyYmlv6rkLycYRZXVVVJYwuJ4Cz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37560 [article]

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A novel non-pickling combination tanning for chrome-free leather based on reactive benzesulphonate and tannic acid / Yuanhang Xiao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 1 (01/2020) . - p. 16-22 Titre : A novel non-pickling combination tanning for chrome-free leather based on reactive benzesulphonate and tannic acid Type de document : texte imprimé Auteurs : Yuanhang Xiao, Auteur ; Chunhua Wang, Auteur ; Jun Sang, Auteur ; Wei Lin, Auteur Année de publication : 2020 Article en page(s) : p. 16-22 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Analyse quantitative (chimie) Benzène sulfonate Colorimétrie Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de chèvres Mesure pH -- Mesure Photostabilité Potentiel zeta Taille des particules Tanins Tannage chrome free 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 Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A non-pickling combination tanning based on reactive benzenesulphonate (rBS) and Tannic acid (TA) has been developed for the chrome-free leather manufacturing. By optimizing the tanning process, the two-bath combination tanning with 4% rBS and 10% TA at the final pH 3.0-3.5 can raise the shrinkage temperature (Ts) of goatskins to -86°C. Morphological analysis results reveal that the chrome-free leather exhibits a clear even grain surface and isolated collagen fiber network structure. The novel combination tanning approach not only improves light fastness, but also confers high physical and mechanical properties to the chrome-free leather which can meet the Chinese standard requirements for furniture leather and shoe upper leather. The non-pickling tanning without use of salt or acid is also benefit to clean leather-making production. Note de contenu : - EXPERIMENTS : Materials - Particle size determination of TA and rBS - Tanning process - Determination of shrinkage temperature - Measurement of the uptake of TA - Zeta potential measurements - SEM analysis - Determination of color difference - Physical and mechanical properties measurements - RESULT AND DISCUSSION : Optimization of rBS and Ta combination tanning combination tanning methods - The dosage of rBS and TA - Final pH - Zeta potential analysis - The synergistic tanning mechanism of rBS and TA - Color difference analysis DOI : https://doi.org/10.34314/jalca.v115i1.1464 En ligne : https://drive.google.com/file/d/1l3B3xNVwSsBqCpy7R5W4NHysSxHHVE0P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33393 [article]

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Polyethylene glycol as a preservative for pigskin and its interaction with collagen / Chunhua Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 10 (10/2018) . - p. 326-334 Titre : Polyethylene glycol as a preservative for pigskin and its interaction with collagen Type de document : texte imprimé Auteurs : Chunhua Wang, Auteur ; Huijuan Peng, Auteur ; Jun Sang ; Wei Lin Année de publication : 2018 Article en page(s) : p. 326-334 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Collagène Cuirs et peaux -- Conservation Cuirs et peaux de porcs Fourier, Spectroscopie infrarouge à transformée de Microscopie à force atomique Poids moléculaires Polyéthylène glycol Potentiel zeta Solutions de polymère Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Herein, an immersing method for the pigskin preservation by using polyethylene glycol (PEG) with different molecular weights (Mw = 200, 600, 6000) was developed and the influence of PEG on the conformation of type I collagen was investigated. Only PEG200 followed dehydration and rehydration patterns similar to that of salt curing and exhibits reasonably good preservative and bloodstains removal effects. Zeta potential analyses show that the collagen-PEG solutions have good dispersions stability. FT-IR and US-DSC results indicate that collagen triple helixes are kept integrated in the presence of PEG, and the highly hydrated feature of PEG helps to maintain the stability of the protein conformation. Atomic Force Microscope (AFM) images show that the collagen fibrils become more dispersed with the increasing Mw of PEG. The present work gives positive insight to partially replacing sodium chloride for the preservation of raw hide and skin, as well as the development of PEG-collagen biomaterials. Note de contenu : - EXPERIMENTAL : Materials - Preservation test with PEG - Inhibition zone test of PEG - Preparation of PEG-collagen samples - Zeta potential measurement - Fourier transform infrared spectroscopy (FT-IR) measurement - Ultra-sensitive differential scanning calorimeter (US-DSC) - Atomic force microscope (AFM) observation En ligne : https://drive.google.com/file/d/1LRY2hiHjLp_KYBqpszPrrHZyBO1vHOjE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31092 [article]

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