Biomass derived oligosaccharides for potential leather tanning / Zhicheng Jiang in COLLAGEN AND LEATHER, Vol. 5 (2023)  

[article]  inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 3 p. Titre : Biomass derived oligosaccharides for potential leather tanning Type de document : texte imprimé Auteurs : Zhicheng Jiang, Auteur ; Wei Ding, Auteur ; Jiajun Fan, Auteur ; Yuhe Liao, Auteur ; Javier Remón, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : 3 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomasse Cuirs et peaux Oligosaccharides Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The global demand for renewable and affordable feedstocks, combined with the worldwide targets for reducing carbon emissions, is the driving force behind a breakthrough in resource revolution and GreenTech innovations [1]. Owing to the vast reserves and short growing cycle, utilizing lignocellulosic biomass as an alternative to petroleum and environmentally friendly feedstock to furnish bioenergy and biomaterials is key to building a more sustainable future. Lignocellulose mainly contains three biopolymers, i.e., cellulose, hemicellulose and lignin. Over the centuries, utilization of lignocellulose has crossed its possible molecular scale ranging from 101 m, as the original matrix, to 10−10 m, as a monomeric molecule. Apart from directly using raw lignocellulose beyond the micron-grade scale (e.g., building and furnishing materials), depolymerization and structural modification can endow lignocellulose-derived molecules with smaller molecular dimensions and distinct functional groups, which can be further converted into a broad spectrum of chemicals with diverse industrial applications [2]. However, the selective production of a particular chemical or group of chemicals is very challenging due to the complex original structure of lignocellulosic biomass. Instead, mixed reaction products are produced, requiring complex and costly separation procedures to obtain specific fine chemicals with high purity. In comparison, detaining the biomass depolymerization/fractionation process at the early reaction stages offers new cost-effective opportunities. Notably, utilizing the mixed oligomers with widely distributed molecular sizes produced during partial biomass depolymerization eliminates the separation/purification stages and can be considered one of the most promising opportunities for lignocellulose biorefining at the industrial level. Herein, we discuss the recent applications of oligosaccharide derivatives from lignocellulosic biomass as a mixture for green leather tanning. DOI : https://doi.org/10.1186/s42825-023-00113-x En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00113-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40061 [article]

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Chrome-reduced combination tanning for cleaner dyed sheep fur processing / Wei Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 11 (11/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 11 (11/2015) . - p. 363-371 Titre : Chrome-reduced combination tanning for cleaner dyed sheep fur processing Type de document : texte imprimé Auteurs : Wei Ding, Auteur ; Yihan Chen, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2015 Article en page(s) : p. 363-371 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux de moutons Déchets -- Réduction Eaux usées -- Analyse Fourrures Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning is essential for conventional processing of dyed sheep fur as it can provide fur with high hydrothermal stability suitable for dyeing of wool at a temperature around 70°C. However, a long float length and a big offer of chrome tanning agent (16 g/L) are required for the tanning process, which lead to poor uptake of chrome and excessive discharge of chrome in wastewater. In this study, reduction of chrome offer in dyed sheep fur production was investigated to develop a cleaner tanning technology. It was found that the even distribution of chrome and satisfactory dispersion of fur collagen matrix were achieved even though chrome tanning agent offer was reduced to 2 g/L and 4 g/L. But the shrinkage temperature of the furs was only 79°C and 85°C, respectively, which resulted in a sharp area shrink of fur in following high temperature dyeing. In the combination tannage using 10 g/L amphoteric organic tanning agent (TWT) and 2 g/L or 4 g/L chrome tanning agent, the shrinkage temperature of fur was higher than 90°C accompanied by a higher utilization of chrome. These combination tanned furs were capable of enduring dyeing process at 68°C for 8 h, and presented a high uptake of post tanning chemicals because they had an isoelectric point close to that of chrome tanned fur. More importantly, the physical properties of the combination tanned dyed furs were comparable to the dyed fur made by conventional chrome tanning using 16 g/L chrome tanning agent. Note de contenu : - EXPERIMENTAL : Materials - Conventional chrome tanning of sheep fur - Chrome-reduced combination tanning of sheep fur - Post tanning processes of sheep fur - Determination of chrome content in sheep fur and dyeing wastewater - Scanning electron microscope (SEM) analysis of sheep fur - Estimation of area yield of sheep fur - Uptake of fatliquor and dyestuff in post tanning processes - Determination of isoelectric point of sheep fur - Determination of physical properties of fur - RESULTS AND DISCUSSION : Effect of reduction of chrome offer on tanning performance - Effect of reduction of chrome offer on dyeing performance - Chrome-reduced combination tanning using TWT - Dyeing performance of chrome-reduced combination tanned fur En ligne : https://drive.google.com/file/d/19OtOSxVNM2feFFTWNzaprneqTyX2j1al/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24865 [article]

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Dechroming of chromium-containing leather waste with low hydrolysis degree of collagen / Wei Ding in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 129-133 Titre : Dechroming of chromium-containing leather waste with low hydrolysis degree of collagen Type de document : texte imprimé Auteurs : Wei Ding, Auteur ; Xuepin Liao, Auteur ; Wenhua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2015 Article en page(s) : p. 129-133 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux Collagène -- Détérioration Cuirs et peaux -- Déchets -- Recyclage Déchromage Hydrolyse Séparation (technologie) Sulfurique, Acide Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dechroming is essential for utilization of chromium-containing leather wastes. Strong hydrolysis conditions favour breaking of the Cr and collagen linkage, but lead to a high degree of hydrolysis of the collagen se that the separation of chromium from the gelatinous hydrolysates becomes difficult. In this research, a mild acid-alkali alternate treatment of the waste with hydrolysis assistants was investigated, so as to develop a technology that has high dechroming level and low hydrolysis degree of collagen. A satisfactory dechroming method with four steps was finally obtained and the reaction conditions for each step were optimized as follows. Step 1 — waste in the solution with 2g1L NaOH and 40g/L urea {hydrolysis assistant) was stirred for 0.5 hours at 40°C. Step 2 — waste in 50g/L sulfuric acid solution was stirred for 1 heur at 40°C. Step 3 — waste in 40 g/L Cap% suspension was stirred for 2 hour at 30°C. Step 4 — waste in 50g/L suffuric acid solution was stirred for 1 hour at 30°C. With this method, total extent of the dechroming of the waste was higher Chan 97% while the hydrolysis degree of collagen was lower than 10%. Note de contenu : - MATERIALS AND METHODS : Materials - Dechroming procedure of the leather waste - Estimation of the degree of hydrolysis of collagen - RESULTS AND DISCUSSION : Effect of hydrolysis assistant on extent of dechroming - Effect of reaction temperature on dechroming extent - Effect of sulfuric acid concentration on dechroming extent - Effect of calcium hydroxide concentration on extent of dechroming - Hydrolysis degree of collagen En ligne : https://drive.google.com/file/d/190QFQUqFJeTolMygTcMeLAUQr_rYV12n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24257 [article]

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Determination of free formaldehyde in leather chemicals / Yudan Yi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 10 (10/2019) . - p. 382-390 Titre : Determination of free formaldehyde in leather chemicals Type de document : texte imprimé Auteurs : Yudan Yi, Auteur ; Wei Ding, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 382-390 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Chimie analytique Cuir -- Teneur en formaldéhyde Polyamines Produits chimiques -- Teneur en formaldéhyde Retannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Formaldehyde is widely used in the synthesis of various leather chemicals due to its high reactivity and low cost. It is probably introduced into leather when applying the chemicals to processing, and then released during storage and use of leather, which may pose a potential risk to human health. Existing method for determining formaldehyde in leather is helpless to deal with the complicated chemicals. In this study, a method was optimized for determination of free formaldehyde in leather chemicals based on ISO 27587. A 0.5-2.0 g sample of leather chemical (formaldehyde could range from 1.25 to 1250 mg/kg) was heated at 90°C in nitrogen atmosphere. The released formaldehyde was purged at a flow rate of 300 mL/min for 30 min, captured and derivatized using a bubble absorption tube containing 2,4-dinitrophenylhydrazine absorption solution, and then detected by HPLC-diode array detector. The recovery rate of formaldehyde standard solution was 91.0% with relative standard deviation (RSD) of 4.87% in seven times repeated trials. The repeated determinations of aldehyde tanning agents showed the formaldehyde recoveries higher than 90% and RSD lower than 7%, indicating the accuracy and precision of the method. Powdery amino resins were determined to contain a tiny amount of free formaldehyde using this method. However, it should be noted that hydrolyzed formaldehyde will be formed when the amino resins were dissolved in water and used in retanning, leading to the potential for bringing leather with high content of formaldehyde. Note de contenu : - EXPERIMENTAL : Materials - Determination of formaldehyde in leather chemicals - Effects of extraction conditions on the determination of formaldehyde - Effect of derivative devices on the determination of formaldehyde - Determination of formaldehyde in amino resin and leather - RESULTS AND DISCUSSION : Effect of extraction conditions on the determination of formaldehyde - Validation parameters of the proposed method - Effect of derivative devices on the determination of formaldehyde - Determination of formaldehyde content in amino resins and retanned leather En ligne : https://drive.google.com/file/d/1ovkzKqph88a5PaXbxWN0an2EWrZffTZZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33034 [article]

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Extraction, identification and free radical scavenging activities of collagen-derived peptides from yak hide / Guo Song in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 2 (03-04/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 2 (03-04/2022) . - p. 73-82 Titre : Extraction, identification and free radical scavenging activities of collagen-derived peptides from yak hide Type de document : texte imprimé Auteurs : Guo Song, Auteur ; Xiaoyan Pang, Auteur ; Qiaoe Wang, Auteur ; Wei Ding, Auteur ; Zhiwen Ding, Auteur Année de publication : 2022 Article en page(s) : p. 73-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides aminés Les acides aminés (ou aminoacides) sont une classe de composés chimiques possédant deux groupes fonctionnels : à la fois un groupe carboxyle –COOH et un groupe amine –NH2. Parmi ceux-ci, les acides α-aminés se définissent par le fait que leur groupe amine est lié à l'atome de carbone adjacent au groupe acide carboxylique (le carbone α), ce qui leur confère la structure générique H2N–CHR–COOH, où R représente la chaîne latérale, qui identifie l'acide α-aminé. Les acides α-aminés jouent un rôle fondamental en biochimie comme constituants élémentaires des protéines : ils polymérisent en formant des liaisons peptidiques qui aboutissent à de longues chaînes macromoléculaires appelées peptides. Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Caractérisation Collagène -- Analyse Cuir et peau de Yak Enzymolyse Extraction (chimie) Peptides Poids moléculaires Radicaux libres -- Identification Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, yak hide was used as the raw material to prepare collagen-derived peptides (YCDP) with high free radical scavenging activities (FRSA) via enzymolysis. The enzymolysis conditions were optimised via a single-factor experiment and response surface methodology (RSM) using the FRSA as the optimisation index. The optimal enzymolysis conditions were as follows: the optimal enzyme was alkaline protease, the enzymolysis pH was 8.7, the dosage of alkaline protease was 8000U/g, the temperature was 50°C, the time was 5 hours, the concentration of substrate was 5%. The FRSAs of hydroxyl, DPPH and superoxide anion radicals of the optimally prepared YCDP could be up to 39.63%, 71.08% and 69.93%, respectively, which were higher than those of CDP prepared from cattle hide under the same conditions. Further identification analyses showed that the components of YCDP with lower molecular weight contributed more to the FRSA of YCDP. Note de contenu : - MATERIALS AND METHODS : Materials - Pre-treatment of yak hide - Optimisation for the preparation of YCDP - Purification of YCDP - Characterisation - RESULTS AND DISCUSSION : Optimisation of enzymolysis conditions - Composition and activity features of YCDP - Table 1 : Levels of factors chosen for response surface experiment - Table 2 : Response surface analysis design and results - Table 3 : ANOVA of response surface quadratic model - Table 4 : Molecular weight and content properties of the ultrafiltration fractions - Table 5 : Amino acid composition of YCCP and CCCP En ligne : https://drive.google.com/file/d/1nsvB0FVDUeE9p7n-ufu1CrCDUZwadjRN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37486 [article]

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Graphene oxide modified dye : Preparation and its application in the gyeing of biomass-derived aldehyde-tanned chrome-free leather / Song Guo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 9 (09/2023)  

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Insight into the correlations between fiber dispersion and physical properties of chrome tanned leather / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)  

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Investigation of the synthesis of a novel glycidyl ether-amine epoxy tanning agents and their tanning performance / Xiaoyan Pang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 6 (06/2019)  

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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)  

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Preparation of aerogel and its application progress in coatings : a mini overview / Berhanu Telay Mekonnen in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

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Preparation of oxidised polyvinyl alcohol using hydrogen peroxide and its application for collagen modification / Baohua Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)

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Suitability of pore measurement methods for characterizing the hierarchical pore structure of leather / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 2 (02/2019)  

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