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Bletilla striata polysaccharide modified collagen fiber composite sponge with rapid hemostasis function / Xingyu Yan in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
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Titre : Bletilla striata polysaccharide modified collagen fiber composite sponge with rapid hemostasis function Type de document : texte imprimé Auteurs : Xingyu Yan, Auteur ; Yining Chen, Auteur ; Weihua Dan, Auteur ; Nianhua Dan, Auteur ; Zhengjun Li, Auteur Année de publication : 2022 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biopolymères
Caractérisation
Collagène
Composites à fibres
Polymères en médecine
Polysaccharides microbiensIndex. décimale : 668.9 Polymères Résumé : Emergencies often result in uncontrollable bleeding, which is thought to be the leading cause of death at the scene of the injured. Among various hemostasis scenarios, collagen fiber (CF) is gradually replacing traditional hemostatic materials due to its superior properties and ease of sourcing from animals. Herein, we use CF and the natural herbaceous Bletilla striata as raw materials to prepare a collagen fiber-oxidized Bletilla striata composite hemostatic sponge (CFOB). During the cross-linking process, the triple helix structure of collagen stays intact, and its porous three-dimensional network structure brings excellent bulkiness and water absorption properties. Experiments show that the optimal amount of sponge CFOB-10, namely oxidized Bletilla striata polysaccharide 0.5 mg/mL and CF 5 mg/mL, only needed 25 ± 4.06 s for hemostasis time in the rat liver hemorrhage model. In addition, CFOB meets the safety performance requirements of cytotoxicity classification standard 0. Therefore, the optimal amount of CFOB is an excellent new hemostatic material with application potential. Note de contenu : - EXPERIMENTS AND METHODS : Experimental instruments and equipment - Main reagents and materials - Preparation method - Characterization method
- RESULTS : FT-IR spectra measurements - CD spectral analysis - Differential scanning calorimetry (DSC) - AFM and SEM - Determination of water absorption and porosity ratio - Hemolysis assay - Activated partially thromboplastin time (APTT), prothrombin time (PT) and thrombin time (TT) - Evaluation of cell compatibility - Whole-blood clotting assay (CT) - Blood clotting assay in vitro - Evaluation of in vivo hemostatic performance - Analysis of coagulation mechanism and synergyDOI : https://doi.org/10.1186/s42825-022-00079-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00079-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37573
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 15 p.[article]A chrome-free combination tanning strategy : based on silicic acid and plant tannin / Zetian Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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Titre : A chrome-free combination tanning strategy : based on silicic acid and plant tannin Type de document : texte imprimé Auteurs : Zetian Zhang, Auteur ; Yang Liu, Auteur ; Junchao Wang, Auteur ; Taoling Xie, Auteur ; Liying Sun, Auteur ; Zhengjun Li, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Caractérisation
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Eaux usées -- Analyse
Humidité -- Absorption:Eau -- Absorption
Silicique, Acide
Stabilité au stockage
Stabilité thermique
Tanins végétaux
Tannage chrome free
Tannage combinéLe 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 œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Silicic acid, commonly derived from cheap and easily available sodium silicate, has recently received great attention for application in leather industry to produce ecological leather with a cleaner approach. However, leather tanned with silicic acid alone is poor in storage stability, which limits its practical application in leather production. In this work, a new environment-friendly combination tannage based on silicic acid and plant tannin was developed to address this issue along with improving the comprehensive performances of leather. The obtained leather was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and so on. The results showed that compared with leather tanned with silicic acid alone, the leather tanned with this combination method possessed improved thermal stability, enhanced mechanical properties, acceptable softness, appropriate hydrophilicity, and especially enhanced storage stability. More importantly, the combination tanned leather with 1:1 of the mass ratio of silicic acid to vegetable tannin (composed of valonea extract and mimosa extract with the same weight) had more prominent comprehensive performances. In addition, the results demonstrated that hydrogen bonding played an important role in the combination tanning process. Furthermore, the hydrogen bonds generated between phenolic hydroxyl groups of polyphenols with silicon hydroxyl groups of silicic acid molecules inhibited the excessive condensation of Si-OH groups between themselves. Subsequently, the assessment of environmental impact revealed the value of BOD5/COD of the wastewater produced in this combination tanning process is more than 0.3, indicating the chrome-free combination tannage based on silicic acid and plant tannin was an environment-friendly tanning technology. These findings therefore indicated that a new chrome-free tanning method with silicon and biomass materials as main tanning agents has potential practical application prospect in leather production. Note de contenu : - EXPERIMENTAL : Materials - Tanning process - Characterization
- RESULTS AND DISCUSSION : Thermal stability - Physical and mechanical properties - Water absorption and contact angle - Porous structure and micromorphology - Chemical structure characterization - Waste water assessment
- Table 1 : Silicic acid-vegetable tannin combination tanning process
- Table 2 : Shrinkage temperature of the samples
- Table 3 : Weight loss rate and Tmax of the samples at different storage time
- Table 4 : Analysis results of tannery wastewaterDOI : https://doi.org/10.1186/s42825-021-00058-z En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00058-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37541
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p.[article]A comparison of low temperature softness of leather lubricated with various types of fatliquor / Zhengjun Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)
[article]
Titre : A comparison of low temperature softness of leather lubricated with various types of fatliquor Type de document : texte imprimé Auteurs : Zhengjun Li, Auteur ; Fan Wuhou, Auteur ; Yang Qinhuan, Auteur ; Tian Ye, Auteur Année de publication : 2014 Article en page(s) : p. 167-171 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Cuir
Douceur (toucher)
Huile de colza
Huiles et graisses
LécithineLa phosphatidylcholine est plus connue sous le nom lécithine.
Au sens le plus strict, la lécithine désigne uniquement les phosphatidylcholines c'est-à -dire un lipide formé à partir d'une choline, d'un phosphate, d'un glycérol et de deux acides gras (figure). Dans ce contexte, il serait plus juste de parler des lécithines, car il ne s'agit pas d'une seule molécule mais d'un groupe dont la composition en acide gras varie d'une molécule à l'autre. Ainsi, les lécithines vont adopter diverses couleurs selon leur composition : du jaune, pour la lécithine végétale, au brun, pour la lécithine de poisson.
Le terme de lécithine est aussi utilisé par extension pour désigner l'ensemble des phospholipides extraits du vivant (par exemple le soja), dans la mesure où ils sont majoritairement constitués de phosphatidylcholine.
Polyéther de silicone
Produits de nourriture du cuirIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fatliquors are some of the most effective chemicals to impart softness and flexibility to leather, and low temperature softness of leather is very important for the application of leather in a low temperature environment. The main objective of the present work is to compare low temperature softness of leather lubricated with various types of fatliquors. In this work, a softness tester and dynamic mechanical analysis were used to investigate the softness variation of leather which was lubricated with different types of fatliquors, such as polyether silicone, sulphonated rapeseed oil, modified soybean lecithin and so on, at temperatures within the range of -15°C to 25°C. The results indicate that the smallest variation in softness ratio is shown by polyether oil lubricated leather and imply that silicone oil is superior to sulphonated rapeseed oil and modified lecithin for manufacturing a leather with excellent low temperature softness. Therefore there is great value in effectively utilizing silicone oil as a main component in fatliquoring agents to meet the new growing demand for low temperature softness of leather. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and processing procedure - Dynamic mechanical analysis (DMA)
- RESULTS AND DISCUSSIONS : Softness - Dynamic mechanical analysis (DMA)En ligne : https://drive.google.com/file/d/159GSc85LS_o4V4iyQBkpDLNNzmJiJWuw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21817
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 4 (07-08/2014) . - p. 167-171[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16445 - Périodique Bibliothèque principale Documentaires Disponible Improvement in tanning properties of natural leather through surface modification assisted by CO2 low-temperature plasma / Fangming Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)
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Titre : Improvement in tanning properties of natural leather through surface modification assisted by CO2 low-temperature plasma Type de document : texte imprimé Auteurs : Fangming Liu, Auteur ; Yuanping Jiang, Auteur ; Wenlan Xu, Auteur ; Zhengjun Li, Auteur ; Li Lixin, Auteur Année de publication : 2018 Article en page(s) : p. 26-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome trivalent -- Absorption
Cuirs et peaux
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Stabilité hydrothermale
Tannage au chrome
Technique des plasmas
Traîtements de surface
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Low temperature plasma (LTP) technology is a green, solvent-free, clean, efficient environment-friendly surface treatment technology. The pioneering works were carried out by applying LTP to surface modification of natural leather in order to improve the chrome tanning exhaustion rate. The effects of different treatment time on tanning exhaustion rate, micro-structure, chemical compositions, mechanical and organoleptic properties of leather were studied. The optimal CO2 plasma treatment time is about 10 min, at which the chrome tanning exhaustion rate increases from 78.49% to 91.82% compared with untreated leather. The SEM results show that some micro-pores, fissures, deep ravines and filamentous fibers can be observed due to the surface etching effect. From the XPS analysis, compared with the untreated leather, the O1s concentration and the O1s/C1s ratio of the 10min LTP modified leather both increase from 18.75% to 28.85% and from 0.258 to 0.479, respectively. The results show that appropriate LTP process can effectively improve the chrome tanning exhaustion rate, which reduces the emission of heavy metal chromium in waste liquor and also has a good synergistic effect on improving the comprehensive performance of leather such as hydrothermal stability, physical-mechanical and organoleptic properties. The LTP modification technology may be a new potential method for cleaner high-exhaustion chrome tanning technology. Note de contenu : - EXPERIMENTAL : Materials - LTP treatment - Chrome tanning - Characterization and performance test - Mechanical properties test - Organoleptic properties test
- RESULTS AND DISCUSSION : The effect of LTP treatment on chrome tanning absorption rate and the hydrothermal stability of wet blue - Surface morphology observation of leather - XPS analysis - The mechanism of applying LTP technology to tanning process - Mechanical property - Organoleptic propertyEn ligne : https://drive.google.com/file/d/1EM7noWdiA1YqRbHNmjib-7EZiGTBA5kg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29749
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 1 (01/2018) . - p. 26-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19487 - Périodique Bibliothèque principale Documentaires Disponible Inside into understanding incorporation of glycidoxypropyltrimethoxysilane for improving hydrothermal stability and porous structure of silicic acid tanned leather / Zetian Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 8 (08/2019)
[article]
Titre : Inside into understanding incorporation of glycidoxypropyltrimethoxysilane for improving hydrothermal stability and porous structure of silicic acid tanned leather Type de document : texte imprimé Auteurs : Zetian Zhang, Auteur ; Jun Liu, Auteur ; Junchao Wang, Auteur ; Zhengjun Li, Auteur Année de publication : 2019 Article en page(s) : p. 300-312 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 3-Glycidoxypropyltrimethoxysilane
Cuirs et peaux -- Analyse
Dénaturation (chimie)
Essais accélérés (technologie)
Porosité
Stabilité hydrothermale
Tannage combinéLe 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 œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage synthétique
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tanning with silicic acid, a kind of silicon-containing materials, is considered as a more environmentally benign process; however, the obtained leather would become stiff and brittle during storage in spite of possessing acceptable shrinkage temperature (Ts). Herein, we incorporated organosilicon material attaching silicon atoms with T linkage structure (e.g. glycidoxypropyltrimethoxysilane, GPTMS) in the leather-making process to investigate hydrothermal stability and porous structure, in particular their variation along with different storage time, through Ts determination, DSC analysis, SEM observation and SEM-EDS test. The results confirmed that the introduction of GPTMS stabilized properties of the resultant leather during accelerated ageing process, which may be ascribed to that GPTMS could prevent silicon hydroxyl groups existing in collagen fiber matrix from further condensation. Besides, the tanning mechanism of chrome-free tanning agent based on silicon materials such as silicic acid and GPTMS was investigated preliminarily by means of FT-IR and XPS analysis, indicating hydrogen bonds between silicon hydroxyl groups and amino groups in collagen molecules, and the covalent bonding formed by epoxy group of GPTMS and carboxyl groups of collagen fibers are beneficial to improvement of the properties of silicon-based materials tanned leather. These findings provide an effective and promising strategy to control condensation of silicon hydroxyl groups, and are of great significance to the development of a chrome-free tanning technology based on silicon materials. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the silicic acid solution - Tanning process and accelerated ageing test of leather samples selection of tanning conditions - Addition of GPTMS and accelerated aging test - Test of the shrinkage temperature - Test of the denaturation temperature - Measurement of the total porosity - SEM observation and SEM-EDS analysis - FT-IR measurement - XPS measurement
- RESULTS AND DISCUSSION : Optimization of parameters in silicic acid tanning process - Effect of GPTMS on stability and porous structure of leather - Effect of GPTMS and accelerated ageing on stability of leather - Effect of GPTMS and accelerated ageing on porous structure of leather - Preliminary research of tanning mechanismEn ligne : https://drive.google.com/file/d/1CaTbsbMP4-jjhiCVqGzSvRDqH_qdpHej/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32790
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 8 (08/2019) . - p. 300-312[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21087 - Périodique Bibliothèque principale Documentaires Disponible Interaction between amphoteric polymer and silicic acid tanned leather : Ingenious regulation of ph based on isoelectric point / Ze Liang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 10 (10/2023)
PermalinkPolycaprolactone strengthening keratin/bioactive glass composite scaffolds with double cross-linking networks for potential application in bone repair / Liying Sun in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
PermalinkSynthesis and application of a novel functional material as leather flame retardant / Li Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 7 (07/2014)
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