Accueil
Détail de l'auteur
Auteur Bi Shi
Commentaire :
Sichuan University - Chengdu - China
|
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
Near infrared and two-dimensional correlation infrared spectroscopic study on the heat denaturation of collagen in aqueous solution / Junling Guo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 6 (06/2012)
[article]
Titre : Near infrared and two-dimensional correlation infrared spectroscopic study on the heat denaturation of collagen in aqueous solution Type de document : texte imprimé Auteurs : Junling Guo, Auteur ; Wenhua Zhang, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2012 Article en page(s) : p. 205-212 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Détérioration
Cuirs et peaux
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Solutions aqueuses (chimie)
Spectroscopie infrarouge procheIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The thermal behaviors of collagen in aqueous solution were studied by in situ near infrared spectroscopy (NIR) and two-dimensional correlation infrared spectroscopy (2D-IR). The spectral data of water molecule and Amide I region fairly provided the dynamic details about the changes of water molecules and imino groups (–NH) in collagen under a temperature evolution from 25 to 54 °C. The splitting of combination bands of water molecule separately at 1455 nm and 1395 nm revealed that there are two different states of water molecules in collagen molecule, the surrounding free water molecules and the structural participating water molecules. Additionally, the two-step phase shift of the combination band of water molecule suggested that the interaction between collagen and water molecule experience two significant changes during the process of thermal denaturation transition. Based on the study of NIR and 2D-IR, a novel molecular model about the micro-changes of collagen from native to thermally denatured state was proposed. In this model, the breaking of hydrogen-bonded –NH groups occurs at first upon heating and the released –NH groups form hydrogen bonds with water molecules immediately to build a new stable water-mediated hydrogen-bonding structure simultaneously. With the increase of temperature, the collagen triple helix collapses gradually, accompanied by the breaking of water-mediated hydrogen bonds of inter-triple helix at 36 °C, and the breaking of intra-helix hydrogen bonds at 48 °C. Note de contenu : - EXPERIMENTAL : Materials - Near Infrared Spectroscopy measurements - Temperature-dependent two-dimensional correlation analysis
- RESULTS AND DISCUSSION : Temperature-dependent near Infrared Spectroscopy Analysis - Two-dimensional correlation analysis of the temperature-dependent micro-dynamic changesEn ligne : https://drive.google.com/file/d/1QYgkNYTxh4KJlvZNWbXd5gtyZq4tbTZ3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15534
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 6 (06/2012) . - p. 205-212[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 13991 - Périodique Bibliothèque principale Documentaires Disponible Neutral protease assisted low-sulfide hair-save unhairing based on pH-sensitivity of enzyme / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 9 (09/2016)
[article]
Titre : Neutral protease assisted low-sulfide hair-save unhairing based on pH-sensitivity of enzyme Type de document : texte imprimé Auteurs : Yunhang Zeng, Auteur ; Qian Yang, Auteur ; Ya-Nan Wang, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2016 Article en page(s) : p. 345-353 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaux
Cuirs et peaux de bovins
Epilage enzymatique
Peptidases
Sulfure de sodiumIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The mass transfer of protease in hide during enzymatic unhairing was first investigated by fluorescent tracer technique. It was found that the penetration rate of protease in hide was quite slow, and protease remained on the grain/papillary layer even after removal of hair, which is the main reason why enzymatic unhairing may cause grain damage or loose grain. But protease could effectively remove epidermis in a short time. From these phenomena, we developed an enzyme assisted low-sulfide hair-save unhairing (EALS unhairing) based on pH-sensitivity of neutral protease activity. To avoid risk of hide damage, soaked cattle hide (pH 8) was first treated with neutral protease (20 units/g hide) for 40 min at 22°C to cleave epidermis but not to unhair, and then 1% lime was immediately added both for inactivation of the neutral protease (pH>12) and for hair immunization. Finally, the hide was completely unhaired by using 0.8% sodium sulfide with intact hair shaft. The smartly controlled action of protease, as well as the synergistic effect of protease, lime and sulfide, ensured the complete removal of hair and epidermis with reduced offer of chemicals, and prevented pelts from defects. The crust leather processed by using EALS unhairing had a cleaner grain surface compared with that using conventional sulfide-lime unhairing. Additionally, the physical properties of the leather processed with EALS unhairing were comparable to those of conventional leather. Sulfide, total solids, suspended solids and chemical oxygen demand in the EALS unhairing effluent were markedly reduced due to a dramatic decrease in the input of sodium sulfide and lime as well as the recovery of hair. Note de contenu : - EXPERIMENTAL : Materials - Visualization and quantification of protease in cattle hide during enzymatic unhairing - Effect of enzymatic unhairing time on damage to hide collagen - Effect of pH on proteolytic activity on neutral protease - Effect of pH on hydrolysable action of neutral protease on collagen fiber - Comparison between low-sulfide hair unhairing (LS unhairing) and enzyme assisted low-sulfide hair-save unhairing (EALS unhairing) - Comparison between conventional sulfide-lime unhairing and EALS unhairing
- RESULTS AND DISCUSSION : Penetration of protease in hide during enzymatic unhairing - Enzyme assisted low-sulfide hair-save unhairing (EALS unhairing - Comparison of conventional sulfide-lime unhairing and EALS unhairingEn ligne : https://drive.google.com/file/d/1bgCly-2SyNUBAWzubdqkDIuxdO4UeG2z/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26921
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 9 (09/2016) . - p. 345-353[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 18288 - Périodique Bibliothèque principale Documentaires Disponible Non-ammonia deliming using sodium hexametaphosphate and boric acid / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 9 (09/2011)
[article]
Titre : Non-ammonia deliming using sodium hexametaphosphate and boric acid Type de document : texte imprimé Auteurs : Yunhang Zeng, Auteur ; Jiahong Lu, Auteur ; Xuepin Liao, Auteur ; Qiang He, Auteur ; Bi Shi, Auteur Année de publication : 2011 Article en page(s) : p. 257-263 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Borique, Acide
Cuirs et peaux -- Analyse
DéchaulageOpération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage.
Eaux usées -- Analyse
Hexamétaphosphate de sodium
Sels d'ammoniumIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of ammonium salt in the deliming process is the primary reason for high ammonia nitrogen content in tannery wastewater. To reduce ammonia nitrogen pollution, a composite of sodium hexametaphosphate (SHMP) and boric acid (BA) was employed for non-ammonia deliming. The synergistic effect of SHMP and BA on deliming of limed cattle hide was investigated by analyzing the pH of deliming liquor, the extent of removal of calcium in pelt and the concentration of total nitrogen (TN) in the effluent. The experimental results indicated that the lowest pH of float during SHMP and BA deliming process was 7.08 and the concentration of hydroxyproline in the deliming liquor was lower than that of ammonia sulfate deliming, which suggest that deliming by SHMP and BA can reduce the damage of pelts. The extent of calcium removal from pelts delimed by using 3 % SHMP and 1 % BA was comparable to that of the pelts delimed with 3.5 % ammonium sulfate. FESEM images and EDS analysis indicated that the deliming by SHMP and BA produced clearer grain with less calcium salts. Compared with ammonium sulfate deliming, TN concentration in SHMP and BA deliming float was reduced by 85 %. Note de contenu : EXPERIMENTAL METHODS : Materials - Deliming processes - Analyses of effluents and pelts - Estimation methods : Determination of Hyp concentration - Determination of TN and TOC concentrations - Determination of calcium content and extent of calcium removal
RESULTS AND DISCUSSION : pH of deliming liquors - Extent of calcium removal from pelts - TN and TOC in deliming effluentsEn ligne : https://drive.google.com/file/d/1ZobH-Rc22M3p5Es6l9D_Tz1bQE6X-VMq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11887
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 9 (09/2011) . - p. 257-263[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 13284 - Périodique Bibliothèque principale Documentaires Disponible A novel chromium-free tanning process based on in-situ melamine-formaldehyde oligomer condensate / Xue Bai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 11 (11/2013)
[article]
Titre : A novel chromium-free tanning process based on in-situ melamine-formaldehyde oligomer condensate Type de document : texte imprimé Auteurs : Xue Bai, Auteur ; Jinming Chang, Auteur ; Chen Yi, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2013 Article en page(s) : p. 404-410 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Azote total
Carbone organique total
Condensation
Copolymère mélamine-Formaldéhyde
Cuirs et peaux de chèvres
Microscopie électronique à balayage
Oligomères
Oligomères conjugués
Point isoélectriqueEn biochimie, le point isoélectrique (pI) ou potentiel hydrogène isoélectrique (pHI) est le pH auquel une molécule est sous forme d'ion mixte ou, en physico-chimie, le pH d'une solution aqueuse dans laquelle un solide existe sous un potentiel électrique neutre.
En physico-chimie : Selon Bolger, le caractère acide ou basique d'une surface s'exprime par son point isoélectrique " Is ou IEPS (Iso Electric point for the surface) " ou point de charge nulle " PCN ou PZC (Point of Zero Charge) ", défini comme étant le pH de la solution aqueuse dans laquelle le solide existe sous un potentiel électrique neutre. Si le pH de la solution est basique, la surface est acide, et inversement. La différence entre le PZC et l'IEPS est basée sur le phénomène d'adsorption spécifique. On peut considérer que si la grandeur mesurée ne dépend pas de la solution utilisée pour la mesurer (pH, concentration, nature des ions), alors on a affaire à un PZC. Dans le cas contraire, c'est un IEPS que l'on mesure. Par exemple, quand la mesure de goutte sessile à deux liquides est utilisée, on considère en général qu'il n'y a pas adsorption des ions de cette goutte et que la goutte déplace complètement l'alcane qui sert de deuxième liquide: on est alors en présence d’un PZC. Au contraire, dans les mesures de potentiel d'écoulement (streaming potential), la solution joue un rôle important et c'est un IEPS que l'on mesure. Enfin, la charge nette se définit grâce au pH de la solution aqueuse dans laquelle la surface métallique existe, dans un état électriquement neutre (c’est-à -dire [M-OH2+ surf]=[M-O- surf]) et au PZC.
- Si pH < PZC alors la charge nette est positive
- Si pH > PZC alors la charge nette est négative.
Il existe plusieurs méthodes expérimentales permettant de décrire l’état acido-basique de la surface : la mesure du potentiel d’écoulement, la photoélectrochimie, la mesure de l’angle de contact, et la spectroscopie XPS.
Réticulation (polymérisation)
Stabilité hydrothermale
ThermogravimétrieIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : To manage the environmental impacts of chrome tannage, a burgeoning option lies in seeking alternatives that reproduce the high hydrothermal stability and retain the versatility of chromium salts. In this study, a novel chromium-free tanning process based on in-situ condensate melamine-formaldehyde oligomer was reported. Instead of using prepared melamine-formaldehyde syntan, which inevitably contained post-condensates with compromised penetration capability and reactivity, melamine and formaldehyde monomers were first allowed to penetrate evenly into bated hides and then condensation was triggered in-situ. Total organic carbon (TOC), total nitrogen (TN), Fourier transform infrared (FTIR), and isoelectric point (IP) analysis demonstrated these in-situ condensate oligomers covalently reacted with amino or hydroxyl residues, introducing rigid and stable chemical crosslink between collagen chains. Consequently, the hydrothermal stability of the tanned leather was significantly enhanced, evidenced by thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) and a shrinking temperature (Ts) approaching 93°C. In addition, scanning electron microscope (SEM) observation indicated that the in-situ tanned leather exhibited smoother grain, more even and much looser fiber structure compared with control, which was tanned by traditional melamine-formaldehyde syntan. According to these results, the in-situ condensation strategy developed in this study could be employed as an efficient chromium-free tannage, which eliminated the adverse effects of post-condensates in traditional melamine-formaldehyde syntan while exhibiting improved tanning efficiency. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of modified gelatin - TOC and TN measurements - FTIR analysis - IP measurements - TGA analysis - Tanning of bated goat hides - The hydrothermal stability - Scanning Electron Microscope (SEM) observation
- RESULTS AND DISCUSSION : Tanning mechanism - Hydrothermal stability - Morphologies of fibers in the tanned leatherEn ligne : https://drive.google.com/file/d/15ZHAPD8Iu0e-UnTmXSZXuPEWRsw24vZu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19685
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 11 (11/2013) . - p. 404-410[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 15707 - Périodique Bibliothèque principale Documentaires Disponible A novel oxazolidine tanning agent and its use in vegetable combination tanning / Jing Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 4 (07-08/2011)
[article]
Titre : A novel oxazolidine tanning agent and its use in vegetable combination tanning Type de document : texte imprimé Auteurs : Jing Li, Auteur ; Sun Qingyong, Auteur ; Chao Wu, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2011 Article en page(s) : p. 165-170 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mimosa et constituants
Oxazolidine
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 organique
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Combination tanning using vegetable tannins and oxazolidine E has been proved to be preferred alternative to chrome tanning. But this kind of tannage has not been widely applied partly owing to the high price of oxazolidine E. In this study, a new oxazolidine tanning agent, Oxazolidine SCU, was synthesized by using cheap and readily obtained raw materials, and its tanning properties both alone and in combination with vegetable tannins, were investigated. Oxazolidine SCU possesses high reactivity with skin collagen. Tanned by 5 % oxazolidine SCU under room temperature at pH8.0, the shrinkage temperature of goatskin leather was around 83°C. In vegetable combination tanning, oxazolidine SCU exhibited a good synergistic tanning effect with condensed tannins. Among condensed tannins, mimosa is the preferred one in consideration of achieving high shrinkage temperature of leather. Tanning the depickled pelt with 10-15 % vegetable tannin at first, and then retanning with 4-6 % oxazolidine SCU for 4 hours at 60°C in the pH range 5.5-6.0, the shrinkage temperature of leather was 114-120°C. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials and instruments - Effect of tanning conditions on vegetable tannin-oxazolidine SCU combination tanning - Shrinkage temperature determination
- RESULTS AND DISCUSSION : Hydrolysis of oxazolidine SCU - Effect of tanning conditions on tanning property of oxazolidine SCU - Effect of tanning conditions on vegetable tannin-oxazolidine SCU combination tanningEn ligne : https://drive.google.com/file/d/1MQ9SW_udQTqwBWd5mGhdxqHM1IVNomnb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11860
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 4 (07-08/2011) . - p. 165-170[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 013212 - Périodique Bibliothèque principale Documentaires Disponible A novel pre-tanning agent for high exhaustion chromium tannage / Luan Shifang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 4 (07-08/2007)
PermalinkNovel titanium (IV) tanning for leathers with superior hydrothermal stability / Biyu Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)
PermalinkNovel titanium (IV) tanning for leathers with superior hydrothermal stability / Biyu Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 10 (10/2007)
PermalinkNutrient balance in aerobic biological treatment of tannery wastewater / Jianfei Zhou in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 5 (05/2014)
PermalinkOxidative dechroming of leather shavings under ultrasound / Danhong Sun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 3 (05-06/2003)
PermalinkOxidising degradation of Valonia extract and utilisation of the products. Part 1. Oxidising degradation of Valonia extract and characterisation of the products / Bi Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 6 (11-12/2000)
PermalinkOxidising degradation of Valonia extract and utilisation of the products. Part 2. Combination tannages of degraded product using 10% H2O2 with Cr(III) and AI(III) / Bi Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 1 (01-02/2001)
PermalinkOxidized maltodextrin : A novel ligand for aluminum-zirconium complex tanning / Xueru Guo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 5 (05/2021)
PermalinkOxidizing degradation of Valonia extract and utilization of the products - Part 3 : Auxiliary tanning effects of degraded producs using 20% and 30% H202 / Ying Di in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 5 (09-10/2001)
PermalinkOxygen plasma treated polyurethane leather coating with enhanced water vapour permeability / Chen Yi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 5 (09-10/2010)
PermalinkPhosphorylated collagen fibre : preparation and use for adsorbing heavy metals / Jiao Limin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)
PermalinkPhysicochemical properties of collagen, gelatin and collagen hydrolysate derived from bovine limed split waste / Zhongkai Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 1 (01-02/2006)
PermalinkA polyurethane-based retanning agent with fluorescent effect / Saiqi Tian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 4 (04/2016)
PermalinkPreparation of formaldehyde-free melamine resin using furfural as condensation agent and its retanning performances investigation / Zhou Ji-Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)
PermalinkPreparation of lignosulfonate reduced chrome tanning agent and its tanning effect / Peng Zhou in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 4 (07-08/2011)
Permalink