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Use of computer-generated models in studies of modified collagen / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 6 (06/1996)
[article]
Titre : Use of computer-generated models in studies of modified collagen Type de document : texte imprimé Auteurs : Eleanor M. Brown, Auteur ; Gregory King, Auteur Année de publication : 1996 Article en page(s) : p. 161-170 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Cuirs et peaux
Molécules -- Modèles
Simulation par ordinateurIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Production of leather from cattlehide is accomplished by the introduction of crosslinks between collagen triplehelices, microfibrils and fibrils. Present tanning technology uses chromium complexes to form crosslinks between acidic aminoacid side chains. Pretanning treatments that modify the primary amino groups of collagen have been reported to increase the efficiency of chrome tanning. To aide the effectiveness and efficiency of research leading to improved tanning technology, we have examined a fragment of our previously reported three dimensional model of the collagen microfibril.This 281 residue fragment of the microfibril model contains 15 lysine residues and 28 acidic residues distributed over the microfibril's 15 peptide chains. The effects of reductive alkylation and deamination of the lysine residues were simulated. Five independent binding sites in which carboxyl groups were located 7 to 11 Angström were indentified and a sphere of 8 Angström radius about the midpoint of each pair was isolated. The sites examined provide for the possibility of inter and intra microfibrillar stabilization. En ligne : https://drive.google.com/file/d/1tAZW6ISSgdVgJkto4EN_sILi8ZHq3sG0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7794
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 6 (06/1996) . - p. 161-170[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006945 - Périodique Bibliothèque principale Documentaires Disponible Utilization of chromium-tanned leather solid wastes in microencapsulation / Bugra Ocak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)
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Titre : Utilization of chromium-tanned leather solid wastes in microencapsulation Type de document : texte imprimé Auteurs : Bugra Ocak, Auteur ; Ahmet Aslan, Auteur ; Gürbüz Gülümser, Auteur Année de publication : 2011 Article en page(s) : p. 232-238 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Cuir -- Déchets
Encapsulation
Fourier, Spectroscopie infrarouge à transformée de
Glutaraldéhyde
Huile essentielle de lavande
Hydrolysats de protéines
Microscopie électronique à balayage
Récupération (Déchets, etc.)
Recyclage (déchets, etc.)
Tannage au chromeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this research, solid collagen-based protein hydrolysate was isolated from chromium-tanned leather wastes and its chemical properties were determined. After that, the use of collagen hydrolysate (CH) was investigated as a polymeric wall material in the microencapsulation process. The effects of variations in concentrations of CH, lavender oil (LO) and glutaraldehyde (GA), which were used during the microencapsulation process, on the oil load of microcapsules, oil content, encapsulation efficiency and release rate of oil were determined. The morphological structure of the microcapsules was investigated using optical and scanning electron microscopes (SEM). It was determined by FTIR studies that there was no evidence for any significant interaction between CH and LO. Note de contenu : MATERIALS AND METHODS : Preparation of collagen hydrolysate - Phase separation behaviour of collagen hydrolysate - Preparation of microcapsules - Determination of some chemical characteristics of collagen hydrolysate - Calibration curve of lavender oil - Determination of the oil load, oil content and encpsulation efficiency - Oil release studies - Optical and scanning electron microscopy studies - FTIR study.
RESULTS AND DISCUSSION : Some chemical characteristics of collagen hydrolysate - The effect on microcapsules of variations in oil concentration - Effects of variation of hydrolysate concentration - The effect of variation in glutaraldehyde concentration - Optical and scanning electron microscopic studies - Fourier Transform Infrared (FTIR) study.En ligne : https://drive.google.com/file/d/1vpL-zU-enBe_sD-OaV0OOevqpaXvpKVM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12033
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011) . - p. 232-238[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013127 - Périodique Bibliothèque principale Documentaires Disponible Utilization of tannery solid waste : Dry strength additive for papermaking / Yaohui You in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
[article]
Titre : Utilization of tannery solid waste : Dry strength additive for papermaking Type de document : texte imprimé Auteurs : Yaohui You, Auteur ; Yunhang Zeng, Auteur ; Yishan Liu, Auteur ; Bi Shi, Auteur ; Xuepin Liao, Auteur Année de publication : 2013 Article en page(s) : p. 250-256 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs
Ammonium
Cations
Collagène
Cuirs et peaux -- Déchets -- Recyclage
Hydrolysats de protéines
Papier
Papier -- Propriétés mécaniques
Procédés de fabrication
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An approach of utilizing tannery solid waste was developed by using untanned solid waste as raw material to prepare a dry strength additive for papermaking. Cationic derivatives of collagen hydrolysate (C-CHs) were prepared by incorporating (2,3-epoxypropyl) trimethyl ammonium chloride into collagen hydrolysates with different molecular weights. C-CHs were employed in sheet formation for enhancing physical properties of hand-sheets, and the results indicated that C-CHs were useful in tap water and white water to improve the tensile strength and folding endurance of the hand-sheets. This should be due to the fact that C-CHs with cationic moieties are prone to be retained in anionic cellulose fibers, which is beneficial for the formation hydrogen bonds among hydroxyl groups in the cellulose fibers. Note de contenu : - EXPERIMENTAL : Materials - Preparation of CHs with different molecular weights - Cationization of CHs to obtain C-CHs - Effectiveness of C-CHs in sheet formation
- RESULTS AND DISCUSSION : characteristics of C-CHs - Effectiveness of C-CHs in sheet formationEn ligne : https://drive.google.com/file/d/11rFGXylHlX9eyLITVAEw2vFxg9Y-XQvX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19009
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 7 (07/2013) . - p. 250-256[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15337 - Périodique Bibliothèque principale Documentaires Disponible Viscosity properties of collagen solutions : influence of pH, salt type and salt concentration / Kai Lei in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : Viscosity properties of collagen solutions : influence of pH, salt type and salt concentration Type de document : texte imprimé Auteurs : Kai Lei, Auteur ; Yulong Li, Auteur ; Congde Qiao, Auteur ; Tianduo Li, Auteur Année de publication : 2018 Article en page(s) : p. 137-140 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène
Cuirs et peaux
Lumière -- Diffusion
Mesure
pH
Solutions (chimie)
ViscositéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, the effects of pH, salt type, and salt concentration on the viscosity behaviour of collagen solutions were investigated by a photoelectric viscometer. The results show that the viscosity behaviour as polyelectrolytes or polyampholytes depended on the charge distribution on the polypeptide chains, which can be tuned by the value of pH of the collagen solution. The intrinsic viscosity of collagen in Na2SO4 solution at pH2.0 first decreases and then increases with increasing salt concentration, while a monotonic decrease of the intrinsic viscosity of collagen is observed in NaCl solution. The intrinsic viscosity of collagen in Cr(OH)SO4 solution at pH4.0 is found to be increased first and then decreased with an increase in salt concentration, whereas an opposite trend is observed in same solution at pH2.0. We suggest that the complicated viscosity behaviour of collagen solution is attributed to the comprehensive effects of shielding, overcharging and crosslinking caused by the introduction of the different counterions. In addition, the viscosity result is also confirmed by dynamic light scattering (DLS) experiment. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Viscosity measurements - Measurement of dynamic light scattering (DLS)
- RESULTS AND DISCUSSION : Effect of counterion valency on the intrinsic viscosity of collagen in salt solutions - Effect of pH on the intrinsic viscosity of collagen in Cr(OH)SO4 solutions - Effect of pH on the average hydrodynamic radius (Rh) of collagen in Cr(OH)SO4 solutionsEn ligne : https://drive.google.com/file/d/1mHRj_sabaPR_JWSuEA8KzjGUOKEDncMx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30794
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 3 (05-06/2018) . - p. 137-140[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Water sorption capacity of tanned collagen fibres / K. J. Bienkiewicz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
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Titre : Water sorption capacity of tanned collagen fibres Type de document : texte imprimé Auteurs : K. J. Bienkiewicz, Auteur ; Czeslaw Krawiecki, Auteur Année de publication : 1978 Article en page(s) : p. 34-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Adsorption
Alumine
Chrome
Collagène
Cuirs et peaux
Eau
Glutaraldéhyde
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 Å“uvre par exemple Chrome-Végétal ou Chrome-SynthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Water sorption capacity of tanned, spun collagen fibres has been examined and compared with that of standard, tanned and acylated hide powders. Chromium, chromium-alumina, glutaraldehyde and combined tannages have been applied. In spite of that the applied tannages engage different functional groups-only small differences in water sorption capacity have been observed-these do not exceed 20% of total value. Note de contenu : - Tables : Sorption capacity of collagen fibres En ligne : https://drive.google.com/file/d/1iETJn5Ph3AIRJoChQimXKDLa3w_C25a3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31846
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61 et 62 (Années 1977 et 1978) . - p. 34-41[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008597 - Périodique Archives Documentaires Exclu du prêt Water sorption capacity of tanned collagen fibres / K. J. Bienkiewicz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 2 (03-04/1977)
PermalinkWaterborne dimethylolpropionic acid-diisocyanate adducts with alkali-deblockable isocyanate groups as pretanning agent for chrome tanning / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 2 (02/2015)
PermalinkWealth from tannery waste ? / Graham Lampard in LEATHER INTERNATIONAL, Vol. 214, N° 4826 (11-12/2012)
PermalinkXIII Kongress der Internationalen Union der Lederchemikere-Verbände / Union Internationale des Sociétés de Chimistes du cuir / IULCS (1973)
PermalinkXVII Congreso de la Union Internationacional de Asociaciones de Técnicos y Quimicos de la Industria del Cuero / Union internationale des sociétés de techniciens et chimistes des industries du cuir / IULTCS (1981)
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