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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
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Code-barres Cote Support Localisation Section Disponibilité 013212 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : One step tanning Type de document : texte imprimé Auteurs : Claus Reineking, Auteur Année de publication : 2013 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Cuirs et peaux
EasyWhite (tannage)
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Organically tanned leathers are continuing to grow in popularity, engendering an unparalleled level of innovation within the industry. Claus Reineking, Head of PM Wet End Chemicals of Clariant BU Leather Services, outlines how the EasyWhite Tan system is providing a platform for a more reliable and constant tanning process and an end product of consistently high quality. Note de contenu : - With EasyWhite Tan, compact and tight grain fibers deliver more fibers per mm thickness and veins also become more compact.
- With glutaraldehyde, the grain is open and fibers are looser resulting in less fibers per mm thickness, and veins are more open
- With EasyWhite Tan, compact and tight grain fibers deliver more fibers per mm thickness and veins also become more compact
- Wet blue gives an open grain with looser fibers and less fibers per mm thickness, and veins are more openEn ligne : https://drive.google.com/file/d/13ycbX4DF0MfSaFiFPp5QOPxIZpwRxLeL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19845
in LEATHER INTERNATIONAL > Vol. 215, N° 4833 (08/2013) . - p. 28-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15414 - Périodique Bibliothèque principale Documentaires Disponible Optimization and application of UVC irradiation for prevention of fungal biodeterioration of vegetable tanned and chrome tanned leather / Eshita Jhahan in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
[article]
Titre : Optimization and application of UVC irradiation for prevention of fungal biodeterioration of vegetable tanned and chrome tanned leather Type de document : texte imprimé Auteurs : Eshita Jhahan, Auteur ; Subarna Bhattacharyya, Auteur ; Anirban Chaudhuri, Auteur ; Nirmal Sarkar, Auteur ; Shaheen Akhtar, Auteur ; Punarbasu Chaudhuri, Auteur Année de publication : 2022 Article en page(s) : 14 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aspergillus
Biodégradation
Cuir
Rayonnement ultraviolet
Résistance à la traction
Tannage au chrome
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : UV-C irradiation critically effects the growth of micro-fungi and also deteriorate leather materials. In the present study vegetable tanned and chrome tanned leather were infected with pure cultures of Aspergillus niger and Aspergillus flavus, which were isolated from stored leather materials. UV-C light (λ = 254 nm) was applied on infected leather for 15 and 60 min. The changes in leather qualities were examined through weight, tensile strength, scanning electron microscope, energy dispersive X-ray and Fourier transform infrared spectroscopy study after 15 and 30 days of fungal inoculation. Vegetable tanned leather was more vulnerable in case of fungal attack than chrome tanned leather while A. flavus showed more influence on leather deterioration than A. niger. The results showed that weight loss after 30 days for 15 and 60 min irradiation exposure was 1.3% compared to A. flavus infected leather (3.93%). The tensile strength of vegetable and chrome tanned UV irradiated leather was increased by 44% and 7% respectively. The scanning electron microscopic images exhibit the limited presence of conidiophores in UV-C exposed leather which confirmed the potentiality of irradiation for controlling fungal growth. The infrared spectral analysis of UV-C exposed infected leather samples showed neither shifting of wavenumber nor displacement of any functional groups. Altogether the efficacy of UV-C irradiation against biodeterioration of leather was concluded to be effective. This method can be used to control fungal growth without compromising the leather quality. Note de contenu :
- MATERIALS AND METHODS : Isolation and identification - Biodeterioration study on leather - UV exposure study on fungal infected leather - Analysis
- RESULTS AND DISCUSSION : Weight loss measurement - Physical strength analysis - FT-IR analysis - SEM and SEM–EDX analysis - Conceptual model for UV-C irradiation
- Table 1 : Tensile strength and percentage of elongation at break of vegetable tanned leather sample
- Table 2 : Tensile strength and percentage of elongation at break of chrome tanned leather sample
- Table 3 : Elemental analysis of vegetable tanned leather sample after 30 days
- Table 4 : Elemental analysis of chrome tanned leather sample after 30 daysPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38222
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 14 p.[article]Optimization of enzyme-assisted phenolic reactions applied to thermal stabilization of collagen using response surface methodology / Leticia Melo Dos Santos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 2 (02/2016)
[article]
Titre : Optimization of enzyme-assisted phenolic reactions applied to thermal stabilization of collagen using response surface methodology Type de document : texte imprimé Auteurs : Leticia Melo Dos Santos, Auteur ; Stuart C. Allen, Auteur ; A. Paula M. Antunes, Auteur Année de publication : 2016 Article en page(s) : p. 53-61 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Catalyse enzymatique
CatéchineLa catéchine est une molécule de la famille des flavonoïdes de la sous-classe des flavanols. Elle est aussi connue sous le nom de catéchol, avec le risque de confusion avec le pyrocatéchol parfois dénommé lui aussi catéchol. L’usage dans la communauté scientifique a fini par imposer le terme de catéchine, dérivé du terme anglais catechin.
Initialement découverte dans les fruits de l'acacia à cachou (Acacia catechu) duquel elle dérive son nom, la catéchine et ses nombreux isomères sont de puissants antioxydants qui aident à prévenir les maladies inflammatoires et coronariennes.
Le terme de catéchine est aussi parfois utilisé pour désigner la classe des flavanols (flavan-3-ols, flavan-3,4-ols et leurs esters galliques). Pour éviter la confusion entre la classe et le composé, ce dernier est désigné dans ce contexte par (+/-)-catéchine.
Collagène
Cuirs et peaux
LaccasesLes laccases (EC 1.10.3.2) appartiennent à une famille d'enzymes ayant pour cofacteur du cuivre. C'est une oxydase (oxydoréductase, EC 1) que l'on retrouve dans de nombreuses plantes, champignons et micro-organismes.
Le cuivre est lié sur plusieurs sites de la protéine. On distingue trois types. Les types 2 et 3 sont appelés grappe tri-nucléaire. Le cuivre du type 1 est soluble dans l'eau. Le mercure déplace le cobalt complexé dans les laccases. Les complexants du cuivre peuvent le déplacer et le remplacer par du cobalt. Les cyanures complexent également le cuivre, mais dans ce cas il n'est pas possible de réinsérer du cobalt.
Les laccases oxydent les dérivés phénoliques mais d'une façon ménagée qui transforme la lignine en monolignol.
Phénols
Polymérisation
Poudre de peaux
Stabilité thermique
Surfaces de réponse (statistique)
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tannins used in tanning of hides and skins are limited by surface reactions as well as large molecular weights, reducing penetration into the skin and lowering the thermal stability or tanning effect. Investigation into the utilization of small phenolic compounds such as catechin to improve penetration with subsequent in situ enzymecatalysed polymerization may provide a novel and alternative tanning agent. In this study, catechin was oxidized by enzymatic catalysis using laccase, with the polymerization confirmed by FT-IR and UHPLC. Tanning experiments were undertaken to measure the effect of laccase-catalysed polymerization of catechin in the thermal stabilization of collagen, i.e., the change in shrinkage temperature between the treated and untreated sample of hide powder (ÄTs). A factorial design was subsequently used to study process parameters that may affect enzymatic reactions: temperature, substrate concentration, enzyme concentration and incubation period. The statistically significant variables were found to be temperature and incubation period, and were thus chosen to be studied further for process optimization using response surface methodology. Maximum ÄTs can be obtained for a temperature of 34.6°C and incubation period of 25 hours. This study demonstrates that the stabilization of collagen (ÄTs) is increased with the use of enzyme-assisted polymerization. Note de contenu : - MATERIALS AND METHODS : Materials - Laccase-catalyzed polymerization of catechin - FT-IR - UHPLC - Phloroglucinolysis - Factorial design and central composite design
- RESULTS AND DISCUSSION : Evaluation of laccase-catalyzed polymerized catechin using FT-IR and UHPLC - Investigation into the effect of laccase-catalyzed process for varying concentration of the substrate catechin on the stabilization of hide powder - Factorial design and central composite design to optimize process parameters of laccase-assisted stabilization of bovine hide powder using catechin as a substrateEn ligne : https://drive.google.com/file/d/1YeO476JK5Fa-c3QwVZoxREcbgc-pGevR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25426
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 2 (02/2016) . - p. 53-61[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17831 - Périodique Bibliothèque principale Documentaires Disponible Optimizing a sustainable and innovative wet-white process with tara tannins / Joan Carles Castell in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 10 (10/2011)
[article]
Titre : Optimizing a sustainable and innovative wet-white process with tara tannins Type de document : texte imprimé Auteurs : Joan Carles Castell, Auteur ; C. Fabregat, Auteur ; Silvia Sorolla, Auteur ; D. Solano, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur Année de publication : 2011 Article en page(s) : p. 278-286 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Tannage végétal
Tara et constituantsC'est un petit arbre épineux avec des gousses plates rouge qui pousse dans les zones sèches du Pérou, Amérique du Sud.
Wet-white (tannage)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This study considers the fruit of the tara tree (Caesalpinia spinosa) as a sustainable source for tanning agents and proposes alternatives to the commercial mineral salts and vegetable extracts to comply with an increasing demand that concerns low carbon footprint raw materials and health safety. Although tara tannins have been used in the leather industry and its properties being well known, the experimental part of the work aims to optimize innovative formulations using tara as wet-white pre-tanning agent. Combinations with naphthalene sulphonic and phenol condensation syntans will be used for wet white. Experiments have been designed by Simplex with centroids statistical calculations to obtain an optimized formulation. Tests are evaluated determining shrinkage temperature, tensile strength, elongation, tear resistance and light fastness. Note de contenu : - Characterization of commercial tara tanning powder
- Designof a pretanning process with tara
- Products, materials and equipmentEn ligne : https://drive.google.com/file/d/1kPDSTEmgpPC3EMkqNVGwW_07gYzVagoI/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12210
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 10 (10/2011) . - p. 278-286[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13365 - Périodique Bibliothèque principale Documentaires Disponible L'or vert, nouvel eldorado du cuir ? / Juliette Sebille in LEATHER FASHION DESIGN (LFD), N° 1 (02/2019)
PermalinkPermalinkOxazolidines - A new class of tanning agents / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 5 (09-10/1977)
PermalinkOxazolidines - A new class of tanning agents / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
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)
PermalinkPenetration of the polyflavonoids and simple phenolics : a mechanistic investigation of vegetable tanning / Teng Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 12 (12/2017)
PermalinkPerformance evaluation of hybrid formulations consisting of antioxidant and crosslinking agents for the treatment of acid degradation in historic vegetable-tanned leathers / Alireza Koochakzaei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 8 (08/2022)
PermalinkPerformance of microbicides for the preservation of vegetable tanned leather / Juliana T. Fontoura in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 7 (07/2016)
PermalinkPotential of water hyacinth leaves extract as a leather tanning agent / Fitsum Etefa Ahmed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 9 (09/2022)
PermalinkPotentilla erecta (L.) raeusch as an alternative source of environmentally friendly polyphenols for leather tanning / Virgilijus Valeika in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)
PermalinkPour des rendements élevés : mimosa / London [United Kingdom] : Wattle Export Development (nd)
PermalinkPermalinkPowdered hide model for vegetable tanning / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 1 (01/2014)
PermalinkPowdered hide model for vegetable tanning II : hydrolyzable tannin / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 1 (01/2015)
PermalinkPre-tanning process by means of pine bark powder and naphthalene sulphonate syntan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 5 (09-10/2021)
PermalinkPreparation and evaluation of tara-modified proteins / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 1 (01/2013)
PermalinkPermalinkRapid sole leather tannage using quebracho extract / Alberto R. Angelinetti in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 4 (07-08/1979)
PermalinkRapid vegetable tannage of insole leathers to modern specifications / G. E. Benskin / Zurich [Suisse] : Tanning Extract Producers Federation (n.d.)
PermalinkLa rationalisation du tannage végétal-synthétique - Remarques sur la théorie et la pratique d'un système de tannage végétal rapide / E. Komarek / Leverkusen [Allemagne] : Bayer (1965)
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