Determination of antioxidant properties of commonly used vegetable tannins and their effects on prevention of Cr(VI) formation / Cigdem Kilicarislan Ozkan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 5 (09-10/2015) . - p. 245-249 Titre : Determination of antioxidant properties of commonly used vegetable tannins and their effects on prevention of Cr(VI) formation Type de document : texte imprimé Auteurs : Cigdem Kilicarislan Ozkan, Auteur ; Hasan Ozgunay, Auteur ; Deniz Kalender, Auteur Année de publication : 2015 Article en page(s) : p. 245-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Chrome hexavalent Cuirs et peaux -- Analyse Essais accélérés (technologie) Gallo-tanins Phénols Tanins végétaux Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Even though Cr(VI) is not used in any step of leather making, the presence of Cr(VI) in leather has become a concern in the leather industry. Free radicals usually play an important role in the formation of Cr(VI) in leather. The effectiveness if antioxidant materials in preventing free radical formationis well know. Tannins as phenolic materials are also know to have antioxidant properties. However, the antioxidant effectiveness shows variations regarding to the type and structure of tannins. In the present study, the vegetable tannins which are commonly used in the leather industry (mimosa, quebracho, sumac, tara, valonea and chesnut) were selected and their antioxidant powers were determined by FRAP (The Ferric Reducing Ability of Plasma) and TEAC/ABTS (Trolox-Equivalent Antioxidant Capacity/2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)) methods. Furthermore, these vegetable tannins were used in leather processing and their effect on prevention of Cr(VI) formation was examinated. The results show that gallotannins within the hydrolysable tannins have taken the first places in ranking with superior antioxidant activities and, compatible with their antioxidant powers they were found to be the most effective tannin types at preventing Cr(VI) formation. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Methods - Determination of total phenols - Determination of antioxidant powers of vegetable materials - Usage of vegetable materials in leather production - Artificial ageing of leather samples and Cr(VI) analysis - RESULTS AND DISCUSSION : Total phenolic contents and antioxidant powers of plant extracts - Cr(VI) contents of leather samples En ligne : https://drive.google.com/file/d/1WP5LL0UQzKzcsUhjHNEQVtZlf7a-84TZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24655 [article]

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A novel way to avoid Cr(VI) formation in leather : copper mordanting / Cigdem Kilicarislan Ozkan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 2 (03-04/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 2 (03-04/2017) . - p. 94-96 Titre : A novel way to avoid Cr(VI) formation in leather : copper mordanting Type de document : texte imprimé Auteurs : Cigdem Kilicarislan Ozkan, Auteur ; Hasan Ozgunay, Auteur ; Deniz Kalender, Auteur Année de publication : 2017 Article en page(s) : p. 94-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Analyse Cuivre Essais accélérés (technologie) Mordançage (teinture) Tanins végétaux Tannage combiné Le 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-Synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In recent decades many studies have been conducted in order to understand the exact origin of Cr(VI) in leather and find, remedies for this problem and it seems that most tanners have resolved this issue in industry. However, in the present study a novel way to avoid Cr(VI) formation in leather by copper mordanting (CuSO4.5H2O) was investigated. 0.5 and 1.0% (w/w) of CuS04.5H2O were used bath standalone and also in combination with vegetable tannins which are commonly used in leather industry. From the results it was seen that bath, in standalone, and in combination usage with vegetable tannins, copper seems to be a solution against formation of Cr(VI) in leather and keeping the Cr(VI) values below the permissible limits. Note de contenu : - Materials - Methods - Artificial ageing of leather samples and Cr(VI) analysis En ligne : https://drive.google.com/file/d/1g6Vum98uhDlqVW6QqqtV2EcjtW17mqZL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28516 [article]

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