| 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 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 5 (09-10/2015) . - p. 245-249
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Determination of antioxidant properties of commonly used vegetable tannins and their effects on prevention of Cr(VI) formation in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)
