Tanning capacity of Tessmannia burttii extracts : the potential eco-friendly tanning agents for the leather industry / Cecilia R. China in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 9 p. Titre : Tanning capacity of Tessmannia burttii extracts : the potential eco-friendly tanning agents for the leather industry Type de document : texte imprimé Auteurs : Cecilia R. China, Auteur ; Stephen S. Nyandoro, Auteur ; Joan J. E. Munissi, Auteur ; Mihayo M. Maguta, Auteur ; Michael Meyer, Auteur ; Michaela Schroepfer, Auteur Année de publication : 2021 Article en page(s) : 9 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement Extraction (chimie) Extraits de plantes Flavonoïdes Phénols Tanins végétaux Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the present study, the tannins from stem and root barks of Tessmannia burttii Harms (Caesalpiniaceae), a plant species abundantly growing in Tanzania and other parts of Africa, were investigated for their suitability in hides tanning. Tannin powder was extracted at selected temperatures (30, 50 and 80 °C) and the influence of each temperature on the crosslinking capacity was evaluated. The interaction mechanism between hide powder collagen and the tannins was studied by Differential Scanning Calorimetry (DSC), trinitrobenzensulfonic (TNBS) acid assay and amino acid hydrolysis methods. Extraction temperatures showed low influence on crosslinking capacity of the tannins. However, extract obtained at 50 °C exhibited best performance in terms of gap size between Tonset and Tpeak. The stem bark extract yield was higher than that from the root bark, but both were within the recommended ranges. The tannin content (61%) of T. burttii stem bark extract was above recommended value (10%), whereas its total phenolic content and total flavonoic content were found to be above that of commercial Acacia mearnsii tannin. The study of cross-linking parameters as a function of pH showed cross-linking to occur via a covalent mechanism at the basic amino groups. However, the bonds were not resistant to acid hydrolysis. The observed interaction mechanism indicated that tannins from stem and root barks of T. burttii belong to the condensed tannin, similar to A. mearnsii (black wattle), a commercial tannin source that was used in this study as a reference. Findings from this study depict that T. burttii extracts are auspicious eco-friendly alternative source of vegetable tannins to overcome the use of chromium salts in the leather industry. Note de contenu : - Effect of extraction temperature on crosslinking capacity - The extract yield, tannin content, total phenolic and flavonoid contents of the Tessmannia burttii extracts - The interaction mechanism between vegetable tannins from Tessmannia burttii and collagen of the hide - Table 1 : The interval between Tonset and Tpeak of hide powder cross-linked with extract of Tessmannia burttii and Acacia mearnsii at pH 5 in dependence of Temperature of extraction - Table 2 : Tannin content, total phenolic content and total flavonoid content of the T. burttii extracts extracted at 50 °C DOI : https://doi.org/10.1186/s42825-021-00055-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00055-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37539 [article]

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