Extraction of a novel tanning agent from indigenous plant bark and its application in leather processing / Raju Kumar Das in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 15 p. Titre : Extraction of a novel tanning agent from indigenous plant bark and its application in leather processing Type de document : texte imprimé Auteurs : Raju Kumar Das, Auteur ; Al-Mizan, Auteur ; Fatema Tuj Zohra, Auteur ; Sobur Ahmed, Auteur ; Khondoker Shahin Ahmed, Auteur ; Hemayet Hossain, Auteur Année de publication : 2022 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Cuirs et peaux de chèvres Extraction par solvant Retannage Tanins -- analyse Tanins végétaux Tannage chrome free Tannage végétal Température de retrait Xylocarpus granatum Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The use of vegetable tanning materials in leather processing has drawn attention as an alternative to basic chromium sulphate for its natural abundance and environmental aspects. In this work, an attempt has been made to extract vegetable tannins from Xylocarpus granatum bark using different solvents (e.g., water, methanol, ethanol, and chloroform) and compare with conventional vegetable tanning agents such as mimosa and quebracho. The highest extraction efficiency was observed 31.22% by methanol. The presence of tannin content and polyphenolic compounds, e.g. (-)epicatechin (503 mg/100 g dry extract), catechin hydrate (218 mg/100 g dry extract), catechol (29 mg/100 g dry extract) were ensured by UV–Vis, FT-IR spectroscopy and HPLC. Again, condensed tannins, moisture content, and pH of the methanol extracted tannin were found 47.80%, 5.82%, and 3.97 respectively. The leather tanned by Xylocarpus granatum tannin showed a shrinkage temperature of 86.34 ± 1.52 °C. Other properties such as tensile strength, tear strength, grain cracking load, and distention at grain cracking were comparable to conventional vegetable-tanned leather. The cross-sectional morphology of the tanned leathers was also characterized by scanning electron microscopy (SEM) which revealed a compact structure of the leather fibers. In light of the findings from the study, X. granatum bark tannin could be a well alternative to chromium and a new source of vegetable tannin for the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Determination of the properties of X. granatum tanned leather - RESULTS AND DISCUSSION : Extraction efficiency of X. granatum tannin by different solvents - Composition of extracted tanning material - Qualitative identification of X. granatum tannin - Chemical structure of X. granatum tannin - Tanning performances of X. granatum tannin - Table 1 : Tanning, and retanning process of goat skin - Table 2 : pH, moisture content of the extracted sample, and standard tanning materials (Mean ± SD) - Table 3 : Chemical tests for the presence of tannin in Xylocarpus granatum extracted sample - Table 4 : Total tannin content and condensed tannin of Mimosa, Quebracho and Xylocarpus granatum - Table 5 : Physical–mechanical properties of leather tanned by conventional and extracted tannin (mean ± SD) DOI : https://doi.org/10.1186/s42825-022-00092-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00092-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38214 [article]

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