Suitability of selected vegetable tannins traditionally used in leather making in Tanzania

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dc.contributor.author China, Cecilia R.
dc.contributor.author Hilonga, Askwar
dc.contributor.author Nyandoro, Stephen S.
dc.contributor.author Schroepfer, Michaela
dc.contributor.author Kanth, Swarna V.
dc.contributor.author Meyer, Michael
dc.contributor.author Njau, Karoli N.
dc.date.accessioned 2020-06-10T09:34:13Z
dc.date.available 2020-06-10T09:34:13Z
dc.date.issued 2020-04-01
dc.identifier.uri https://doi.org/10.1016/j.jclepro.2019.119687
dc.identifier.uri https://dspace.nm-aist.ac.tz/handle/20.500.12479/777
dc.description This research article published by Elsevier Ltd., 2020 en_US
dc.description.abstract The use of chromium salt has dominated in tanning industry worldwide due to its high versatility in quality leather production. However, Environmental concerns of chromium have shifted the interest of current research to chrome-free and greener chemical processing options. Vegetable tannins, especially when used in combination with some benign metals, have been proven to be environmentally safe and manageable, while producing good quality leather with similar shrinkage temperature as that of chromium tanned. As such, shortage of vegetable tannin supply necessitates characterization of non-commercialized sources locally available to feed cottage tanneries. In the present work, extracts from Acacia mearnsii, Acacia xanthophloea, Euclea divinorum and Euclea racemosa, leached by simple technique at 30–80 °C temperature range were characterized for extract yield, tannin, total flavonoid and phenolic contents, crosslinking ability as well as properties of tanned leather. Results indicate that at 50 °C extraction temperature, A. xanthophloea bark gave extract with properties similar to that of A. mearnsii (commercialized source of tannin). Extract from E. divinorum bark contain fairly less extract yield, tannin, total flavonoid and phenolic contents than that of A. mearnsii, but had good crosslinking ability and tanning performance similar to that of A. mearnsii when used in combination with Aluminium Sulphate [Al2(SO4)3]. The 2% Aluminium Oxide (Al2O3) equivalent was established to be optimal dose of Al2(SO4)3 for extract pre-treatment. E. racemosa barks have high extract yield, but very low crosslinking ability, making it not suitable as a tannin source. This work provides useful information on the potential source of tannins for cottage leather industries in Tanzanian and beyond. en_US
dc.language.iso en en_US
dc.publisher Elsevier Ltd. en_US
dc.subject Leather industry en_US
dc.subject Cottage tanneries en_US
dc.subject Combination tanning en_US
dc.subject Plant extract en_US
dc.subject Hydrothermal stability en_US
dc.title Suitability of selected vegetable tannins traditionally used in leather making in Tanzania en_US
dc.type Article en_US

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