POTENTIAL TANNING AGENTS FROM INDIGENOUS FLORA
| Autor: | BUCIŞCANU Ingrid-Ioana, PRUNEANU Melinda, CREŢESCU Igor, BĂLĂU-MÎNDRU Tudorel |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Annals of the University of Oradea: Fascicle of Textiles, Leatherwork, Vol XX, Iss 1, Pp 131-136 (2019) |
| Druh dokumentu: | article |
| ISSN: | 1843-813X 2457-4880 |
| Popis: | At present, about 90% of global leather is tanned with basic chromium salts, but public and authorities concern on the chromium toxicity forces tanneries to produce chrome-less or chrome-free leather. Lately, the old craft of vegetable tanning, which claims to be the most environmentally-friendly, has enjoyed a noticeable revival. At the same time, there is increasing interest in finding new vegetable sources for tannins from the European flora, as susatinable and cheaper alternatives to the expensive exotic species such as mimosa, quebracho or myrobalan. Along time, tanners have used barks and woods of different plants, but their properties are seldom documented. In this paper, some qualitative and quantitative tests on water extracts of Alnus glutinosa, (the black alder, Betulaceae family) and Prunus spinosa ((blackthorn, Rosaceae family) were performed, in order to evaluate their tannin contents and potential tanning ability. Extraction was performed at a plant material:water mass ratio of 1:10, at 60°C, with extraction yield of 22.5% for adler extract (AE) and 8.9 % for blackthorn extract (BE). Spot tests were performed with positive responses. The total polyphenol contents (TPC) was determined by the Folin-Ciocalteu method, and expressed in terms of gallic acid equivalents(GAE). The TPC was 502.1 mg GAE/g AE and 249.72 mg GAE /g BE. The tannin content was estimated by a modified hide powder method, and was 155.43 mg GAE/g AE and 199.91 mg GAE/g BE. Given the working conditions, the extraction yield and tannin content of both species can be considered as satisfactory. Further leather tanning experiments are required to confirm their possible use as tanning agents. |
| Databáze: | Directory of Open Access Journals |
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