EXTRACTION & IDENTIFICATION OF SOME BARK TANNINS OF PINUS BRUTIA TEN.AND QUERCUS AEGILOPS L.GROWING IN IRAQ | ||
| AL-TAQANI | ||
| Article 1, Volume 25, Issue 4, December 2012, Pages 0-0 | ||
| Abstract | ||
| Tannins are considered one of the most important plant extracts from wood & bark of forest trees, such materials are very important in many of the chemical industries, leather processing, drug production, medical materials and adhesives. In this study tannin extracted from the bark of some forest tree growing in Iraq,namely Pinus brutia and Quercus aegilops. The study included two stages: the first is to obtain alcoholic and aqueous extracts using soxhlet, and the second, is to identify tannin compounds existing in those extracts using thin layer chromatography technique. The laboratory extractions of both types of trees above indicated that there is existence of appropriate amounts of tannin extracts reached (15.3% 12.65%) in pine and oak respectively. The tannin rate in aqueous extracts were higher than that of alcoholic extracts for both types of bark, also the rate of tannin in Pinus brutia extract was higher than its rate in Quercus aegilops extract. The nature of these tannins and their compounds, have been separated and identified by using chromatographic technique. Tannin compounds that included in Pinus brutia extract were:{{-)gallocatechin, (-)catechin, (-)epicatechin and (+)afzelechin}and in Quercus aegilops were: {(-)catechin, (-)epicatechin, (+)afzelechin, (-)epiafzelechin, gallic acid, phloroglucinol, (-) gallocatechin and ellagic acid}. From these results it can be concluded that Pinus brutia tannins consist mainly of condensed and some hydrolysable tannins, while Quercus aegilops tannins consist mainly hydrolysable and some condensed tannins as complex mixture. | ||
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