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Submitted: 16 May 2007
HERDIN Record #: PCHRDPC900835

A chemical study of the bark of "tangal" [Ceriops tagal (Perr.) C.B. Rob.] with particular emphasis on the separation of the coloring matter.

 Dayco J

Previous references on the utilization of "tangal" and the properties of the extract obtained from the bark were reviewed. Preliminary analysis of the bark indicated the presence of catechol tannin and coloring matter. The powdered bark of "tangal" contains 27.35% of catechol tannins which make the coloring matter a valuable source of tanning materials. Dilute alcohol was considered the best solvent of the extraction of the coloring matter and tannin from the colored bark yielding an extract as high as 42.11%. Alcohol followed which yields 36.83% of extract. Water ranks third giving an extract of 30.3% and lastly petroleum benzene giving an extract of 0.6732%. The isolated coloring materials is of reddish-brown color, whose solution produces beautiful wine red color with ammonium hydroxide, an orange-yellow color with dilute hydrochloric or sulfuric acid, and a pinkish-violet precipitate with lead acetate or sub-acetate solution.(Author)

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