Page 155 - Pharmacognosy-II (06-PG 303)

Extracts
4.Catechu ‫كاد أسود‬

Origin and preparation: It is the extract prepared from the heartwood of
Acacia catechu family fabaceae.
The extract is prepared by boiling heartwood pieces in water, evaporating this
mixture to syrup, and then cooling to molds. The dried molds are then broken
into dark powder pieces.
It has a black colour, no odour, astringent sweetish taste.

Constituents:
Catechin, phlobaphenes and quercetin (flavonoid).

Test for identity:
A magenta red color with match-stick test and green colour wit ferric

chloride solution.

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