Tannin Containing Drug (Part 02) = Black Catechu (Source, Preparation Method, Chemicals and Uses)

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BLACK CATECHU
Biological Source
Cutch or black catechu is an dried aqueous extract prepared from the heartwood of Acacia catechu (Leguminosae).

Description
Cutch occurs in black, somewhat porous masses. The taste resembles that of gambir. Microscopical examination of the water-soluble residue shows wood fibres and large vessels and sometimes fragments derived from the leaves on which the drug is spread.

Chemical constituent
Cutch contains 2–12% of catechins, 25–33% of phlobatannin, 20–30% of gummy matter, quercitrin, quercitin, moisture, etc. It yields 2–3% of ash. The catechin (acacatechin) is not identical with that in gambir.The catechin (acacatechin) is not identical with that in gambir. The drug may be distinguished from gambir as it gives no reaction for gambir-fluorescin. Catechin forms white, acicular crystals which are soluble in hot water and alcohol and give a green colour with ferric salts. Catechutannic acid is an amorphous phlobatannin which appears to be formed from catechin by loss of the elements of water. It readily yields the phlobaphene catechu-red

Uses
Catechu is used in medicine as an astringent and also for the treatment of cough and diarrhea. It is used also for Cooling and digestive purpose. Externally for boils, skin eruption, and ulcer

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