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II- Drugs Containing Cardiac Glycosides - page 16 / 25

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Active constituents:

1- Free anthraquinone: rhein, chrysophanol, emodin, aloe-emodin

2- Anthraquinone glycoside.

3- Astringent compounds: catechin, epicatechin, free gallic acid, glucogallin.

Uses:

In small dose: bitter stomachic and intestinal astringent.

In large dose: purgative followed by astringent effect.

Chemical tests:

Borntrager's test: rose-red colour.

Microsublimation: yellow needle crystals which gives red colour with KOH.

Test for purity:

When the powder is examined in ultra-violet radiation, no shining violet spots are seen ( to assure the absence of  Rhapontic Rhubarb).

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