Page 291 - Pharmacognosy 2 PG303

Level 2 Clinical Pharmacy-Pharm D

■ Test for

Anthraquinones
(Bornträger's test):

pink color in the

ammoniacal layer

(aqueous layer)
■ Others???

❖ Rheum raponticum

contains rhaponticin

which is a stilbene

derivative that has
estrogenic effect.
➢ It can be detected in
the official drug by:
✓ It gives blue

fluorescence in UV

radiation unlike

rhubarb gives reddish
brown fluorescence.
✓ Furfural test:
furfural + dps. of
conc .H₂SO₄ + little

powder if rhapontic

gives
violet color.

■ Depending on the ▪ It resembles digitalis Rat poison
dose ,rhubarb can be (Rodenticide)
used as: in its action on the
heart .It increases the
- Laxative )1-2 g)
strength and reduces
- Astringent and
stomachic )0.1-0.2g) the frequency of the
cardiac action.
▪
It is a powerful
expectorant &

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