Page 138 - Pharmacognosy-I (02-06-06-102)

Frangula Powder :

It is yellowish-brown in colour characterized by :
1- Fragments of purplish cork cells.
2- Fragments of groups of lignified phloem fibres, accompanied by

crystal sheath containing calcium oxalate prisms.
3- Absence of sclereids.
4- Numerous cluster-crystals of calcium oxalate.

Powdered Frangula bark

Constituents :

- Anthraquinone glycoside glucofrangulin which by hydrolysis give
frangulin.
-The bark also contains free frangula-emodin
.

Test for identity :
Modified Borntrager's test: see Cascara Bark

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