Page 60 - final Practical handout PG 303-Cogno-2- 2024-2025

Clinical Pharm D Level 2 Pharmacognosy-2 (PG 303)

Myrrh ‫مر البطارخ‬

Chemical tests:

1- With the vapor of bromine a violet color is given by the genuine myrrh.

2- On addition of few drops of nitric acid a purplish violet color is produced.

3- Test for Gum fraction: oxidase enzyme test.

Asafoetida ‫الحلتيت‬

* Odour: strong alliaceous. * Taste: bitter, acrid and alliaceous.

Chemical tests:

1- Place a drop of sulphuric acid on the freshly fractured surface of a tear of asafoetida, a
bright red or reddish-brown color is produced changing to violet on washing with water.

2- The freshly fractured surface assumes a green color when touched with nitric acid
(diluted with equal volume of water).

Questions:

1- Both Myrrh and Asafoetida are characterized by containing .............................................
giving ............................................. color with benzidine.
2- Gum acacia has ……………………… shape while gum tragacanth has
……………………. shape.
3- Dried extracts examples are ………………………… and ……………………..
4- Dried juices can be stored in cells as ……………. or cavities as………………...
5- Gums are generally divided into ……………………….and ……………………….
differentiated by optical activity

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