Question

Which diagnostic identification test is used for anthraquinone glycosides present in senna?

• A. Keller--Killiani test
• B. Borntrager's test
• C. Shinoda test
• D. Foam test

Hint:

Borntrager's test is used for anthraquinone glycosides; Keller--Killiani test is used for cardiac glycosides.

Answer 1

The Correct Option is B

Concept:
Senna contains anthraquinone glycosides, which are responsible for its laxative action.

Step 1: Understanding anthraquinone glycosides.
Anthraquinone glycosides are plant constituents commonly found in laxative crude drugs such as senna, aloe, and cascara.

Step 2: Test for anthraquinone glycosides.
Borntrager's test is used for detecting anthraquinone glycosides.

Step 3: Principle of Borntrager's test.
Anthraquinones are extracted and treated with alkali. A pink to red colour in the alkaline layer indicates presence of anthraquinone glycosides.

Step 4: Checking other tests.
Keller--Killiani test is used for cardiac glycosides.
Shinoda test is used for flavonoids.
Foam test is used for saponins.
Borntrager's test is used for anthraquinone glycosides.

Step 5: Final answer.
Therefore, the diagnostic test is Borntrager's test. \[ \boxed{\text{Borntrager's test}} \]