Question:
The most suitable test for digitoxose is:
The most suitable test for digitoxose is:
Updated On: Jul 14, 2026
- Hager's test
- Dragendrof's test
- Baljet test
- Keller–Kiliani
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The Correct Option is D
Approach Solution - 1
The correct option is (D): Keller–Kiliani.
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Approach Solution -2
Digitoxose is the 2,6-dideoxysugar found attached to cardiac glycosides such as digitoxin. The question asks which test is best suited to detect this particular sugar. Let's go through each option.
- Hager's test: Hager's test uses a saturated picric acid solution and is used to detect anthraquinone glycosides, which turn the reagent orange-red. It has nothing to do with detecting a deoxysugar.
- Dragendorff's test: This test uses potassium bismuth iodide solution and gives an orange or red precipitate with alkaloids. Digitoxose is a sugar, not an alkaloid, so this test does not apply.
- Baljet test: Baljet's test uses sodium picrate in alkaline solution and detects the alpha, beta-unsaturated five-membered lactone ring (the butenolide ring) found in cardenolides, giving an orange to red colour. It tests the steroid-lactone part of the molecule, not the sugar portion.
- Keller-Kiliani test: This test uses glacial acetic acid with a trace of ferric chloride, layered carefully over concentrated sulfuric acid. It is specific for 2-deoxysugars, the class digitoxose belongs to. A blue colour develops in the acetic acid layer within a few minutes, which is the classic positive result for this sugar.
Since digitoxose is a 2-deoxysugar, the test built specifically around that sugar class, the Keller-Kiliani test, is the one that correctly identifies it.
So the correct answer is Keller-Kiliani.
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