Question:
The most suitable test for digitoxose is:
The most suitable test for digitoxose is:
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The Keller–Kiliani test is a well-known color reaction test used specifically for detecting digitoxose and other sugars in cardiac glycosides.
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 Keller–Kiliani test is the most suitable test for detecting digitoxose. This test is used for detecting digitoxose, a sugar component in cardiac glycosides, and is characterized by the formation of a red or brown color when digitoxose is present.
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Approach Solution -2
The question asks which chemical test is most suitable for detecting digitoxose, the deoxy sugar found attached to cardiac glycosides. Let's check what each named test is actually designed to detect.
- Hager's test: Hager's test is used to detect anthraquinone-type compounds, where the sample is treated with alkali and a positive result gives a pink to red colour. It has no connection to detecting deoxy sugars like digitoxose.
- Dragendorf's test: Dragendorff's reagent (potassium bismuth iodide) is a general precipitation test for alkaloids, giving an orange or reddish-brown precipitate. Digitoxose is a sugar, not an alkaloid, so this test does not apply here.
- Baljet test: Baljet's test uses sodium picrate to detect the unsaturated lactone ring characteristic of cardiac glycosides, producing an orange to red colour. It targets the lactone portion of the molecule, not the sugar portion, so it does not specifically confirm digitoxose.
- Keller-Kiliani: This test uses glacial acetic acid containing a trace of ferric chloride, layered carefully over concentrated sulfuric acid. It is specific for 2-deoxy sugars, the sugar class that digitoxose belongs to, and gives a characteristic blue colour that develops at the interface between the two acid layers, confirming the presence of this deoxy sugar.
Since digitoxose is a 2-deoxy sugar, the test built specifically to detect that sugar class, rather than the steroid nucleus or lactone ring of the glycoside, is the appropriate choice.
Therefore, the correct answer is Keller-Kiliani.
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