Question

Modified borntrager’s test is used to detect the presence of which type of glycosides:

• A. O-type of glycosides
• B. C-type of glycosides
• C. S-type of glycosides
• D. N-type of glycosides

Answer 1

The Correct Option is C

The Modified Borntrager’s test is a specific chemical test used to detect the presence of certain types of glycosides, primarily S-type of glycosides, which are also known as anthraquinone derivatives.

Let's delve deeper into why the Modified Borntrager’s test is used to detect S-type glycosides:

1. Concept of Glycosides: Glycosides are molecules in which a sugar is bound to a non-carbohydrate moiety, usually via a glycosidic bond. They are classified based on the nature of this non-sugar component. S-type glycosides specifically contain sulfur linkages.
2. Understanding the Test: The Modified Borntrager test involves the extraction of glycosides with organic solvents followed by an alkaline solution, which enhances the detection of anthraquinone derivatives.
3. Procedure of the Test:
   • A sample is treated with an organic solvent to extract the glycosides.
   • The extract is then treated with a strong alkaline solution, such as ammonia.
   • If anthraquinones (typically linked in S-type glycosides) are present, a red or pink color will develop in the alkaline phase, indicating a positive test.
4. Conclusion: This distinctive development of color due to the reaction of S-type glycosides with an alkaline solution forms the basis of the Modified Borntrager’s test. This specificity in detecting S-type glycosides distinguishes it from other types of glycoside tests.

Thus, the correct answer is S-type of glycosides.