Question

If in melted butter sample, concentrated HCl is added in equal amount along with sugar. Development of crimson colour indicates presence of

• A. Coal Tar Dyes in butter
• B. Vanaspati in butter
• C. Starch in butter
• D. Synthetic Annatto Colour in butter

Hint:

Concentrated \(\text{HCl}\) + Sugar + Ghee/Butter \(\rightarrow\) Crimson Color = Baudouin Test (detects Sesame Oil Vanaspati).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The Baudouin test is a colorimetric chemical reaction used to detect the presence of sesame oil, which is legally mandated to be added to Vanaspati (hydrogenated vegetable oil) in India as an integrated tracer.

Step 2: Detailed Explanation:
- In India, the law requires all manufacturers of Vanaspati to add a minimum of \(5\%\) sesame oil to facilitate easy detection of adulteration in pure dairy products like ghee and butter.
- Sesame oil contains a natural unsaponifiable compound called sesamolin.
- When concentrated hydrochloric acid (\(\text{HCl}\)) and sucrose (sugar) are added to the sample, the acid hydrolyzes sucrose into glucose and fructose, which further dehydrates to form furfural.
- Furfural reacts specifically with sesamolin from sesame oil to form a distinct crimson-red complex.
- If butter is adulterated with Vanaspati, this reaction produces a crimson color, confirming the presence of the adulterant.

Step 3: Final Answer
The development of a crimson color under these test conditions indicates the presence of Vanaspati in the butter.