Question

Rose-Gotteleib method is used for extraction of

• A. Milk Fat
• B. Milk Sugar
• C. Milk Protein
• D. Vitamin

Hint:

Associate the major analytical methods with the components they measure: {Rose-Gottlieb / Gerber / Mojonnier} \(\rightarrow\) {Fat}; {Kjeldahl} \(\rightarrow\) {Protein}. These are fundamental pairings in dairy chemistry.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The question asks to identify the milk component that is measured using the Rose-Gottlieb method. This is a standard reference method in analytical chemistry for food analysis.
Step 2: Detailed Explanation:
The Rose-Gottlieb method is a classic, highly accurate laboratory procedure for determining the fat content of milk and milk products. It is a gravimetric method, meaning it determines the amount of a substance by weighing.
The procedure involves dissolving the sample in ammonia and ethanol, followed by extraction of the fat using a mixture of two solvents, diethyl ether and petroleum ether. The solvents are then evaporated, and the remaining residue, which is the extracted fat, is weighed.
It is different from methods used for other components:
Milk Protein is determined by the Kjeldahl method.
Milk Sugar (Lactose) can be determined by polarimetry or colorimetric methods.
Vitamins are measured using methods like HPLC.
Step 3: Final Answer:
The Rose-Gottlieb method is a reference method used for the extraction and quantification of milk fat.