Question

Karl Fisher Reagent Titration Method is used for determination of __________.

• A. Moisture
• B. Sugars
• C. Protein
• D. Vit. E

Hint:

Remember: For trace water analysis, liquid fats/oils, and highly sugar-rich foods, Karl Fischer titration is the gold-standard chemical method for measuring absolute Moisture.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Quantifying the water content (moisture) in food materials is essential for determining shelf life, storage stability, texture, and regulatory compliance.
While oven-drying methods are common, certain foods (like dried fruits, sugars, oils, and chocolates) require highly specific chemical methods to avoid thermal degradation.

Step 2: Detailed Explanation:
The Karl Fischer titration method is a highly precise and specific chemical method used exclusively for the determination of Moisture (water content).
The chemical reaction is based on the oxidation of sulfur dioxide by iodine in the presence of water:
\[ \text{I}_2 + \text{SO}_2 + 3\text{C}_5\text{H}_5\text{N} + \text{CH}_3\text{OH} + \text{H}_2\text{O} \longrightarrow 2\text{C}_5\text{H}_5\text{N}\cdot\text{HI} + \text{C}_5\text{H}_5\text{N}\cdot\text{HSO}_4\text{CH}_3 \] Since one mole of iodine (\(\text{I}_2\)) reacts quantitatively with exactly one mole of water (\(\text{H}_2\text{O}\)), measuring the volume of Karl Fischer reagent consumed allows for the precise calculation of the water content down to trace ppm levels.
This method is highly superior to oven-drying because it measures only water, preventing errors caused by the loss of other volatile compounds or thermal decomposition of sugars.

Step 3: Final Answer:
Therefore, Karl Fischer Reagent Titration Method is used for the determination of Moisture.