Question:

Membrane filtration refers to:
(A) Separation of soils from liquids
(B) A separator is used which could be porous medium or membrane
(C) Helps in clarification of juices and separation of microbes
(D) Not commonly used in fruit juices, wine and beer
Choose the correct answer from the options given below:

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Membrane filtration acts as a "cold pasteurization" method.
It removes bacteria and yeasts from beverages without using heat, keeping the volatile flavor profiles intact.
  • (A), (B) and (C) only.
  • (A), (B) and (D) only.
  • (A), (B), (C) and (D).
  • (B), (C) and (D) only.
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The Correct Option is A

Solution and Explanation

Step 1: Understanding the Concept:
Membrane filtration is a physical separation technique that uses a semi-permeable barrier to separate components based on size.
It is widely applied in the food and beverage industry to purify, clarify, or concentrate liquids.

Step 2: Detailed Explanation:

Statement (A): In processing terminology, "soils" refers to suspended solid impurities, residues, or sediments.
Membrane filtration effectively separates these micro-solids from the liquid stream. Thus, (A) is correct.
Statement (B): The separation process uses a specialized porous medium or synthetic membrane.
The pore size of the membrane determines which particles are retained and which pass through as permeate. Thus, (B) is correct.
Statement (C): In the food industry, microfiltration and ultrafiltration membranes are widely used to clarify fruit juices and remove spoilage microbes (yeasts, bacteria, and molds) without applying heat. Thus, (C) is correct.
Statement (D): The statement claims membrane filtration is "not commonly used" in fruit juices, wine, and beer.
This is incorrect. Membrane filtration is an industry standard for the cold sterilization of beer, clarification of apple juice, and cold stabilization of wine to preserve fresh flavors. Thus, (D) is false.
Therefore, only statements (A), (B), and (C) are correct.

Step 3: Final Answer:

The correct option is (A), as statements (A), (B), and (C) are accurate, while (D) is false.
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