Question:
Which of the following is not used as sterilants for membranes ?
Which of the following is not used as sterilants for membranes ?
Show Hint
Acid washes (such as nitric acid or phosphoric acid) are used to dissolve mineral deposits, while sanitizers and sterilants (like chlorine, hydrogen peroxide, or metabisulfite) are used to destroy microorganisms.
Updated On: Jul 21, 2026
- Formaldehyde
- Nitric acid
- Hypochlorite solution
- Sodium metasbisulphite solution
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Membrane filtration systems (such as Ultrafiltration and Reverse Osmosis) are widely used in dairy processing.
These membranes must be sanitized and sterilized to prevent biofouling, but the chemicals used must not damage the membrane polymer.
Step 2: Detailed Explanation:
Let us evaluate the chemicals listed:
- Formaldehyde (A): Historically used as a chemical sterilant and storage preservative to prevent microbial growth on polymeric membranes during long-term shutdowns.
- Hypochlorite solution (C): A chlorine-based sanitizer used at low concentrations to sanitize chlorine-tolerant membranes.
- Sodium metabisulphite solution (D): Commonly used as a preservative and sterilant to store membranes, as it releases sulfur dioxide to prevent microbial growth.
- Nitric acid (B): This is a strong mineral acid used in the dairy industry to remove mineral scale (milkstone) during the Clean-in-Place (CIP) cycle. It is a cleaning agent, not a sterilant.
Additionally, high concentrations of strong nitric acid can degrade the polymeric structure of many membranes.
Therefore, nitric acid is not used as a membrane sterilant.
Step 3: Final Answer:
Nitric acid is not used as a sterilant for membranes.
Membrane filtration systems (such as Ultrafiltration and Reverse Osmosis) are widely used in dairy processing.
These membranes must be sanitized and sterilized to prevent biofouling, but the chemicals used must not damage the membrane polymer.
Step 2: Detailed Explanation:
Let us evaluate the chemicals listed:
- Formaldehyde (A): Historically used as a chemical sterilant and storage preservative to prevent microbial growth on polymeric membranes during long-term shutdowns.
- Hypochlorite solution (C): A chlorine-based sanitizer used at low concentrations to sanitize chlorine-tolerant membranes.
- Sodium metabisulphite solution (D): Commonly used as a preservative and sterilant to store membranes, as it releases sulfur dioxide to prevent microbial growth.
- Nitric acid (B): This is a strong mineral acid used in the dairy industry to remove mineral scale (milkstone) during the Clean-in-Place (CIP) cycle. It is a cleaning agent, not a sterilant.
Additionally, high concentrations of strong nitric acid can degrade the polymeric structure of many membranes.
Therefore, nitric acid is not used as a membrane sterilant.
Step 3: Final Answer:
Nitric acid is not used as a sterilant for membranes.
Was this answer helpful?
0
0
Top ICAR AIEEA Dairy Technology Questions
- As per legal standards (FSSR, 2011), the acidity (%LA) of chakka should not be more than:
- Which of the following food additive is permitted as preservative in paneer?
- Given below are four statements:
Statement (I) : Homogenisation breaks down fat globules in milk into smaller entities.
Statement (II) : Homogenisation breaks down fat globules and casein micelles in milk into smaller entities.
Statement (III) : Homogenisation slightly increases viscosity of milk.
Statement (IV) : Homogenisation improves the appearance of milk.
In light of the above statements, choose the most appropriate answer from the options given below. - With regard to temperature of operation, place the following unit operations in sequence in an increasing order of temperature:
(i) Sterilisation
(ii) Thermisation
(iii) Homogenisation
(iv) Bactofugation and
(v) HTST pasteurization.
Choose the correct answer from the options given below : - “Narampak” and “karapak” refer to varieties of sandesh with reference to which of the following parameters ?
View More Questions
Top ICAR AIEEA Food Safety Questions
- Which of the following is the system that relies on process controls to minimize food safety risks in the dairy processing industry?
- Which of the following is a correct abbreviation for SCADA?
- Which of the following is a correct abbreviation for OPRP?
- Which of the following packaging forms is referred to as "3D packaging and food service article that is manufactured from an aqueous slurry of cellulosic fibres and formed into discrete products on screened moulds"?
- Which of the following packaging material with a thickness of about 0.2 millimeter is best suited for blister packaging?
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions