Question

During freezing of fish, the maximum ice crystal formation zone lies between

• A. -5 °C to -1°C
• B. -1 °C to -5°C
• C. -55 °C to -60°C
• D. -6 °C to -10°C

Hint:

Fish Freezing Kinetics: Zone of Maximum Ice Crystal Formation = $-1^\circ\text{C to } -5^\circ\text{C}$. Quick freezing passes this zone rapidly to minimize cell damage and thaw drip.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Refrigeration physics and crystallization kinetics in fish freezing: the critical zone of maximum ice crystal formation occurs between $-1^\circ ext{C}$ and $-5^\circ ext{C}$ where over 80% of free cellular water crystallizes.
Key Formula or Approach:
\[ \text{Critical Freezing Plateau: } -1^\circ\text{C to } -5^\circ\text{C} \quad [\text{Fast Freezing traverses this zone in } < 2\text{ hours to avoid drip loss}] \]

Step 2: Detailed Explanation:
In fish preservation, refrigeration, and freezing technology:
- Water in fish muscle contains dissolved solutes, depressing the initial freezing point to approximately $-1.0^\circ ext{C}$ to $-1.5^\circ ext{C}$.
- As temperature drops from $-1^\circ ext{C$ to $-5^\circ ext{C}$ (Zone of Maximum Ice Crystal Formation Thermal Arrest Plateau)}, more than $80\% - 85\%$ of the total muscle water is converted into solid ice crystals.
- Quick Freezing is engineered to rapidly traverse this critical zone in under 2 hours, forming millions of tiny microscopic intracellular ice crystals that leave muscle cell membranes intact and prevent thawing drip loss.

Step 3: Final Answer:
Thus, the maximum ice crystal formation zone lies between -1 °C to -5°C, corresponding to option (B).