Question

Which of the following processing methods is commonly used to produce instant cereal products?

• A. Fermentation
• B. Extrusion
• C. Distillation
• D. Freeze-drying

Hint:

Extrusion is the primary industrial technology for manufacturing ready-to-eat (RTE) breakfast cereals, savory scks, and textured vegetable proteins (TVP).
It combines mixing, cooking, shearing, and forming in a single continuous unit operation.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Instant cereal products require rapid reconstitution or readiness for direct consumption.
The manufacturing process must gelatinize starches and modify protein structures to make them easily digestible and soluble.

Step 2: Detailed Explation:
Extrusion cooking is a high-temperature short-time (HTST) process.
In this method, cereal flour is subjected to high shear, temperature, and pressure inside a barrel.
This combition of physical forces leads to starch gelatinization, protein deturation, and plasticization of the food mass.
As the material exits the extruder die, a sudden drop in pressure causes the entrapped moisture to flash off as steam.
This results in expansion and a highly porous, light, and crisp structure.
This processed structure allows instant cereals to absorb milk or water rapidly.
Other methods like fermentation, distillation, and freeze-drying do not achieve the high-throughput thermoplastic starch gelatinization required for ready-to-eat cereals.

Step 3: Fil Answer:
The correct option is (B).