Introduction to Food Processing and Food Science
Scope of the domain
This domain tests whether you can separate food science (composition, reactions, microbiology, nutrition and sensory behaviour of food) from food processing (the unit operations that turn raw agricultural material into safe, stable, convenient products). It also tests the food chain and processing levels.
Core rules and concepts
- Food science explains why a process works; food technology applies and controls it at industrial scale.
- Primary processing: cleaning, sorting, grading, milling, extraction, slaughtering and chilling. It makes raw material stable and transportable.
- Secondary processing: baking, canning, freezing, fermentation and extrusion. It converts primary material into consumer products.
- Tertiary processing: further convenience and service systems such as ready meals, retail packing and catering.
- A unit operation is one physical step: washing, size reduction, heat exchange, drying, mixing or separation. A process is a sequence of unit operations.
- Processing objectives include safety, shelf-life, convenience, nutrient retention, waste reduction and employment.
Worked example
A miller cleans wheat, conditions it, mills it into atta and packs it in 5 kg bags. Identify the processing level. Reasoning: cleaning and sorting are primary steps; milling converts grain into a stable flour that is still an ingredient, not a ready-to-eat food. The operation is therefore chiefly primary processing, with packaging supporting distribution. If the same flour were mixed, baked and packed as biscuits, that would add secondary processing.
Traps that cost marks
- Treating food science as only nutrition; it also covers chemistry, microbiology, engineering and sensory science.
- Calling every packet "tertiary processing"; tertiary refers to further convenience or service, not merely packaging.
- Assuming processing always lowers nutrition; blanching, drying, freezing and fortification can preserve or improve nutrient availability.
- Confusing food technology with food processing; technology is the application and control of processing at scale.