Core paper · Year 3 · Sem 5

Food Preservation

4 credits5 units · 26 topicsInternal 25Exam 75

Prep tip

Most long answers here are a process or a comparison: learn canning, jam and jelly, squash, ketchup, pickle and freeze-drying as numbered steps with their temperatures, keep one table each for dryers, freezing methods and packaging materials, and add an Indian product (mango pickle, guava jelly, vadam, papad) to every answer.

Suggested order: Unit I, then II, then III, then IV, and V last.

Units

Unit I0 of 5 read

Food spoilage and principles of preservation

5 sheets · about 35 min reading

Food spoilage: meaning, causes and factors8 min Microorganisms that spoil common foods9 min Classification of foods by shelf life5 min Food preservation: definition, principles and importance7 min Classification of preservation methods: bactericidal and bacteriostatic6 min

Unit II0 of 6 read

Preservation by high temperature

6 sheets · about 44 min reading

Heat preservation and blanching7 min Pasteurisation7 min Sterilisation and UHT processing7 min Canning10 min Extrusion cooking6 min Dielectric heating and dehydration7 min

Unit III0 of 4 read

Preservation by low temperature

4 sheets · about 30 min reading

Low-temperature preservation and refrigeration8 min Freezing: principle and methods9 min Changes during freezing, frozen storage and thawing7 min Dehydrofreezing and comparison of low-temperature methods6 min

Unit IV0 of 5 read

Drying, concentration and evaporation

5 sheets · about 39 min reading

Drying: principles and sun drying8 min Tray, tunnel and fluidised-bed drying8 min Spray drying and drum drying8 min Freeze drying (lyophilisation)8 min Concentration, evaporation and non-thermal methods7 min

Unit V0 of 6 read

Sugar, salt, chemicals, smoking, irradiation and packaging

6 sheets · about 57 min reading

Preservation by sugar: jam, jelly and marmalade10 min Practical: squash, fruit beverages, sauce and ketchup9 min Preservation by salt and pickling9 min Food additives and chemical preservatives10 min Smoking and irradiation9 min Food packaging and labelling10 min

How the 100 marks split

Internal · Tests (best 2 of 3)10

Internal · Attendance5

Internal · Seminar5

Internal · Assignment5

End-semester exam75

Total100

The usual internal split. Your college may differ.Practise a model paper