Technical briefs - food

Being able to store and preserve food in a number of different ways is a vital part of food security.  

For people living in the developing world storing and preserving food enables them to have nutritious food for a longer period to feed their families and provide an income. 


Banana chips

Details of two different processes used to make nutritious banana chips, frying and drying.


Casein is a derivative of skimmed milk and is used as a raw material for thermoplastic materials formerly used for products such as insulators, handles, buttons, etc.

Clay evapourative cooler - research

Research into the design of the zeer pot clay refrigerator, where various variables have been investigated, results analysed and conclusions made.

Cold Storage of Fruits and Vegetables

Lowering the temperature to an appropriate level can slow down the deterioration of fruits and vegetables.

Cured meat products

Curing is used to preserve meat either by the use of salt, reducing water content or smoking.

Drying technologies

Drying is the most widely used method of preserving food globally.

Evaporative cooling - zeer pot

Low cost technologies which use evaporative cooling are an effective solution to the problem of post-harvest loss of fruits and vegetables in the developing world.

Fruit Juice Processing

Different ways of processing fruit juice are described, as well as a possible quality control.

Fruit leathers

Made by drying a thin layer of fruit puree, fruit leathers are a good way of retaining nutrients in a preserved food.

Jams, jellies and marmalades

The techniques used to make jams, jellies and marmalade for a variety of fruits and how to ensure the the correct acidity and sugar levels during processing.

Lime Juice Clear Cordial

The manufacturing system capable of producing lime juice cordial using simple comparatively low-cost equipment is explained.

Pickled Papaya

How to make pickled papaya and the principles behind this type of food preservation technique.

Solar Drying

The heat from the sun coupled with the wind is used to dry food crops for preservation and timber. The basic principles of solar drying are explained as well as the construction of solar tunnel dryers.

Fireless cookers

For more technical briefs on food please visit Practical Action's main website.  Access is free but you will be required to register.

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