What is freeze drying?

Please check out this explanation about freeze drying...

What is freeze drying?

Freeze drying is an industrial method used for the preservation of food and medicines. It involves drying things at temperatures below freezing. The technique is used to dry foods and is a four-step process.

Firstly, the food is prepared and then quickly frozen at very low temperatures, usually around -40°C. This step is important as it reduces the chance of damage caused by freezing. The faster the food is frozen, the smaller the ice crystals will be, which is better for the drying process.

After freezing, the food is dried in two steps. The first step involves reducing the air pressure, and then slowly removing the majority of the ice by sublimation, which takes several days. Sublimation means that the ice does not defrost first, but instead evaporates directly from its solid form. This process takes place at a temperature that is tens of degrees below freezing. Although sublimation takes longer under these low temperatures, it ensures optimum preservation of flavour and texture. In the final stage, the food is dried to remove the last traces of water.

Advantages of Freeze-drying

Freeze drying of food has the following advantages:

  • The general advantage of freeze drying is improved preservation. Micro-organisms such as bacteria cannot multiply in a too dry environment.
  • The shelf life of the food is extended considerably.
  • The food retains all its good nutrients. Freeze-dried fruit and vegetables, for example, remain full of vitamins and minerals.
  • The taste and texture are better preserved this way.
  • The volume and weight decrease, so the food takes up less space.

For more information about freeze-drying, check out this informative blog post

Freeze Dried products

There are many fruit and vegetable products that can be freeze-dried to retain their healthy properties and extend their shelf life. Our range includes the following freeze dried products:

Strawberry Powder, Acai Powder, Apple Powder, Blueberry Powder, Goji Berry Powder, Maqui Berry Powder.