Freeze Dried Bananas

Freeze Dried Bananas

Overview of basic principles
Freeze-Drying, also known as freeze-drying, is a technology for preserving food. For freeze-dried bananas, the core principle is to sublimate the water in the banana directly from solid to gas under low temperature and low pressure environment, so as to obtain dehydrated banana products.
Specific production process principle
Pre-freezing stage:
First, pre-process the fresh bananas, such as peeling and slicing. Then put the banana slices into a low temperature environment (generally between -40℃ and -80℃) for rapid freezing. The principle of this step is to form ice crystals in a short time by rapidly cooling the water in the banana. The formation of ice crystals is critical because it affects the efficiency of subsequent sublimation and the quality of the product. If the freezing speed is too slow, the water will form larger ice crystals, which may destroy the cell structure of the banana during the sublimation process, resulting in poor texture of the product.
Sublimation stage:
When the banana slices are fully frozen, they are placed in a vacuum drying chamber, and the pressure in the chamber is reduced by a vacuum pump to maintain a very low level (usually between tens of Pa and hundreds of Pa). In this low-pressure environment, ice crystals will directly sublimate from solid to gas (this process does not go through the liquid stage). The principle of sublimation is that when the external pressure drops to a certain level, the saturated vapor pressure of solid ice is greater than the external pressure, and the ice will directly turn into water vapor. This process requires the absorption of heat, so in the sublimation stage, the heating system will provide appropriate heat to the banana slices to maintain the continuous sublimation, but the heating temperature is generally controlled at a low level (for example, 0℃ - 30℃) to avoid local overheating of the banana slices and cause quality degradation.
Analysis and drying stage:
After the sublimation stage, a small amount of bound water will still remain in the banana slices. At this time, analytical drying is required to further reduce the moisture content of the banana slices. This stage mainly removes the residual bound water in gaseous form by increasing the temperature (generally between 30℃ - 60℃) and reducing the pressure. This process is also based on the principle that water molecules are more likely to diffuse from the surface and inside of the material under high temperature and low pressure, so that the banana slices reach an extremely low moisture content (usually between 1% - 5%), and obtain high-quality freeze-dried banana products.

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