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Sugar is used as the humectant for candied intermediate moisture fruits, and salt is used for intermediate moisture vegetables and fish. [3] Additionally, a mixture of humectants can be formulated to manipulate the sensory properties of the food product. [2] Osmotic drying using a humectant results in a soft texture in the final product. [2]
Osmotic dehydration is an operation used for the partial removal of water from plant tissues by immersion in a hypertonic solution. Sugar or salt solutions are used to reduce the moisture content of foods before actual drying process. This technique is used to give the product quality improvement over conventional drying process.
Fish are preserved through such traditional methods as drying, smoking, and salting. [1] A whole potato, sliced pieces (right), and dried sliced pieces (left), 1943. Food drying is a method of food preservation in which food is dried (dehydrated or desiccated). Drying inhibits the growth of bacteria, yeasts, and mold through the removal of water.
Freeze-drying is a special form of drying that removes all moisture and has less effect on the taste of food than normal dehydration. Freeze drying is a water removal process commonly used to preserve pear material. The fruit is placed in a vacuum chamber at low heat to increase shelf life.
“The freeze-drying process uses lower temperatures than traditional drying methods, which helps the fruit retain a higher percentage of vitamins, antioxidants and polyphenols,” explains Jaclyn ...
Many processes designed to preserve food involve more than one food preservation method. Preserving fruit by turning it into jam, for example, involves boiling (to reduce the fruit's moisture content and to kill bacteria, etc.), sugaring (to prevent their re-growth) and sealing within an airtight jar (to prevent recontamination).
The liner sits elevated from the rest of the storage container so you can be sure that moisture — the enemy of fresh produce — does not come in contact with your fruits and vegetables.
The water content of food is usually very high, typically 80–95% for various fruits and vegetables and 50–75% for various meats. Removing moisture from food restrains various bacteria from growing and spoiling food, as well as dramatically reducing the weight and often the volume of the food, making it easier to store.