Sodium chloride absorb water and microorganisms die without water.
Drying is a method of food preservation that works by removing water from the food
I haven't done research on the subject, but I would think both drying out food was an early perservative as well as the use of salt.
Mummification.
There are numerous methods of food preservation, mainly depending on the purpose. Traditional food preservation techniques include curing, drying, refrigeration, freezing, smoking, pickling, canning, bottling and jellying. Industrial techniques include pasteurization, vacuum packing, Irradiation, Artificial food preservatives and bio-preservation.
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Sun drying, one of the oldest known methods of fruit preservation, originated thousands of years ago
dehydrating salt
Dehydration is removing water from food- drying it.
Smoking, salting, canning/bottling, drying, freezing, pickling
Several of the most popular methods of food preservation are: Smoking Salting Brining in salt water Canning or Jarring Vacuum sealing Irradiation Infusing with spices, such as pepper, curry, etc. Sugar curing Immersion in honey Refrigeration and freezing dehydration or drying underground storage.
Ernest Herman Wiegand has written: 'Home fruit and vegetable dehydration' -- subject(s): Drying, Fruit, Vegetables 'The frozen-pack method of preserving berries' -- subject(s): Berries, Frozen berries, Preservation 'Commercial dehydration of fruits and vegetables' -- subject(s): Drying, Fruit, Vegetables 'Effect of sulfur sprays on corrosion of prune cans' -- subject(s): Preservation, Prune, Spraying and dusting residues in agriculture 'Walnut drying and packing in Oregon' -- subject(s): Drying, Packing, Walnut 'Preservation of fruit and vegetables by freezing' -- subject(s): Frozen fruit, Frozen vegetables 'Commercial preservation of apple juice' -- subject(s): Apple juice, Preservation 'Maraschino cherries' -- subject(s): Cherry, Processing 'Drying prunes in Oregon' -- subject(s): Drying, Prune
Sodium chloride is not used in laboratory as a drying agent.