Preservation by drying

Comparing Since the time of the Incas, people living in the Altiplano of Peru and Bolivia have eaten chuno, potatoes that have been preserved by drying in cold, dry air at 4000 m above sea level. Compare this practice with freeze drying. 

Many plants, used as spices or flavor ingredients, are preserved by drying and are ideal matrices for SFE. Once ground to a powder, they have a large surface area and are highly permeable, leading to rapid and efficient extractions. Interest in SFE of plants has principally been for the isolation of essential oils, but recently SFE has also been used to obtain pharmaceutically active compounds. The extraction of the sesquiterpene lactone parthenolide (Fig. 5) from feverfew plants has been described by Smith (30) and Smith and Burford (31). SFE was compared with steam distillation and solvent extraction. While SFE extracted the less-volatile lactones and parthenolide, the steam distillation extracted the volatile terpenes. SFE resulted in incomplete extraction compared... 

There are two possible ways for the proper preservation by drying by using fossil fuels and by using solar energy. Not considering the disadvantageous environmental pollution effects caused by the CO2, SO2, and NO emission, the use of fossil fuel fired or electrically powered dryers is limited and inappropriate for most of the farmers in developing countries. The main reasons are as follows ... 

Santivarangkna, C., Kulozik, U., Foerst, P. (2008). Inactivation mechanisms of lactic acid starter cultures preserved by drying processes. Journal of Applied Microbiology, 705(105), 1-13. 

Strips of fresh meat ean be preserved by drying. In one process, the strips are coated with table salt and exposed to the air. Use a process discussed in this ehapter and one discussed in Chapter 6 to explain how the drying takes place. 

Fish can be preserved by drying naturally in the sun or in drying installations. 

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