Abstract
Osmotic dehydration can be considered as the most eligible energy-saving method for the partial removal of water from foods, if and even as a method of preservation in case of candy preparation. It can affect marked reduction in the moisture content of the foods before they are subjected to further processing steps such as drying, freezing, or frying. Pretreatment with osmotic solution having concentrations lower than the natural cell concentration can improve rehydration characteristics. Osmotic dehydration can also be used for the natural concentration of fruits, which helps in obtaining better characteristics of food prepared from them, such as jam. Application of various pretreatments to osmotic dehydration such as high hydrostatic pressure, high electrical field pulses, gamma irradiation, ultrasound, vacuum, and centrifugal force, can overcome the long existing issues related to the inherently slower mass transfer rates. With the advent of newer technologies involving adsorbence and membranes, the problem of handling used osmotic solution may find newer means of resolution, which will further increase the economical feasibility of this technology.
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