Potatoes preservation methods

Looking back also over the historical development of quality requirements for processed foods, freezing when properly carried out is undoubtedly the most satisfactory method for the longterm preservation of vegetable produce. The low temperatures commonly prescribed for frozen foods (—18°C) can maintain initial quality and nutritional value practically unchanged, so that frozen and fresh vegetable products differ only in texture (Canet, 1989), which is however a particularly important quality attribute in potato products. 

Cesium-137 has also been approved for the irradiation of certain foods. The radiation given off by the isotope kills bacteria and other organisms that cause disease. Foods irradiated by this method last longer before beginning to spoil. Wheat, flour, and potatoes are some of the foods that can be preserved by cesium-137 irradiation. 

A high molecular weight potato amylose was prepared by the urea dispersion method and it was preserved as a wet precipitate in ethanol(6o ) at +4°C ( ). Potato amylopectin was isolated from potato starch by the same method, and trace quantities of amylose from amylopectin fraction were removed by adsorption on defatted cellulose ( ). Amylose and... 

Potato strips are usually dried in concurrent rotary dryers of 1-3 m diameter and 5-15 m length. The inlet and outlet air temperatures are about 500°C and 100°C, respectively. The fresh potato strips are prepared by the sheer similar to one used in the sugar industry. The potato strips are dried to a final moisture content of 12% (wb). A significant portion of the dried potato strip is utilized as livestock feed since it is the most economical method of preserving potato. The details of rotary dryer can be found in Kelly [6]. 

All the fungi used in this study are those preserved in our laboratory. Trichophytons were examined on Sabouraud s culture medium and all the others on the potato-dextrose agar culture medium. For the qualitative test by the paper disc method, a few percent solution of crown ether in THF or in DMF was used. The ED,. values were determined as follows ... 

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