Abstract.The experiment by drying and freeze drying. The purpose and 2 method to study the use of the machine and the dried by hot air and freeze sublimation drying. Using the example is onion. Through reducing the size and then dried by hot air drying, using tray dry divided into 2 sample parts. Soaked with Sodium bisulfite and not through soaking Sodium bisulfite used drying and freeze drying using machine freeze dry experiment conclusion. Drying by sublimation drying. More efficient drying by drying. Because can maintain the flavor, color, and texture to it. Due to sublimation drying condition of low temperature and low pressure. The drying tray dry samples were not soaked Sodium bisulfite. Can not have color, smell, taste, because the heating process. The private in Sodium bisulfite can still maintain the color of green onion for.
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