Deep-fat
frying generally involves three types of mass transfer such as (a)
migration of water from the core of the food to the surface, which is
removed during frying, (b) absorption of frying oil into the food and
(c) leaching of liquefied food components from the food (Blumenthal,
1991). In order to produce healthy snack products, it is
necessary to understand the mechanism of the frying process. After
frying, the oil present on the surface migrates into the core
structure due to the condensation of vapor inside the product
resulting in the creation of a vacuum (Gamble, Rice & Selman, 1987;
Moreira, Sun & Chen, 1997).