Frying is basically a dehydration process and con- sidered by many to be more an art than a science or technology (Grob, 1990). Rice and Gamble (1989) re- ported that moisture loss during frying of potato slices was a mass transfer process and expressed in general terms as the ratio of driving force to the resistance to the flow. During deep fat frying, the fat acts as heating medium and it is immiscible with water. Most of the food materials contain a lot of water. Because of high
temperature, water within the food material gets heated and pumped out into the surrounding oil in the form of steam (Varela, Bender, & Morton, 1988). The interplay of water and oil in foods was explained earlier by Miller and Neogi (1985). Because of the immiscible nature of water and oil, they play a significant role in the deep fat frying operations. Keller and Escher (1989) reported these findings during deep fat frying of potato products. The viscosity and surface tension of the frying oil moderated this effect.
Frying is basically a dehydration process and con- sidered by many to be more an art than a science or technology (Grob, 1990). Rice and Gamble (1989) re- ported that moisture loss during frying of potato slices was a mass transfer process and expressed in general terms as the ratio of driving force to the resistance to the flow. During deep fat frying, the fat acts as heating medium and it is immiscible with water. Most of the food materials contain a lot of water. Because of hightemperature, water within the food material gets heated and pumped out into the surrounding oil in the form of steam (Varela, Bender, & Morton, 1988). The interplay of water and oil in foods was explained earlier by Miller and Neogi (1985). Because of the immiscible nature of water and oil, they play a significant role in the deep fat frying operations. Keller and Escher (1989) reported these findings during deep fat frying of potato products. The viscosity and surface tension of the frying oil moderated this effect.
การแปล กรุณารอสักครู่..
