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Vacuum frying process
In recent years, consumer’s preference for low-fat and
fat-free products has been the driving force of the snack
food industry to produce lower oil content products that
still retain the desirable texture and flavor. Vacuum frying may be an option for production of fruits and vegetables with low oil content and the desired texture and flavor characteristics. It is defined as the frying process that is carried out under pressures well below atmospheric levels, preferably below 50 Torr (6.65 kPa). Due to the pressure lowering, the boiling points both of the oil and the moisture in the foods are reduced. Vacuum frying poses some advantages that include: (1) can reduce oil content in the fried product, (2) can preserve natural color and flavors of the product due to the low temperature and oxygen content during the process, and (3) has less adverse effects on oil quality; and (4) can produce potato chips with no acrylamide content.
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