Research Progress on the Application of Pretreatment Methods and Combined Techniques in Vacuum Freeze-Drying of Fruits and Vegetables
Vacuum freeze-drying can retain the original quality and nutritional value of fruits and vegetables to the maximum extent,but there are problems such as long processing time,high energy consumption.This paper mainly introduces six pretreatment methods(ultrasonic,high voltage pulsed electric field,vacuum cooling,blanching,solution treatment and other pretreatment methods)and four combined techniques(hot air-vacuum freezing combined drying technology,spray-vacuum freezing combined drying technology,microwave-vacuum freezing combined drying technology and infrared-vacuum freezing combined drying technology)in vacuum freeze-drying of fruits and vegetables,in order to provide theoretical reference for the development in this field.
vacuum freeze-dryingfruits and vegetablespretreatmentcombined techniques
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