METHOD FOR IMPROVING FREEZE CONCENTRATION QUALITY OF FRUIT JUICE WITH THE ASSISTANCE OF VARIABLE-VOLTAGE DIRECT-CURRENT ELECTRIC FIELD

摘要

Disclosed is a method for improving freeze concentration quality of fruit juice with the assistance of a variable-voltage direct-current electric field, comprising the following steps: after placing fruit juice in a cold storage for pre-freezing; opening a condensation circulating device so that the temperature of a sample tank is consistent with that of the cold storage; then placing the fruit juice into the sample tank; lowering the temperature thereof to -5 to -20ºC and performing 50-200V/cm electric field treatment on same at the same time; after nucleation occurs in the fruit juice, increasing voltage to 250-1000V/cm, so that the fruit juice is crystallized and freeze-concentrated until the freeze concentration is completed; and finally performing solid-liquid separation and aseptic filling.