Technology for recovering juice from citrus pulp with enzyme treatments and its pilot plant test

Citrus juice was recovered from pulp by enzyme. Taking composite indicator as the main index, the technology was optimized with enzyme dosage, reaction time, reaction temperature, and ratio of pulp to water dilution through single-factor test and responsible surface design. Best predicted composite indicator 0.0138 was got under the conditions: enzyme dosage of 213.38 mu g/L, reaction time of 164.02 min, reaction temperature of 53.76[degrees]C, and ration of pulp to water 1:1.05 (by weight). And it was proved correct that the composite indicator 0.0137 was got by the confirmative test. Meanwhile pilot plant tests were carried out based on the optimized technology. Changes of solid soluble, acid, pH and amino acids were studied during the tests. Recovered juice in the tests can alternatively replace restored juice in citrus beverage, since the similar results of the sensory evaluation.