Condition optimization for extracting β-carotene in carrot by frozen-ultrasonic

β-carotene,the source of the vitamin A in human body,is an important functional substance to the health of a person.This experiment studied the effect of different solvent extraction,proposed the freeze-microwave thawing method to achieve broken cell wall materials and to reduce moisture in the purpose.The study can reduced 45% moisture for carrot.With ultrasonic assisted extraction for the technology,The result showed that the optimal process parameters were:the temperature of ultrasonic was 40℃,the ratio of material and liquid was 1 ∶6(g/mL),the treatment time was 3 with 20min.each time,β-carotene extraction rate could reach more than 85%.