Abstract:The red pigment in cracked jujube was extracted by Soxhlet extraction method with cracked jujube powder as the raw material.Single factor test and response surface test were used to optimize the extraction process conditions，respectively，and the physicochemical properties（antioxidant activity and pigment stability）of the red pigment in cracked jujube were studied. The results showed that the optimal extraction conditions of Soxhlet extraction method were as follows：the addition amount of cracked jujube powder was 2.0 g∕100 mL；the volume fraction of ethanol was 69.00%；the heating temperature was 89 ℃；the leaching time was 26 min；the extraction time was 1.5 h；and the extraction rate of red pigment in cracked jujube was the highest（4.540 mg∕g）.Free radical scavenging activities of red pigment in cracked jujube on DPPH·，NO2-and ABTS+·were studied，the results showed that when the concentration of red pigment in cracked jujube reached 1.2 mg∕mL，the DPPH free radical scavenging rate could reach 67.8%；when the concentration of red pigment in cracked jujube reached 2.00 mg∕mL，the NO2- scavenging rate was 69.4%；when the concentration of red pigment in cracked jujube reached 1.5 mg∕mL，the ABTS+free radical scavenging rate reached 63.5%.The stability test of red pigment in cracked jujube showed that the red pigment extracted from cracked jujube by Soxhlet extraction had good thermal stability，light had a certain influence on its stability，and pH had a greater influence on the stability of red pigment.