Studies On The Extraction And Stability Of Fructus Lycii Pigment

The paper used Fructus Lycii dregs which was produced in Xinjiang as raw material to study excellent extraction efficiency of Fructus lycii Pigment by organic solvent and microwave extractions .The optimum extracting conditions were got. The condition were temperature 50℃,for 1.5hours every times ,ratio of liquid to material was 3:1(V/W) , four times with petroleum ether-acetone(4:1 V:V).Under these conditions, the extraction rate was 91.6%. The result showed that by single factor experiments and orthogonal test :the microwave extractions optimum extraction condition was microwave power 80%, for 20s every times , ratio of liquid to material was 3:1(V/W) ,three times, the extraction rate was 89.5%. It had been found pH,antioxidants,preservatives have little effect on pigment ,but heating,light,oxidants and metal irons Cu2+,Fe2+ ,Fe3+have evident effect by studied the stability of Fructus lycii Pigment. By the study of antioxidant activity, when the concentration of pigment was 10mg/100ml , the scavenging rate to﹒OH was 52.3%,the scavenging rate of Vc was 83.2% at the same concentration .When the reaction happeded after four minutes, the scavenging rate of Vc was 34.5%,the scavenging rate of pigment was 15.7%. It showed Fructus lycii Pigment have scavenging effect on free radicals.