Study on the main quality properties of black peanut and the black peanut skin pigment extracting technology

Oil and protein content was compared between black peanut (cultivar Mianxin No.1) with some other peanut cultivars (Zhonghua No.4;Silihong;Caihua No.1;W2-7;Hua 312). Furthermore,the extracting technology of black peanut skin pigment was studied. The orthogonal design method was applied in studying the parameters of the extract technology of the black peanut skin pigment (BPSP) by ethanol. Black peanut skin contained high amount of anthocyanins(4.93mg /g).By orthogonal experiment,the optimum extractive technique parameters were:ethanol concentration 50%,extractive temperature 60℃,the mixture ratio of the black peanut skin to the solvent was 1 ∶50 and the extractive time was 80 min. In this circumstance,the ratio of extraction reached to 4.68mg/g,which was 94.9 percent of the total anthocyanins in the black peanut skin.