Study on microwave extraction of red pigment from pericarp of purple potato

Using single factor and orthogonal test,a red pigment was extracted from pericarp of purple potato by microwave technology.In order to determine optimum extraction condition,the microwave power,the microwave time and the ratio of material to solvent was tested.By comparing the extraction rate of these methods,the chief influence factor on the extraction efficiency of pigment is the microwave power,then the microwave time and the material-solvent ratio.The optimum extraction condition was:the extraction solvent 1% HCl,the microwave power 400W,the microwave time 15min and the material-solvent ratio 1 ∶10(g/mL).The parallel experiment was repeated 3 times at the optimum extraction condition,and the average extraction rate of red pigment was 86.79%.It was improved 15.85% than the traditional solvent extraction.Our conclusion is that microwave technology can improve the extraction of red pigment of purple potato.