Abstract: Using water as the solvent,natural pigment was extracted by microwave technology. The results showed that microwave irradiation could improve the extraction efficiency of natural pigment to as high as 11.15%. The most suitable conditions for the extraction were as follows: the power of microwave was in middle radiation and the time was six min, and the solid-liquid leaching ratio was 1:40.

Key words: Microwave extraction , Orthogonal test , Yellow pigment