Abstract: The microwave extraction and stability of the natural yellow pigment in the coat of peanut,grown in Fujian were studied.The optimum conditions for microwave extracting were:pH=3,70%(volume percent)ethanol as extraxtant,ratio of material to extractant lg:5ml,microwave power 120W and microwave irradiation time 200s.The kind of pigment could be applied to pH value widely,and presents best colour in base media.It had good light resistance,heat resisting property.Some common food additive was not affected on stability.The pigment had less resistance capability against oxidizing agent-H2O2,and had better endurance capability against reducing agent-Na2SO3.

Key words: The coat of peanut, Natural yellow pigment, Microwave extraction, Stability