Evaluation of Optimization of Extracting Process and Its Stability for Yellow Pigment from Pumpkin

Extracting process for yellow pigment from pumpkin was studied according to the single factor experiment.The optimized conditions were as follows: stirring,95% ethanol as extracting agent,the ratio of pumpkin to extracting agent was 1∶15,the temperature was 60 ℃,extracting 3 h. The experiment about stability of pumpkin yellow pigment showed that at room temperature,yellow pigment had certain inoxidability,reduction- resistant,stability to metallic ion,and decompose slowly. However,yellow pigment from pumpkin would be decomposed speed up at high temperature and illumination.