Study on the Extracting Process and Stability of Pigment from Pumpkin Residue

In this experiment,used pumpkin residue which was underwent extraction of polysaccharides as raw material,stuied the microwave assisted extraction and stability of pumpkin pigment.The results showed that the optimum conditions of extraction was ethanol:ether(volume ratio)3∶2,solid to liquid ratio 1∶30,temperature 60 ℃,extracting 3 h.The pumpkin flesh pigment was a nature and stability of excellent natural pigment,the pigment was stable in every pH value,and was more stable under alkaline and neutral conditions.In low and medium concentration of H2O2,the pigment had a degree of oxidation resistance ability,but the ability was poor in high concentration of H2O2.Some decomposition occurred in high temperature,and it was sensitive with light.