Studies on Purple Corn Pigment Extraction Process and Product Stability

Purple corn pigment is extracted from purple corn,and its stability is studied.By single-factor test the effect of various process parameters on the purple corn pigment extraction rate is determined.Orthogonal experiment is designed selecting three factors,namely,the extraction temperature,extraction time,solid-liquid ratio.The purple corn pigment extraction process was optimized.The results show that the selected three factors affecting the size of purple corn pigment extraction rate of primary and secondary order:for the extraction temperature;extraction time;solid-liquid ratio,the optimum conditions were:80% ethanol and 0.2 mol /L citric acid mixture as the extracting agent,and the extraction temperature was 60 ℃,and the extraction time was 2 h and the ratio of material to solvent was 1:10.