The Extracting of Millettia Dielsiana Pigment and the Study of its Stability

To provide important raw material for all kinds of new pigment used in food products,cosmetic and leechdom etc.Study on the stability of red pigment from millettia dielsiana and the condition of extraction.Ethanol was used as the extractant in the extracti on,and the pigment stability was investigated by UV spectrum.The optimum condition for ethanol extraction is:distilled water was used as the extractant and it was extracted under room temperature for 24h.The λmax for the pigment was 440nm,which has good solubility in water,bad Ph and light resistance characteritics was observed,however.Some common food additive,such as sodium benzoate,citrate,cane sugar,glucose,acetate,oxidizing agent,reducing agent,metallic ions haveno effect on the stability of the pigment.Starch has no effect on its stability.