Study of Technics of Extracting Pigment from Purple Cabbage with Ultrasonic Aiding

In order to study the techniques of pigment from purple cabbage,the purple cabbage was used as materials,and ultrasonic was used as auxiliary means.Extraction solvent,liquid-solid ratio,temperature,power,time and pH were studied in this paper.The result showed that the optimal solvent was distilled water,and ultrasonic could improve the extraction yield.The maximum absorption wavelength of purple cabbage was 560 nm.The optimal liquid-solid ratio was 5∶ 1(mL/g),the optimal extracting temperature was 50 ℃,the optimal power was 70 W,and the optimal time was 20 min.The pigment of purple cabbage has different color in different pH.The pigment of purple cabbage has beautiful color,it is plentiful and safe,and it can be used in many different fields in the future.Some evidences were provided in this paper.