Studies on the Ultrasound-assisted Extraction Purple Cabbage Pigment and its Stability

[Objective]The purpose was to discuss the method of extracting purple Cabbage pigment with ultrasound-assisted and its stability.[Method] The single factor and orthogonal tests of taking ultrasound-assisted extraction of the purple cabbage pigment were carried on to determine the optimum conditions and to study the stability of the pigment.[Result]The results indicated that the optimal conditions were determined as follows: ultrasound-assisted power was 80%,extraction time was 50 min,extraction temperature was 40 ℃,the extraction was water distilled,liquid-solid ratio was 40∶1(ml∶g).The effect of light on stability and at room temperature of it were high,while the effects of acid and alkali of the purple cabbage pigment were low,and the effects of food additives sucrose and citric acid were high and the effects of Vc and sodium benzoate were low.Antioxi-dant property of the purple cabbage pigment was high but anti-reductive property of it was low.K+,Na+,Cu2+,Mg2+,Zn2+,Ca2+ plasma had no influence on pigment impact,Fe3+,Al3+,Sn2+ and so on had an impact on the stability.[Conclusion] The method of extracting pigment can shorten the time of extraction,more effective and more economical.