The Study of Stability of Black Rice Pigment

In order to find out the stability of pigment from black rice,the pigment was extracted from black rice by distilled w ater w ith ultrasonic auxiliary means. The impacting factors on stability of the pigment w ere studied in this paper,such as illumination,pH,ultraviolet rays,temperature,and additives. The result show ed that ultraviolet rays had little effect on the stability of black rice pigment w ithin 80 minutes.In acid conditions,the tolerance of black rice pigment to illumination w as good. The influence of temperature on black rice pigment w as slight w ithin 20 ~ 80 ℃,but w hen the temperature w as over 80 ℃,the influence became great. The tolerance of black rice pigment to table salt and sucrose w as good,and it could be used w ith them together. Sodium benzoate and hydrogen peroxide had great influence on black rice pigment. In acid conditions,Vc and citric acid had little influence on black rice pigment. The color of black rice pigment could be greatly influenced by acidity. The pigment w as more steady in acid conditions,the color w as best,and it could be used in acid foods. This study provided some theory evidence for application of black rice pigment.