Abstract: Peel pigment was extracted from "Xuefeng" tangerine peel with CO2 supercritical extraction technology. The stability of the pigment under different conditions was studied by determining absorbance with ultraviolet and visible spectrophotometry at the biggest absorption wave length. The experimental results showed that its stability is influenced by illumination,time,temperature,metal ions and oxidant agent at different degrees. There are more obvious influence of long time illumination to pigment stability. The stability is also influenced by hydrogen peroxide,but 0.5%,1%,2% and 3% four concentrations of H2O2 have not obvious influence to the same samples. The pigment has the certain anti-oxidation. The influences of illumination,time,temperature,metal ions,oxidant agent on the stabilities of the peel pigments under different extraction conditions are different. This indicateed that the components and contents of the peel pigment under different extraction conditions are different.

Key words: "Xuefeng", tangerine； peel pigment； CO2 supercritical extraction； ultraviolet and visible spectrophotometry； stability；