Abstract:

In order to using the macroporous adsorptive resins to study the purification condition of pigment from red pitaya peel and stability of the pigment after purification, By using static and dynamic experimental methods, the purification conditions were studied, the color scale of the purificatory pigment was calculated, and observe the stability of the purificatory pigment under different conditions. The results showed that, among the 5 macroporous resins tested, HPD100 resin was the best in adsorption effect and desorption effect. At room temperature, when 30% of ethanol was used as desorption solution, adsorption and desorption flow velocities were both 10 mL/min, the color scale of the purified pigment was 72.33, and it was 5.39 times higher compared with that before purification. Light was not conducive to the stability of the pigment, Na+, K+, Mg2+, Ca2+, EDTA and glucose had little effects on the stability of the pigment, however, Sn2+, citric acid and tartaric acid accelerated the degradation of the pigment. In a word, macroporous adsorptive resins could effectively separate and purificate the pigment from red pitaya peel, pigment should be stored in the dark, and avoid contact with Sn2+, citric acid and tartaric acid.