关键词: 玫瑰茄, 红色素, 树脂, 吸附, 提取

Abstract:

Red pigments from Hibiscus sabdariffa L. were extracted with HCl solution (pH 3), and then were separated from the extract with 7 macroporous resins. According to the adsorption efficiency to the red pigments, resin HPD-100 was selected for the further study concerning adsorption and desorption conditions for achieving the best separation effect of the red pigments. Results showed that the best adsorption efficiency was achieved when pH value of the extract was 3.0, at 40－60 ℃ the HPD-100 exhibited the highest adsorption efficiency, and the time to reach adsorption equilibrium was 150 min with the adsorption efficiency of 96.90%; the best desorption effect of the red pigments was achieved by using 90% ethanol as the elution solvent. After being used repeatedly 20 times, the HPD-100 still had good adsorption capability.

Key words: Hibiscus sabdariffa L., red pigment, macroporous resin, adsorption, extraction