HPD300 was suspended in ethanol overnight to remove
the monomers and porogenic agents entering the pores during
the synthetic process. Dynamic adsorption and desorption
experiments with solanesol were carried out on glass columns
(10 mm × 100 mm) wet-packed with 10 g wet resin. The bed
volume (BV) of the resin was 16 mL. Approximately 6 g of the
extract derived from MAE was dissolved in 20 ml methanol
and loaded onto the column. When reaching adsorptive
saturation, the column was first eluted with distilled water to
remove non-adsorbed impurities, and then with the eluent
was replaced by an ethanol–water solution. All of the dynamic
experiments were performed at room temperature.
The gradient elution tests were performed as follows. Firstly,
the eluent was 4 BV distilled water. Secondly, the eluent was
8 BV ethanol–water (50:50, v/v) solutions. Thirdly, the eluent
was switched to 8 BV ethanol-water solutions with a higher
ratio of ethanol (80:20, v/v). The eluent flow rate was 2 BV/h.
Finally, the column was regenerated with 95% ethanol. The
eluent was concentrated via rotary evaporation to give the