Abstract:

Resin NKA-Ⅱ was selected as the best one among eight kinds of macroporous resins for the purification of
polyprenols (PPs) from Ginkgo biloba leaves in terms of its highest adsorption rate for PPs. The adsorption behavior of
PPs on NKA-Ⅱ resin was further investigated and optimum parameters for adsorption and desorption were procured. The
data showed that the adsorption behavior of PPs on NKA-Ⅱ resin followed the first order kinetic equation. The adsorption
process was mainly affected by film diffusion. The adsorption isothermal curve obeyed both Freundlich and Langmuir
isotherm equations. PPs were separated by a fixed bed packed with NKA-Ⅱ resin under the operating conditions as follows:
0.73 mg/mL of the sample was loaded onto the column at a flow rate of 2 mL/min and eluted with 5 BV of hexane-acetone
(80:20, V/V) at a flow rate of 1 mL/min. Under these conditions, the content of PPs increased from 33.85% to 71.54%,
and the recovery was 88.76%. After the sixth regeneration, its separation capacity for PPs began to significantly decrease,
showing a good regenerability.

Key words: macroporous resin, adsorption, polyprenols