The perservative in liquid beverage was extrcated with n-hexane.The hexane layer was subjected to cyclodextrine polymer resin colume.The colume was eluted with aqueous solution of ethanol.
Active carbon used as preseparation agent, from which the SO42- is easily eluted has high adsorbance for four dyes.In addition, it is cheap and easily got as well.
In order to optimize the washing and eluting solution, the adsorption of fisetin in different solutions was studied.It was found that the fisetin and analogue quercetin were separated primely.