Glucose, which is the main impurity in anthocyaninextracts of purple-fleshed potato, was not adsorbed to theXAD-7HP adsorbent (Fig. 6). Thus, a good separation of antho-cyanins from glucose could be obtained. After the loading step,the nonadsorbed solutes were removed from the adsorbentbed by water wash. The washing caused no desorption ofadsorbed anthocyanins (data not shown).Desorption of anthocyanins from XAD-7HP packed col-umn was carried out with aqueous ethanol solutions withdifferent ethanol concentrations and with and without aceticacid (Fig. 7 and Table 2).