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).