of which Amberlite XAD-7HP was the most efficient. Anthocyanin purification with XAD-7HP was studied in a column. The effects of flow rate on adsorption, and ethanol and acetic acid concentrations on desorption wereinvestigated. In loading, a highly dispersed anthocyanins breakthrough curve was obtained.This most likely resulted from agglomeration of anthocyanins. Desorption of anthocyaninscould be done efficiently with 75 vol.% acidic (7 vol.% acetic acid) aqueous ethanol. All glu-cose and unknown impurities, together with 87% of proteins and amino acids, could beseparated from the anthocyanins. Process scale-up was demonstrated by processing 19 kgof purple-fleshed potatoes in a single batch