tExtraction and purification of anthocyanins from purple-fleshed potatoes was investigated.The effects of pretreatment method, time, and ethanol concentration on the extraction werestudied. Boiling was the most efficient pretreatment method for the extraction. Extractiontime and ethanol concentration were found to have only minor effect on the extractionyield. Six hour extraction time and 20 vol.% ethanol concentration were found to be suf-ficient. The resulting anthocyanin-rich extract contained glucose, proteins, amino acids,and unidentified compounds as impurities. Removal of these by adsorption was studiedwith six commercially available adsorbents, of which Amberlite XAD-7HP was the mostefficient. Anthocyanin purification with XAD-7HP was studied in a column. The effects offlow 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.