Abstract
The purpose of this study was to characterize proteins from four different varieties of potato used in the Swedish starch industry. Proteins in potato fruit juices prepared from Prevalent, Senator, Saturna and Producent potatoes were analysed by gel filtration chromatography on a Sephacryl S-200 column, polyacrylamide gel electrophoresis (PAGE) in sodium dodecylsulphate (SDS) and isoelectric focusing (IEF). The major concentrations of proteins appeared at molecular weights of approximately 44 000, 20 000 and 14 000 without exception for the potato varieties characterized. A more complex pattern of proteins was revealed by isoelectric focusing than by SDS-PAGE. The pattern of proteins from isoelectric focusing revealed both acidic and basic proteins, some of them unique for a given potato variety.
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