Potato protein is recognized as one of the most valuable non animal proteins due to the\nhigh content of essential amino acids. So far, it has not been used in human nutrition on a large\nscale due to technological limitations regarding its acquisition. In this study, the protein fraction\nof potato juice was concentrated with the use of membrane separation. The obtained potato juice\nprotein concentrate (PJPC) was characterized in terms of nutritional value and biological activity, and\nthe amino acid composition, mineral content, and antioxidant properties were determined. Moreover,\nin vitro cytotoxic activity against cancer cells of the gastrointestinal tract was investigated. The results\nof the present study indicate that PJPC is an excellent source of lysine and threonine, while leucine is\nits limiting amino acid, with an amino acid score (AAS) of 65%. Moreover, PJPC contains substantial\namounts of Fe, Mn, K, and Cu. As demonstrated experimentally, PJPC is also characterized by higher\nantioxidant potential than potato itself. Biological activity, however, is not limited to antioxidant\nactivity alone. Cytotoxicity studies using a gastric cancer cell line (Hs 746T), a colon cancer cell line\n(HT-29), and human colon normal cells (CCD 841 CoN) proved that PJPC is characterized by selective\nactivity against cancer cells. It can thus be concluded that the developed method of producing protein\nconcentrate from potato juice affords a product with moderate nutritional value and interesting\nbiological activity.
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