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The Nutritional Value and Biological Activity of Concentrated Protein Fraction of Potato Juice

1
Institute of Food Technology of Plant Origin, Poznań University of Life Sciences, 60-624 Poznań, Poland
2
Department of Biotechnology and Food Microbiology, Poznań University of Life Sciences, 60-627 Poznań, Poland
3
Department of Technology and Instrumental Analysis, Poznań University of Economics and Business, 61-875 Poznań, Poland
4
Department of Biochemistry and Food Analysis, Faculty of Food Science and Nutrition, Poznań University of Life Sciences, 60-623 Poznań, Poland
*
Author to whom correspondence should be addressed.
Nutrients 2019, 11(7), 1523; https://doi.org/10.3390/nu11071523
Received: 20 May 2019 / Revised: 2 July 2019 / Accepted: 3 July 2019 / Published: 4 July 2019
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Abstract

Potato protein is recognized as one of the most valuable nonanimal proteins due to the high content of essential amino acids. So far, it has not been used in human nutrition on a large scale due to technological limitations regarding its acquisition. In this study, the protein fraction of potato juice was concentrated with the use of membrane separation. The obtained potato juice protein concentrate (PJPC) was characterized in terms of nutritional value and biological activity, and the amino acid composition, mineral content, and antioxidant properties were determined. Moreover, in vitro cytotoxic activity against cancer cells of the gastrointestinal tract was investigated. The results of the present study indicate that PJPC is an excellent source of lysine and threonine, while leucine is its limiting amino acid, with an amino acid score (AAS) of 65%. Moreover, PJPC contains substantial amounts of Fe, Mn, K, and Cu. As demonstrated experimentally, PJPC is also characterized by higher antioxidant potential than potato itself. Biological activity, however, is not limited to antioxidant activity alone. Cytotoxicity studies using a gastric cancer cell line (Hs 746T), a colon cancer cell line (HT-29), and human colon normal cells (CCD 841 CoN) proved that PJPC is characterized by selective activity against cancer cells. It can thus be concluded that the developed method of producing protein concentrate from potato juice affords a product with moderate nutritional value and interesting biological activity. View Full-Text
Keywords: potato juice; cancer cells; cytotoxicity; antioxidant activity; protein nutritional value; chemical score; protein composition potato juice; cancer cells; cytotoxicity; antioxidant activity; protein nutritional value; chemical score; protein composition
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kowalczewski, P.Ł.; Olejnik, A.; Białas, W.; Rybicka, I.; Zielińska-Dawidziak, M.; Siger, A.; Kubiak, P.; Lewandowicz, G. The Nutritional Value and Biological Activity of Concentrated Protein Fraction of Potato Juice. Nutrients 2019, 11, 1523.

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