Effect of farming systems on the quantitative and qualitative composition of phenolic acids in potato tubers with different coloured flesh

Agricultural systems and cultivation technologies applied have an impact on the biochemical composition and quality of potato tubers. Therefore, the aim of the present study was to investigate the effects of different farming systems on the quantitative and qualitative composition of phenolic acids in potato tubers with coloured flesh. Five potato cultivars with different coloured flesh (Laura, Tornado, Red Emmalie, Violetta, Salad Blue) were cultivated at a farm in the Širvintos district of Lithuania. Potatoes were grown following traditional potato production technology in conventional, organic and biodynamic farming systems. The concentrations of phenolic acids and their derivatives were determined with a method described by Hallmann (2012)1 using the HPLC equipment. The results show that biodynamic potato contained significantly higher concentrations of total phenolic acids and most of individual phenolic acids (chlorogenic and p-coumaric acids), in comparison with the organic and conventional. Hovewer, conventional potato contained significantly more gallic acid. The cultivar effect on the concentrations of total phenolic acids and individual phenolic acids was also identified. Tornado cultivar contained significantly more of total phenolic acids (141.43 mg 100 g-1 DM), chlorogenic acid (138.13 mg 100 g-1 DM), caffeic acid (1.17 mg 100 g-1 DM) and p-coumaric acid (0.74 mg 100 g-1 DM) in comparison to other studied cultivars. However, Laura cultivar contained significantly more of gallic acid (1.75 mg 100 g-1 DM)Agronomijos fakultetasLietuvos sveikatos mokslų universitetas. Medicinos akademijaVytauto Didžiojo universiteta