Results:Rape seed press cake contained the highest contents of phenolics. The highest contents ofproanthocyanidins were found in faba bean (470 ± 14 mg/100g DW). Secoisolariciresinol-diglucosidecontent in the flaxseeds was 138 ± 32 mg/100 g DW and the lignanamide content of hemp seeds was77 ± 22 mg/100 g DW. The content of phytic acid in rapeseed cake, hemp seed and flaxseed sampleswas 3.9 ± 0.1, 3.5 ± 0.2, and 1.9 ± 0 g/100 g DW, respectively. Rape seed cake contained glucosinolates 2.08 ± 0.74 umol/g DW and faba bean contained vicine and convicine 0.77 ± 0.11 and 0.42 ± 0.02 g/100 g DW, respectively. Quinoa contained saponins 557 mg/100 g DW and after abrasive milling/pearling the content was 36 mg/100 g DW. Generally, the phytochemicals were concentrated in theouter shell of the seed. Inhibitory activities against proteolytic enzymes, trypsin and α-chymotrypsin,varied among the samples analyzed. Highest activity was found in buckwheat samples, whereas lupinand rapeseed press cake had no inhibitory activity against tested enzymes. 

Conclusions: This paper presented new findings on the contents of phytochemicals in various underusedplant protein sources.