The fruit and their fractions, such as peel, flesh, and seeds of seven selected Saskatoon berry genotypes were used in these studies. The research material contained “Martin”, “Pembina”, “Smoky”, and “Thiessen” cultivars (cvs.) and “no. 5/6”, “type N”, and “type S” clones [16 (link),17 (link)]. The fruit samples were collected from Skierniewice, Poland (51°55′24″ N, 020°5′58″ E). The raw material was directly frozen in liquid nitrogen and freeze-dried (24 h; Christ Alpha 1–4 LSC; Germany). The homogeneous dry material was obtained by crushing the dried tissues using a closed laboratory mill (IKA A.11, Germany). The powders were kept in a refrigerator (–80 °C) until extract preparation.
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