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considered as evaluation criteria. The highest yields of hydrophilic extrac- tives were found in barks of grey alder and aspen (36.8 and 22.9%, respectively). In the former, the highest antioxidant activity was found towards free radicals (DPPH• and ABTS•q) and superoxide anion radical. Open chain diaryl- heptanoids, mainly oregonin, were identified as the major constituents of the grey alder hydrophilic extract. In addition to oregonin, the presence of 2 linear diarylheptanoids wpla- typhylloside and 1,7-bis-(3,4-dihydroxyphenyl)-heptane-5- O-b-D-glucopyranosidex was

metabolite ( Wink 2008 ). For example, oregonin was thus far identified only within Alnus and Corylus genera (Betulaceae) ( Choi 2013 ; Riethmüller et al. 2016 ), with the exception of Pinus flexilis (Pinaceae) ( Lee et al. 1998 ). The genera Curcuma , Alpinia and Alnus are represented mainly, but not exclusively, by the occurrence of linear diarylheptanoids ( Claeson et al. 2002 ; Lv and She 2012 ), whereas cyclic diarylheptanoid derivatives are a characteristic of Myrica and Morella species ( Silva et al. 2015 ). Substituents on the aromatic rings or on

, namely, diarylheptanoids ( Figure 1 , such as oregonin, hydroxyoregonin, Platyphylloside, and curcumin), should also be included into the study as well-known antioxidants. Linear diarylheptanoids and lignins are biosynthesized by the same pathway. Besides, they have a lot of structural similarities. They contain aliphatic chains, connected with the aromatic ring and similar functional groups (C=O and OH groups on side chains, and OCH 3 groups on aromatic rings). Both isolated lignins and diarylheptanoids are often connected with polysaccharides. The expectation is