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. 2021 Apr 26;10(5):870. doi: 10.3390/plants10050870

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Total polyphenol content (TPC) of spruce bark extracts; (b) total tannin content (TTC) of spruce bark extracts; significant differences are represented by different letters (significance level α = 0.05); M1 US—P. abies (Maramureșului Mountains National Park site 1) extract produced by UAE, M2 US—P. abies (Maramureșului Mountains National Park site 2) extract produced by UAE, MT US—P. abies (Tașca) extract produced by UAE, MD US—P. abies (Dolhasca) extract produced by UAE, M1 M—P. abies (Maramureșului Mountains National Park site 1) extract produced by MAE, M2 M—P. abies (Maramureșului Mountains National Park site 2) extract produced by MAE, MT M—P. abies (Tașca) extract produced by MAE and MD M—P. abies (Dolhasca) extract produced by MAE.