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. 2021 Aug 16;11(8):1221. doi: 10.3390/biom11081221

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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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Principal component analysis (PCA) of phenolic compounds of grape stem extracts from Mazuelo, Garnacha and Tempranillo varieties from vintages 2016 and 2018. (a) Variables graph: GA (gallic acid); CAT (catechin); Q (quercetin); Q3G (quercetin-3-derivative); M3G (malvidin-3-glucoside); ANT (unknown anthocyanin); RSV (trans-resveratrol); VIN (ε-viniferin); CAF (caftaric acid); EA (elagic acid); PB1 (procyanidin B1); (b) Individuals factor map. Individuals (Mazuelo 2016 and Mazuelo 2018; Graciano 2016 and Graciano 2018; Tempranillo 2016 and Tempranillo 2018) are presented in pink color.