Variability in the composition of phenolic compounds in winter-dormant Salix pyrolifolia in relation to plant part and age Author Lavola, Anu ∗ & Department of Environmental and Biological Sciences, Natural Product Research Laboratories, University of Eastern Finland (UEF), P. O. Box 111 FI- 80101 Joensuu, Finland Author Maukonen, Merja Author Julkunen-Tiitto, Riitta text Phytochemistry 2018 2018-09-30 153 102 110 http://dx.doi.org/10.1016/j.phytochem.2018.05.021 journal article 285689 10.1016/j.phytochem.2018.05.021 724fd970-7ae0-4aaa-b429-cf11db084063 1873-3700 10483857

Table 3 Concentrations (mg g −1 dry wt ± s.e.) of phytochemicals in the wood of winter-dormant S. pyrolifolia in the current-year and previous-year growth of 1-. 3- and 20- year-old trees. Different letters (a – c) express the statistically significant differences (p <0.05) in the amount of a compound due to age.

Compound	Wood 1-y current	Wood 3-y current	Wood 20-y current	Wood 3-y previous	Wood 20-y previous
Salicylate glucosides
Salicin	2.72 ± 0.58 a	2.29 ± 0.21 a	2.60 ± 0.22 a	1.03 ± 0.11 b	1.35 ± 0.16 b
HCH-derivative of salicin	0.46 ± 0.11 ab	0.40 ± 0.11 a	0.64 ± 0.07 b	0.17 ± 0.05 c	0.22 ± 0.03 c
Salicortin	3.79 ± 0.36 a	5.60 ± 0.79 a	7.94 ± 1.29 a	1.42 ± 0.38 b	0.94 ± 0.19 b
Disalicortin	–	0.11 ± 0.04 a	0.32 ± 0.04 b	–	0.03 ± 0.03 c
Simple phenolic glucosides
Picein	0.41 ± 0.17 ab	0.19 ± 0.03 a	0.57 ± 0.09 b	0.49 ± 0.15 ab	0.55 ± 0.10 ab
Triandrin	0.41 ± 0.39 a	0.06 ± 0.01 a	0.20 ± 0.09 a	0.33 ± 0.13 a	0.10 ± 0.01 a
Salireposide	0.18 ± 0.09 a	0.08 ± 0.01 a	0.25 ± 0.05 a	0.04 ± 0.01 a	0.08 ± 0.01 a
Phenolic acids
p -OH-Cinnamic acid-glucoside	0.02 ± 0.00 a	0.01 ± 0.00 a	0.01 ± 0.00 a	–	0.01 ± 0.00 a
5-Caffeoylquinic acid (Chlorogenic acid)	0.03 ± 0.01 a	0.06 ± 0.00 a	0.05 ± 0.00 a	–	0.02 ± 0.00 a
Flavonoids
Isosalipurposide (Phloridzin)	0.82 ± 0.53 a	0.11 ± 0.03 a	0.09 ± 0.01 a	0.48 ± 0.30 a	0.11 ± 0.02 a
Naringenin 5- O -glucoside (Salipurposide)	0.15 ± 0.08 a	0.03 ± 0.01 a	0.07 ± 0.01 a	0.12 ± 0.07 a	0.09 ± 0.02 a
Naringenin 5- O -glucoside derivative	0.25 ± 0.13 a	0.07 ± 0.01 a	0.14 ± 0.02 a	0.21 ± 0.11 a	0.16 ± 0.03 a
Naringenin 7- O -glucoside (Prunin)	0.16 ± 0.07 a	0.07 ± 0.04 a	0.08 ± 0.02 a	–	0.06 ± 0.01 a
Quercetin 3 -O -galactoside (Hyperin)	–	0.02 ± 0.01 a	0.04 ± 0.01 a	–	0.01 ± 0.00 a
Quercetin 3- O -glucoside (Isoquercitrin)	–	–	0.04 ± 0.01 a	–	0.02 ± 0.00 a
Kaempferol 3- O -glucoside (Astragalin)	–	–	0.05 ± 0.01 a	–	0.02 ± 0.00 a
Catechin	1.90 ± 0.37 a	0.81 ± 0.06 b	1.12 ± 0.09 c	0.41 ± 0.09 b	0.56 ± 0.05 b
Condensed tannins, MeOH-soluble	6.59 ± 1.19 a	3.88 ± 0.56 a	5.48 ± 0.57 a	1.47 ± 0.38 b	2.16 ± 0.38 b
Condensed tannins, MeOH-insoluble	2.59 ± 0.50 a	1.62 ± 0.21 a	1.63 ± 0.11 a	0.68 ± 0.15 b	0.96 ± 0.11 b
TOTAL	20.30 ± 3.46 a	15.38 ± 1.28 a	20.89 ± 2.15 a	7.12 ± 1.53 b	8.23 ± 1.20 b