Table 1 Yield and concentration of condensed tannins (CT) in water, acetone–water and methanol–water extracts of bark from different tree species, origin and season.

From: Condensed tannins, novel compounds and sources of variation determine the antiparasitic activity of Nordic conifer bark against gastrointestinal nematodes

Bark

Solvent

CT yield per gram dry bark (mg/g bark)

CT concentration in extracts (mg/g extract DM)

Summer

Winter

Summer

Winter

S1

Water

2.7

8.7

70

80

S2

2.5

3.5

17

48

P

1.5

1.8

65

33

S1

Acetone–water

11.0

15.7

107

122

S2

7.8

8.7

91

101

P

5.4

5.3

153

95

S1

Methanol–water

5.2

10.3

98

106

S2

3.6

3.8

68

68

P

3.8

4.2

142

91

  1. Quantification was carried out on bark extracts at the highest concentration tested in the GIN assays (1000 µg extract/mL). Bark extracts include: (S1) spruce, sawmill, ring debarking; (S2): spruce, pulp mill, drum debarking; (P): pine, sawmill, ring debarking. Season bark was collected, summer and winter.
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