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Table 1 Concentration of betulin / betulinic acid in the HPLC tested samples

From: Study of the betulin enriched birch bark extracts effects on human carcinoma cells and ear inflammation

Sample

Weighed quantity

Active principle concentration in HPLC tested sample

Total quantity in the sample

% of active substance in sample

 

mg

ng/ml

mg

 
  

Betulinic acid

Betulin

Betulinic acid

Betulin

Betulinic acid

Betulin

1

9.96

393.79

736.12

0.39

7.36

4.0

73.9

2

8.08

296.03

536.09

0.30

5.36

3.7

66.3

3

10.31

204.99

795.77

0.20

7.96

2.0

77.2

1 pp

10.47

256.61

852.12

0.26

8.52

2.5

81.4

3 pp

12.5

181.68

1216.79

0.18

12.17

1.5

97.3

4

8.12

135.90

628.50

0.14

6.28

1.7

77.4