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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