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Table 2 Extraction of active principles from the birch bark

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

Mass of birch bark (Source) Extraction solvent Aspect of extract Resulting samples
15 g (A) 2-Propanol (400 mL) Cream-colored solution + white crystals deposited at the bottom of the flask The white crystals: sample 1 pp
    Evaporation of solution and filtration: sample 1
15 g (A) Ethanol (96% v/v) (400 mL) Cream-colored solution Evaporation of solution and filtration: sample 2
15 g (B) 2-Propanol (400 mL) Cream-colored solution + white crystals The white crystals: sample 3 pp
    Evaporation of solution and filtration: sample 3
15 g (B) Ethanol (96% v/v) (400 mL) Cream-colored solution Evaporation of solution and filtration: sample 4
  1. *Source A: birch bark collected in April 2010 from Ponoarele, Mehedinţi, Romania.
  2. *Source B: birch bark collected in April 2010 from Aninei Mountains, Romania.