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Physical–chemical characteristics of the birch bark dry extract (TE) used [8].
| TE Composition | Specific Surface Area | Particle Size D50% |
|---|---|---|
| Betulin 81.60%, lupeol 2.08%, betulinic acid 3.84%, erythrodiol 1.05%, oleanolic acid 0.97%, betulinic acid methyl ester 0.52%, unidentified substances 9.94% | 42 ± 0.4 m2/g | 5.8 µm |
