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Physicochemical characteristics of the dry birch bark extract used [9].
| 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 |
