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Subcritical extraction of birch bark pentacyclic triterpenes


Natural pentacyclic triterpenes were extracted from birch bark with subcritical solvents. The influence of the solvent nature, temperature, and the number of extraction cycles on the efficiency of the process was studied. Using methanol at 100 °С provides the highest tri-terpene extraction rate. Bark extracts prepared using various solvents were analyzed for chemical composition and antioxidant activity.

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Correspondence to D. S. Kosyakov.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 0875—0881, May, 2017.

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Falev, D.I., Kosyakov, D.S., Ul´yanovskii, N.V. et al. Subcritical extraction of birch bark pentacyclic triterpenes. Russ Chem Bull 66, 875–881 (2017).

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  • subcritical extraction
  • pressurized liquid extraction
  • birch bark
  • pentacyclic triterpenes
  • extractive compounds