Recovery of betulinic acid from plane tree (Platanus acerifolia L.)

- Comparison of extraction methods to recover betulinic acid from plane bark.
- UAE using green solvents produce extracts with 30-45% betulinic acid.
- Ethanol as CO2 cosolvent is essential to attain high yield in SFE.
- Up to 18% betulinic acid was obtained in SFE extracts.