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Microwave Assisted Extraction of betulin from birch outer bark

Ferreira, Rui ; Garcia, Helga ; Sousa, Andreia ; Freire, Carmen ; Silvestre, Armando ; Kunz, Werner ; Rebelo, Luis ; Pereira, Christina


In this communication, we report a new method for the isolation of betulin, a triterpenoid with interesting pharmacol. activities, from birch outer bark. Remarkably high purity betulin raw exts. were obtained, ca. 95 wt%, through microwave assisted extn. with limonene. This saves time and energy when compared to the conventional methods. [on SciFinder(R)]

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