Super/subcritical fluid extraction combined with ultrasound-assisted ethanol extraction in propolis development

Propolis has attracted commercial interest as a good source of flavonoids and terpenes. This study applied a two-step sequential extraction process, consisting of a super/subcritical extraction step and an ultrasound-assisted ethanol extraction (UAEE) step to raw propolis. The yields of propolis extracts and the extraction rates of flavonoids and terpenes have been used to evaluate the different extraction methods. The results have indicated...