AR-extraction methods by Ross et al. (2003) and Geerkens et al.
(2015) were based on stirring-bar agitation and ultrasoundassisted
extraction, respectively, using ethyl acetate as the
extraction solvent. High levels of heneicosylresorcinol were
determined by both methods (ca. 270 mg/g DM), although being
insignificantly higher than those of our simultaneous method(260 mg/g DM).