
Comparisons between conventional, ultrasound-assisted and microwave-assisted methods for extraction of anthraquinones from Heterophyllaea pustulata Hook f. (Rubiaceae)
Keywords: AQs, anthraquinones; UAE, Ultrasound-assisted extraction; MAE, Emicrowave-assisted extraction; O2-, superoxide anion; 1O21O2, singlet molecular oxygen; HPLC, High-performance liquid chromatography; tR, retention times; AUP, area under each peakAnthraquino