Determination of Oleanolic and Ursolic Acids in <i>Hedyotis diffusa</i> Using Hyphenated Ultrasound-Assisted Supercritical Carbon Dioxide Extraction and Chromatography

<div>Schematic diagram of the HSC–CO<sub>2</sub> extraction apparatus. V1, V2, V3, and V4: stopping valve (on-off valve); HPA, HPB: syringe pump; M: mixer; CB: circulation bath; CH: circulating heater; MV1, MV2: micrometering valve; HC: heating coil; E: extraction vessel; PG: pressure gauge; BR: backpressure regulator; FF: float flowmeter T: thermocouple; and TM: mercury-in-glass thermometer.</div>

Evidence-Based Complementary and Alternative Medicine

fig1

Figure 1

Figure 1: Determination of Oleanolic and Ursolic Acids in <i>Hedyotis diffusa</i> Using Hyphenated Ultrasound-Assisted Supercritical Carbon Dioxide Extraction and Chromatography 

Figure 1 | Determination of Oleanolic and Ursolic Acids in Hedyotis diffusa Using Hyphenated Ultrasound-Assisted Supercritical Carbon Dioxide Extraction and Chromatography 