Evidence-Based Complementary and Alternative Medicine / 2015 / Article / Fig 1

Research Article

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

Figure 1

Schematic diagram of the HSC–CO2 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.

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