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

<div>HPLC chromatograms of the standard solution (a), an extract obtained using HRE (b), and an extract obtained using HSC–CO<sub>2</sub> extraction (c).</div>

Evidence-Based Complementary and Alternative Medicine

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Figure 2

Figure 2: Determination of Oleanolic and Ursolic Acids in <i>Hedyotis diffusa</i> Using Hyphenated Ultrasound-Assisted Supercritical Carbon Dioxide Extraction and Chromatography 

Figure 2 | Determination of Oleanolic and Ursolic Acids in Hedyotis diffusa Using Hyphenated Ultrasound-Assisted Supercritical Carbon Dioxide Extraction and Chromatography 