Determining the Levels of Four Phenylethanoid Glycosides and Five Triterpene Acids in Liuwei Dihuang Capsule Using Solid Phase Extraction with HPLC-UV

<div>HPLC-UV chromatogram of (a) five triterpene acids mixed standards, (b) LDC solution B, (c) herbal <i>Poria cocos</i> test solution, (d) negative sample solution B with gradient program B, (1) 3-O-acetyl 16<i>α</i>-hydroxytrametenolic acid, (2) dehydropachymic acid, (3) pachymic acid, (4) trametenolic acid, and (5) dehydrotrametenolic acid.</div>

Journal of Analytical Methods in Chemistry

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Figure 3: Determining the Levels of Four Phenylethanoid Glycosides and Five Triterpene Acids in Liuwei Dihuang Capsule Using Solid Phase Extraction with HPLC-UV 

Figure 3 | Determining the Levels of Four Phenylethanoid Glycosides and Five Triterpene Acids in Liuwei Dihuang Capsule Using Solid Phase Extraction with HPLC-UV 