Fig. 2. Identification of nodakenin in SRE and its stability with temperature and time. Commercially available nodakenin was used as a standard. High-performance liquid chromatography (HPLC-PDA) chromatogram of nodakenin in SRE and its chemical structure (upper panel). The retention time of nodakenin was 11.4 min. The contents of nodakenin in SRE were determined depending on storage temperature at 4°C and room temperature up to 12 months by HPLC (lower panel). Values are mean ± SD. SRE, water extract of Radix Saposhnikoviae; RT, room temperature.
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