Additional file 1.

Figure S1. The representative chromatogram of high-performance liquid chromatography for Rg1. Agilent 1100 HPLC system was used and the detection wavelength was set at 280 nm. The mobile phase consisted of (A) acetonitrile and (B) 0.05% aqueous trifluoroacetic acid (V/V), using a gradient elution of 2%-10% A at 0–7 min, 10%–30% A at 7–20 min, 23%–27% A at 20–35 min, and 27%–60% A at 35–50 min .

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Chen et al. BMC Complementary and Alternative Medicine 2012 12:53   doi:10.1186/1472-6882-12-53