An HPLC method to determine sennoside A and sennoside B in Sennae fructus and Sennae folium
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chromatography R, water R, phosphoric acid R (200:800:1 V/V/V) as mobile phase. The flow rate was 1.2 mL/min, the column temperature 40°C, the detection wavelength 380 nm, and the injection volume 20 μL. The
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