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(A) Chemical structures of solamargine and solasonine. (B) Chromatographic profile of Solanum lycocarpum fruit alkaloidal extract as determined by HPLC-UV. The mobile phase was composed of acetonitrile and sodium phosphate buffer (pH 7.2; 0.01 M) in a ratio of 36.5:63.5 (vol/vol) at a flow rate of 1 ml/min with detection at 200 nm. IS, veratraldehyde; 1, solasonine; 2, solamargine. Data are expressed as milli-absorbance units (mAU) on the y axis and time (minutes) on the x axis.
