Fig. 4
From: Preparation, optimization and in vitro–in vivo evaluation of Shunxin sustained release granules
Typical chromatograms of plasma samples. Chromatograms of blank plasma (a), blank plasma spiked with the analytes and IS (b), a plasma sample after oral administration of Shunxinzufang extract (c) and a plasma sample after oral administration of Shunxin sustained release granules (d). 1, 2, 3 and 4 represent paeoniflorin, calycosin-7-glucoside, ferulic acid and IS, respectively