Fig. 1From: Identification of compounds using HPLC-QTOF-MS online antioxidant activity mapping from aerial parts of Ligularia stenocephalaLC-QTOF-MS coupled with DPPH assay of EtOAc fraction from L. stenocephala. MS chromatogram (negative ionization mode); DPPH free radical-scavenging activity of each 30 s and applied directly to DPPH assay. Active components exhibited at the peak around 16–18 minBack to article page