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Total ion chromatogram of hot-water extract of Capsella bursa-pastoris (CBW) obtained by ultra-performance liquid chromatography (UPLC) triple quadrupole mass spectrometry (UPLC-TQ-MS). Twenty micrograms of CBW were injected into the UPLC system followed by TQ-MS analysis, and a total ion chromatogram was acquired over a period of 21 min. The internal standard (IS), 13C3-catechin, was used with a retention time of 3.8 min.
