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LC-MS/MS chromatogram of EGCG showing the most specific and sensitive MS/MS transition m/z 457→169: (a) plasma sample from a volunteer at baseline, (b) blank of plasma spiked with 428 ng/mL of EGCG, and (c) plasma sample from a volunteer at 60 min after Teavigo® ingestion (calculated concentration: 289 ng/mL). LC-MS/MS = liquid chromatography tandem mass spectrometry.
