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Matrix effect profiles (MEPs) of undiluted lemon extract (a (IC) and b (LC-HILIC), yellow) and undiluted soybean extract (c (IC) and d (LC-HILIC), yellow) along with the corresponding fivefold dilutions (a, c (IC), pale blue) overlaid by IC conductivity chromatograms (a, c purple) and LC-MS/MS TICs (b, d purple); all extracts in LC-MS/MS were undiluted. TIC, total ion chromatogram
