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Mass chromatograms of endogenous labeled acetophenone (A) and 1PE (B) in tea leaves supplied with l-[2H8]Phe. [M], [M − CH3], and [M − OCCH3] are characteristic ions of nonlabeled acetophenone, and [M], [M − CH3], and [M − OHCHCH3] are characteristic ions of nonlabeled 1PE in GC-MS analysis. The fragments of labeled acetophenone and 1PE were assigned based on the pattern of nonlabeled acetophenone and 1PE.
