Figure 3
From: Earliest tea as evidence for one branch of the Silk Road across the Tibetan Plateau
Extracted ion chromatograms and exact mass spectra for theanine from SRM theanine and archeological samples.
(a) Ion chromatogram of SRM theanine at a 1.54 min retention time. (b) Exact mass spectra at m/z 175.1082 ([M + H] + ) for SRM theanine [γ-glutamylethylamide]. (c) Extracted ion chromatogram of Sample DK15-1, uniform with SRM theanine. (d) Exact mass spectra of theanine for Sample DK15-1. (e) Extracted ion chromatogram of Sample XZ-1, indicating theanine. (f) Exact mass spectrometry of theanine for Sample XZ-1.
