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. 2019 Mar 14;8(3):99. doi: 10.3390/foods8030099

Figure 1.

Figure 1

(a) HPLC-FL and (b) HPLC-MS chromatograms of tryptophan (TRP) (1 mg/L), tryptophan ethyl ester (TEE) (50 μg/L), and melatonin (MEL) (50 μg/L) in standard synthetic wine solution.