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. 2022 Mar 25;11(4):629. doi: 10.3390/antiox11040629

Figure 1.

Figure 1

HOFE chromatograms and mass spectrum. (A) General HOFE chromatogram in which hydroxytyrosol peak appears at a retention time of 1.23 min. (B) Amplified chromatogram with detail of hydroxytyrosol peak. (C) Negative mass spectrum of HOFE. Hydroxytyrosol has a negative mass of 153.0569.