Figure 3
(a) TIC trace of the extract obtained from the edge of interest on artefact XXVI-4257, showing the elution of (b) cholesterol-D7 (internal standard) and (c) β-sitosterol within the sterol analogues time segment window (14.0–16.1 min). The positive identification of β-sitosterol was based on the corresponding elution times and MRM quantitative and qualitative ion transitions between (d) the analyte and (e) the β-sitosterol reference standard. Notes: Qt = quantitative ion; Ql = qualitative ion; X-axis = retention (acquisition) time (min); Y-axis = analyte abundance (counts). The unlabelled peaks in the TIC trace (a) are unidentified compounds and were not analytes targeted in this study.
