RP-HPLC chromatograms of the oat total glycolipid SPE subfraction 3, enriched in TriGDG and TetraGDG. a) RP-HPLC-ELSD chromatogram, b) positive ESI TIC, m/z 200-2000, c) EIC of m/z 1282.9, a major TetraGDG non-estolide, TetraGDG 36:4 (The probable retention time of authentic TetraGDG 36:4 was identified with an arrow; the identity of the lipids in the multiple peaks at 35-45 min is unknown.), d) EIC of m/z 1120.8, a major TriGDG non-estolide, TriGDG 36:4, e) EIC of m/z 1096.7, a major TriGDG non-estolide, TriGDG 34:2, f) EIC of m/z 1136.7, a major TriGDG non-estolide with a free hydroxyl group, TriGDG 36:4-OH, g) EIC of m/z 1399.1, a major TriGDG mono-estolide, TriGDG 54:6, and h) EIC of m/z 1677.4, a major TriGDG di-estolide, TriGDG 72:8.