a E/M@FA-LPs contributed to ferroptosis in A549 cell as confirmed by flow cytometry. b The A549 and H1299 cells treated with E/M@FA-LPs showed shrunken mitochondria with increased membrane density. Scale bar represents 5 μm. c E/M@FA-LPs increased intracellular ferrous iron in A549 and H1299 cells. All experiments were repeated at least three times and representative data are shown. Data are means ± SEM; **p < 0.01.