Figure 5. Confirmation of some major abundant lipid classes by LIFT-TOF/TOF analysis.

MS/MS spectra were acquired using positive ionization mode. (A) [M + H]⁺ of SM16:0. (B) [M + H]⁺ of SM22:0. (C) [M + H]⁺ of SM24:0. (D) [M + H]⁺ of PC34:1. (E) [M + Na]⁺ of PI32:2.