PC profile changes during copper-induced oxidation of rabbit LDL. Rabbit LDL (0.1 mg/mL) was incubated with copper sulfate (5 μM) at 37°C for up to 8 h. Lipid extraction and LC-MS/MS analysis were performed as in Figure 2. The peak area (cps) for each species was normalized based on the peak areas of internal standard, and the means and SD were calculated from six independent preparations. The 42 PC and modified PC molecular species by MRM mode, and they were classified into five categories: PUFA-PC (A), S/MUFA-PC (B), lysoPC (C), cleaved-chain oxPC (D) and long-chain oxPC (E). Statistical significance of comparison with the sample without incubation (0 h) was calculated by ANOVA; *, p < 0.05; #, p < 0.01; +, p < 0.005; **, p < 0.001.