Figure 2. Ion Chromatograms of the internal standards. Extracted ion chromatograms of the internal standards detected either in the positive (A) or in the negative (B) ion mode. 1: Sphingosine (C17); 2: Sphinganine (C17); 3: 18:1(d7) Lysophosphatidylcholine (Lyso PC); 4: Sphingomyelin (C12); 5: Lactosyl(β) C12 Ceramide; 6: Glucosyl(β) C12 Ceramide; 7: Ceramide (C12); 8: d18:1–18:1(d9) SM; 9: 15:0–18:1(d7) PC; 10: 15:0–18:1(d7) DG; 11: Ceramide (C25); 12: 15:0–18:1(d7) −15:0 TG; 13: 18:1(d7) Chol Ester; 14: 18:1(d9)-26:0 WE; 15: 18:1(d7) Lyso PE; 16: 15:0–18:1(d7) PI (NH4 Salt); 17: 15:0–18:1(d7) PS (Na Salt); 18: 15:0–18:1(d7) PG (Na Salt); 19: 15:0–18:1(d7) PE; and 20: 18:1–16:0 OAHFAs.