Supplementary files

Supplementary Materials: Additional file 1: Supplemental Methods Untra high-performance liquid chromatography-mass spectrometry (UHPLC-MS/MS) analysis Additional file 2: Figure S1: Permutation test of OPLS-DA models Figure S2: Correlation between putative biomarkers and clinical indicators. Additional file 3: Table S1: 83 lipids discriminating CAP from controls Table S2 83 lipids discriminating SCAP from NSCAP Additional file 4: Figure S1 Representative chemical structures and fragmentation of PC in positive mode and negative mode. Figure S2. Determination of chemical structures of PC(16:0_18:1) in serum extract by tandem mass spectrometry. Figure S3. Determination of chemical structures of PC (18:2_20:4) in serum extract by tandem mass spectrometry. Figure S4. Determination of chemical structures of PC (36:4) in serum extract by tandem mass spectrometry. Figure S5. Determination of chemical structures of PC (38:6) in serum extract by tandem mass spectrometry