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Table 1 PCA results for urine aliquots spiked or not with pseudo-markers peptides at increasing concentrations

From: A new strategy for faster urinary biomarkers identification by Nano-LC-MALDI-TOF/TOF mass spectrometry

Pseudo-markers Concentration (fmol/μl) PC1 PC2 PC3 m/z Rank
Low level      
PC (%)   33.8 17.7 14.8 -
1672.83 20 0.31 0.22 0.04 4
1046.46 30 0.31 0.21 0.08 2
2465.08 25 0.27 0.20 0.05 9
Medium level      
PC (%)   31.1 26.0 15.7 -
1672.83 40 0.19 0.15 0.24 2
1046.46 60 0.13 0.13 0.30 3
2465.08 50 0.24 0.15 0.15 4
High level      
PC (%)   38.6 18.3 10.3 -
1672.83 80 0.14 0.19 0.24 1
1046.46 120 0.15 0.20 0.14 2
2465.08 100 0.10 0.16 0.07 3
  1. The rank of each standard peptide in the complete dataset is given according to the sum of their loading absolute values in the 3 retained PCs