Table 1. Total concentrations of the identified tear fluid lipid classes.
class | S1 (µM) | S2 (µM) | mean (µM) | STD (µM) |
PC | 13.8 | 28.0 | 20.9 | 10.1 |
PE | 5.3 | 5.2 | 5.2 | 0.1 |
TG | 1.7 | 1.3 | 1.5 | 0.3 |
Cer | 1.1 | 0.8 | 0.9 | 0.2 |
SM | 0.9 | 0.9 | 0.9 | 0.1 |
PS | 0.1 | 0.1 | 0.1 | 0.0 |
TOTAL | 22.9 | 36.3 | 29.6 | 9.5 |
The concentrations are based on the UPLC-MS data obtained from the analysis of samples S1 and S2. Cer, Ceramide; PC, phosphatidylcholine; PE, phosphatidylethanolamine; PS, phosphatidyl-serine; SM, sphingomyelin; TG, triglyceride; TOTAL, total lipid concentration.