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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Ocul Surf. 2018 Dec 12;17(2):318–326. doi: 10.1016/j.jtos.2018.12.006

Figure 4.

Figure 4.

LC-MS/MS analyses of human meibum conducted in triple quadrupole mode. The species of ceramide (Cer), hexosyl-ceramide (Hex-Cer), and sphingomyelin (SM) were identified based on their retention time and m/z ratio and quantified as described in previous publications.30,31 The mole percent of species of Cer, Hex-Cer, and SM were compared across groups defined by clinical parameters. *Denotes statistical significance with p-value <0.05. Boxplots depicting the median, interquartile range, and range are shown. A. The mole percent of Cer species compared to meibum quality. B. The mole percent of Hex-Cer species compared to meibum quality. C. The mole percent of SM species compared to meibum quality.