Abstract
The stratum corneum (SC) requires ceramides, cholesterol, and fatty acids to provide the cutaneous permeability barrier. SC lipids can be analyzed by normal-phase high-performance thin-layer chromatography (HPTLC). However, without further analysis, some uncertainty remains about the molecular composition of lipids represented by every TLC band of an unknown sample. We therefore analyzed each ceramide band further by subjecting the isolated lipids to a direct coupling of reversed-phase high-performance liquid chromatography and electrospray ionization-mass spectrometry (HPLC/ESI-MS, or IC/MS). IC/MS analysis and ESI-MS/MS negative ion and collision-induced dissociation experiments revealed that ceramide band 4 contained not only N-(ω-OH-acyl)acyl-6-OH-sphingosine, Cer(EOH), but also N-(α-OH-acyl)-sphingosine. Band 5 exclusively contained N-acyl-6-OH-sphingosine. Our results demonstrate the benefit of LC/MS analysis for selective identification of human SC ceramides. Moreover, the combination of HPTLC for pre-separation and LC/MS for identification of lipids is an even more powerful tool for detailed ceramide analysis.
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Abbreviations
- Cer(AP):
-
N-(α-OH-acyl)-4-OH-sphinganine
- Cer(AS):
-
N-(α-OH-acyl)-sphingosine
- Cer(EOH):
-
N-(ω-OH-acyl)acyl-6-OH-sphingosine
- Cer(EOP):
-
an ω-esterified ceramide containing phytosphingosine as a sphingosine backbone and an ω-esterified linoleic acid
- Cer(EOS):
-
N-(ω-OH-acyl)acyl-sphinganine
- Cer(NH):
-
N-acyl-6-OH-sphingosine
- Cer(NP):
-
N-acyl-4-OH-sphinganine
- Cer(NS):
-
N-acyl-sphingosine
- CID:
-
collision-induced dissociation
- ELSD:
-
evaporative light-scattering detection
- ESI-MS:
-
electrospray ionization—mass spectrometry
- HPLC:
-
high-performance liquid chromatography
- HPTLC:
-
high-performance thin-layer chromatography
- LC-MS:
-
liquid chromatography-mass spectrometry
- MS:
-
mass spectrometry
- MS/MS:
-
mass spectrometric fragmentation of specific ions
- NMR:
-
nuclear magnetic resonance
- RP:
-
reversed-phase
- SC:
-
stratum corneum
- TLC:
-
thin-layer chromatography
- UV:
-
ultraviolet
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Vietzke, JP., Brandt, O., Abeck, D. et al. Comparative investigation of human stratum corneum ceramides. Lipids 36, 299–304 (2001). https://doi.org/10.1007/s11745-001-0721-9
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DOI: https://doi.org/10.1007/s11745-001-0721-9