Structure and correspondent nomenclatures of human epidermal ceramides.
|Fatty acid moiety|
|Non-hydroxyl fatty acid (N)||Alpha-hydroxyl fatty acid (A)||Omega-hydroxyl fatty acid (O)||Esterified omega-hydroxyl fatty acid (EO)|
|Sphingoid base moeity||Dihydrosphyngosine (dS)||Cer[NdS]||Cer[AdS]||Cer[OdS]||Cer[EOdS]|
Note: Epidermal ceramides (Cer) are classified into 19 classes depending on their sphingoid base and fatty acid moieties. Ceramide species are additionally defined by fatty acid chain length. Fatty acids [N] and [A] contain C16-C30 whereas fatty acids [O] and [EO] contain C28-36. Ceramides can be glycosylated (not represented) and Cer[OS] can be covalently bound to cornified envelope protein shell. Omega-hydroxy-ceramide include: Cer[Ods], Cer[OS], Cer[OP], Cer[OH]; omega-O-acylceramide include: Cer[EOds], Cer[EOS], Cer[EOP], Cer[EOH]. Ceramide name in square brackets correspond to the Motta nomenclature (Motta et al., 1993).
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