Abstract:There is a need in many studies on the epidermal permeability barrier for practical and reliable separation of all major fractions of human stratum corneum lipids. Various methods have been described including thin layer chromatography, high performance thin layer chromatography and iatroscan. However, none of these methods seems to be applicable for an inexpensive, rapid and reliable analysis of a large number of samples. Here, such a method for the separation and quantification of all major stratum corneum l… Show more
“…Bonte et al (145) separated stratum corneum lipids by automated multiple development (AMD) on HPTLC silica gel plates using an initial isocratic step followed by a 25-step gradient from methanol-water to hexane. Schuerer et al (146) used densitometric quantification for the separation and analysis of human stratum corneum lipids by sequential one-dimensional TLC with detection by charring. Watanabe and Mizuta (147) detected glycosphingolipids from biological samples by TLC at the 5 pmol level using 5-hydroxy-l-tetralone as fluorescent labeling reagent.…”
“…Bonte et al (145) separated stratum corneum lipids by automated multiple development (AMD) on HPTLC silica gel plates using an initial isocratic step followed by a 25-step gradient from methanol-water to hexane. Schuerer et al (146) used densitometric quantification for the separation and analysis of human stratum corneum lipids by sequential one-dimensional TLC with detection by charring. Watanabe and Mizuta (147) detected glycosphingolipids from biological samples by TLC at the 5 pmol level using 5-hydroxy-l-tetralone as fluorescent labeling reagent.…”
“…Although HPTLC 9 is the most used, other analytical methods have been used, like HPLC, [10][11] GC/MS, 12 FTIR, 13 NMR. Although HPTLC 9 is the most used, other analytical methods have been used, like HPLC, [10][11] GC/MS, 12 FTIR, 13 NMR.…”
Ceramides constitute the major group of lipids in the Stratum Corneum where they play a crucial role in maintaining the water permeability barrier of the mammalian epidermis. Cutaneous ceramides are highly heterogeneous in structure. Consequently commercial standards of all these molecules are not available and no simple analytical system supports this magnitude at this time. Our work suggests a strategy, which offers the possibility of having the first simple tool for ceramide structural identification in the absence of a ceramide standard. The ceramide separation is done in NARP (non-aqueous reverse phase) liquid chromatography and the ceramide structural identification in GC/MS (gas chromatography / mass spectrometry). The correlation between these two methods establishes the retention behaviour of ceramides. This retention has been shaped into abacuses. Downloaded by [University of Nebraska, Lincoln] at 09:58 03 January 2015 ORDER REPRINTS 380 GAUDIN ET AL.This approach is based on various theories: the linear progression of t' R in a linear gradient, methylene selectivity and the incrementation on homologous series. This approach by modelisation has the advantage of being completed by iterations each time a new structure is available and without having to carry out the optimisation of the system again.
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