Keywords: BMP; bis(monoacylglycero)phosphate; Cer; ceramide; DHC; dihexosylceramide; GD; Gaucher disease; GC; glucosylceramide; LC/ESI-MS/MS; liquid chromatography/electrospray-ionization tandem mass spectrometry; MBS; MES buffered saline; PC; phosphatidylcholine;