Figure 2

MS1 spectra and extracted ion chromatograms (EIC) of oligohexosylceramides (OHCs). (a) Average MS1 spectra obtained from HPLC–ESI–QqTOF exhibited a sequence of cations with mass difference close to a dehydrated hexose (C6H10O5, m/z 162.0528). (b) EIC displayed elution times which decreased with increasing m/z value among these ions.