Sample

CHEMICAL DETAILS SAMPLE ORIGIN SAMPLE PREP./SIZE PYROL. CONDITIONS TOTAL ION COUNTS

L-a-LECITHIN (dipalmitoyl) C4QH820gNP; MW = 792 Serva, Heidelberg, GFR solution in methanol; 10 yg ferromagnetic tube; Teq 770°C 7 X 105

REMARKS - Compared to tripalmitin (Spectrum D.8), a similar series of alkene molecular ions at m/z 28, 42, etc. is observed, as well as the characteristic fatty acid ester fragment ion at m/z 67. The prominent signals at m/z 58, 59 and 71 represent well-known pyrolysis fragments of the choline moiety (see Part I, Section 3.5, and Spectrum D.12a). Whether the odd-numbered ion signals at m/z 87 and 143 represent N-containing ions or hydrocarbon fragment ions is as yet unknown.

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