Sample

CHEMICAL DETAILS SAMPLE ORIGIN SAMPLE PREP./SIZE PYR0L. CONDITIONS TOTAL ION COUNTS

remarks - Comparison with the oven pyrolysis pattern (Spectrum D.12) shows the complete absence of aliphatic hydrocarbon series, apparently as a result of condensation losses. Instead, this spectrum is entirely dominated by the choline-derived fragments at m/z 58, 59 and 71 thought to represent C3HgN+, trimethylamine and dimethyl vinyl amine respectively (see Part I, Section 3.5). The absence of marked peaks at m/z 50, 52 (CH3C1+-) and at m/z 89 (N,N-dimethylethanolamine) often observed in Py-mass spectra of choline-containing phospholipids (see Part I, Figure 9) is probably due to differences in the ionic status of the sample.

L-ct-LECITHIN (dipalmitoyl)

see insert in spectrum; C40H820gNP; MW = 792

Serva, Heidelberg, GFR

solution in methanol; 10 yg standard

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