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Figure 2


Fig. 2. Electrospray ionisation mass spectra showing molecular species composition of P. apeterus thoracic muscle tissue. Positive full mass spectra of (A) glycerophosphoethanolamine (GPEtn) and (B) glycerophosphocholine (GPChol) fractions are depicted separately. Identities of all major [M+H]+ molecular ions (solid ovals) were verified by MS2 and MS3 fragmentations and are shown in Fig. 3. Note that each major ion occurs as a pair of masses differing by 1 amu (13C isotopic contribution). All species formed the adducts with sodium [M+Na]+ in relatively low and constant proportions (broken ovals).





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