Sphingoid bases fragmentation patterns

Cer species can also be ionized as lithium adducts (i.e., [M+Li]" ) in modest sensitivity in the positive-ion mode if lithium ions are present in the matrix [4], The fragmentation pattern of lithiated Cer species ([M-l-Li]+) has been well characterized [4], which is possibly used to identify the FA amide substituent and the sphingoid bases of the species [4], Fragment ions specific to each Cer subclass are also observed [4], Structural information can also be obtained from characterization of the sodium/potassium adducts of Cer species [5-7],... 

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