a-type ion
In mass spectrometry, an N-terminal fragment of a polypeptide produced by cleavage of the bond between an α-carbon and its neighbouring α-carboxy carbon. A b-type ion is an α-N-terminal acylium ion which results from cleavage of an amide bond, and y-type ions are C-terminal iminium ions from such a cleavage. (see also mass spectrometry (MS))
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