Patent ID: 7626162

Claim:
A mass spectrometry system, comprising: a separation unit for separating a liquid mixture of multiple samples containing specific amino acids labeled with multiple stable isotopes having masses different from each other; an ionization unit for ionizing the samples separated by the separation unit; a mass spectrometry unit for performing first mass spectrometry on ions produced by the ionization in the ionization unit, and for performing second mass spectrometry to dissociate specific ions as precursor ions; an amino acid sequencing unit for storing mass information of the amino acid labeled with the multiple stable isotopes, and for analyzing an amino acid sequence of the precursor ion dissociated through the second mass spectrometry by using information on secondary fragment ions obtained through the second mass spectrometry; an information processing unit for processing a result of an analysis performed by the mass spectrometry unit, and for determining whether or not the second fragment ions include a specific fragment ion containing the specific amino acid on the basis of a result of an analysis performed by the amino acid sequencing unit; and a storage unit for creating and storing non-target ion information for use in second mass spectrometry when the information processing unit determines that the specific fragment ion is included, wherein when the information processing unit determines that the specific fragment ion is included and if the specific fragment ion contains a specific amino acid labeled with a heavier one of the multiple stable isotopes, the storage unit creates and stores the second mass spectrometry non-target ion information for an ion containing a specific amino acid labeled with a lighter stable isotope and having a peak adjacent to a peak of the heavier specific ion, and when the information processing unit determines that the specific fragment ion is included and if the specific fragment ion contains a specific amino acid labeled with a lighter one of the multiple stable isotopes, the storage unit creates and stores the second mass spectrometry non-target ion information for an ion containing a specific amino acid labeled with a heavier stable isotope and having a peak adjacent to a peak of the lighter specific ion.