Patent ID: 7485852

Claim:
A mass analysis method for analyzing components of a sample by ionizing and mass-analyzing the sample: obtaining a mass spectrum by ionizing a standard sample, selecting an ion from the obtained mass spectrum as a first precursor ion, and obtaining a mass spectrum of the first precursor ion; obtaining a mass spectrum by ionizing a sample of interest to be measured, selecting an ion from the obtained mass spectrum as a second precursor ion with exclusion of an ion common to the first precursor ion, and obtaining a mass spectrum of the second precursor ion; selecting: a mass spectrum of an ion, in the first precursor ion, common to the ion of mass spectrum of the sample of interest to be measured; a mass spectrum of an ion, in the first precursor ion, different to the ion of mass spectrum of the sample of interest to be measured; and a mass spectrum of the second precursor ion; and comparing the selected mass spectra with each other, thereby analyzing the component of the sample of interest to be measured.