Abstract: An ion analyzer includes a reaction chamber into which precursor ions derived from a sample component are introduced, a radical irradiation unit that generates and emits a predetermined type of radicals, a standard substance supply unit that individually supplies kinds of standard substances to the reaction chamber, where activation energy of radical addition reaction is known for each of the kinds of standard substances, and the activation energies are different in magnitude, an ion measurement unit that measures an amount of predetermined product ions generated from precursor ions derived from the standard substance by irradiation with the radicals, and a radical temperature calculation unit that obtains an amount of radicals that caused the radical addition reaction from the amount of the predetermined product ions and obtains a radical temperature based on a relationship between the amount of the radicals obtained for each kind of standard substance and activation energy.

Abstract: An ion analyzer for analyzing product ions generated by irradiating precursor ions derived from a sample component with radicals, the ion analyzer including a reaction chamber 2, a radical supply unit 5, 6 configured to generate radicals and supply the radicals to the reaction chamber, a radical temperature acquisition unit 911, 912 configured to acquire a temperature of the radicals to be supplied to the reaction chamber, a standard substance supply unit 11 configured to supply a predetermined amount of predetermined precursor ions to the reaction chamber, the predetermined precursor ions being generated from a standard substance whose activation energy of a reaction in which the radicals attach to the standard substance is known, an ion measurement unit 92 configured to measure an amount of predetermined product ions generated from the precursor ions derived from the standard substance by the reaction with the radicals, a reactive radical amount calculation unit 93 configured to obtain an amount of reactive

Abstract: In a method for analyzing isoaspartic acid by dissociating precursor ions derived from a sample component and generating and analyzing product ions, the method includes: generating product ions by irradiating the precursor ions with hydrogen radicals or radicals having oxidizing ability to dissociate the precursor ions; separating and detecting the product ions according to a mass-to-charge ratio; and specifying product ions derived from isoaspartic acid based on a mass-to-charge ratio of the product ions.

Abstract: An ion analyzer includes a reaction chamber into which precursor ions derived from a sample component are introduced, a radical irradiation unit that generates and emits a predetermined type of radicals, a standard substance supply unit that individually supplies kinds of standard substances to the reaction chamber, where activation energy of radical addition reaction is known for each of the kinds of standard substances, and the activation energies are different in magnitude, an ion measurement unit that measures an amount of predetermined product ions generated from precursor ions derived from the standard substance by irradiation with the radicals, and a radical temperature calculation unit that obtains an amount of radicals that caused the radical addition reaction from the amount of the predetermined product ions and obtains a radical temperature based on a relationship between the amount of the radicals obtained for each kind of standard substance and activation energy.