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Reduction of POBN-radical adducts (ESR-active) to form the corresponding hydroxylamines (ESR-silent, but MS-active). Hydroxylamines are a much more stable redox form of radical adducts compared to POBN adducts in radical form (ESR-active). The dual spin-trapping technique allowed us to readily single out hydroxylamines as ion pairs, each with a 9-Da difference in LC/MS [32].
