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Bauer, N.A. ; Hoque, E. ; Wolf, M. ; Kleigrewe, K.* ; Hofmann, T.*

Detection of the formyl radical by EPR spin-trapping and mass spectrometry.

Free Radical Biol. Med. 116, 129-133 (2018)

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For the first time we here present the unambiguous identification of the formyl radical ((CHO)-C-center dot) by EPR (Electron Paramagnetic Resonance) spectroscopy and mass spectrometry (MS) using DMPO (5,5-dimethyl-1-pyrroline N-oxide) as spin trap at ambient temperature without using any catalyst(s). The (CHO)-C-center dot was continuously generated by UV photolysis in closed anoxic environment from pure formaldehyde (HCHO) in aqueous solution. The isotropic hyperfine structure constants of (CHO)-C-center dot were determined as a(N)= 15.72 G and a(H) = 21.27 G. The signals were deconvoluted and split by simulation in their single adduct components: DMPO-CHO, DMPO-H and DMPO-OH. We verified our results at first using MNP (2-methyl-2-nitroso-propane) as spin trap with known literature data and then mass spectrometry. Similarly the MNP adduct components MNP-CHO, MNP-H as well as its own adduct, the MNP-2-methyl-2-propyl (MNP-MP) were deconvoluted. Due to the low signal intensities, we had to accumulate single measurements for both spin traps. Using MS we got the exact mass of the reduced (CHO)-C-center dot adduct independently confirming the result of EPR detection of formyl radical.

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