Fig. 3: Radical measurements.
From: Fast autoxidation of unsaturated lipid films on indoor surfaces
a Mechanism of HBA formation from the reaction of BA with •OH radicals. b, c HBA production over time in fresh or pre-irradiated (3.5 h) ML films with added BA under irradiation or in the dark. d HBA production over time in fresh or pre-aged (25 h) ML films with added BA in the dark indoor environment. e HBA production over time in oxidized ML films exposed to O3 ( ~ 160 ppb, 40 h) with added BA in the dark flow reactor without gaseous oxidants. f, g Experimentally observed and simulated EPR spectra of ML films under irradiation (5.3 h) or in the dark indoor environment (45.3 h), including deconvolution of the simulation spectrum and residual spectrum (DMPO-R, aN = ~14.4 G, aβ−H = ~ 22.0 G); DMPO-OR, aN = ~13.3 G, aβ−H = ~ 8.3 G, and aγ−H = ~ 1.6 G). Note that •OH and peroxyl radicals were not included in the simulation due to the challenges associated with DMPO spin trapping27,54,78,79. Source data are provided as a Source Data file.
