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. 2022 May 5;13:2474. doi: 10.1038/s41467-022-30095-z

Fig. 1. The structures and the electronic absorption spectra of β-carotene and its oxygenation products, and their breakdown in the dark.

Fig. 1

a The structural formulae and electronic absorption spectra of β-carotene and β-carotene endoperoxides recorded in acetone at room temperature. b The spectral changes and kinetics (inset) of βCar-7,10-EPO breakdown in dimethyl sulfoxide (DMSO) in the presence of 5,5-dimethyl-1-pyrroline N-oxide (DMPO) as spin trap, in the dark at room temperature, monitored by electronic absorption spectroscopy. Note a 5-fold increase in the reaction rate caused by the addition of DMPO at 150 mM. c, d The breakdown of βCar-5,8-EPO (c) and βCar-7,10-EPO (d) kept in methanol in the dark and monitored by electronic absorption spectroscopy and HPLC with in-line absorption detection (insets). The arrows indicate the absorption spectra of the respective fractions. Source data are provided as a Source Data file.