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In this study, evidence is provided on the formation of electronically excited species in human multiple myeloma cells U266 in the growth medium exposed to hydrogen peroxide (H 2 O 2 ). Two-dimensional imaging of ultra-weak photon emission using highly sensitive charge coupled device camera revealed that the addition of H 2 O 2  to cell suspension caused the formation of triplet excited carbonyls  3 (R = O)*. The kinetics of  3 (R = O)* formation in the real time, as measured by one-dimensional ultra-weak photon emission using low-noise photomultiplier, showed immediate enhancement followed by a slow decay. In parallel to the formation of  3 (R = O)*, the formation of singlet oxygen ( 1 O 2 ) in U266 cells caused by the addition of H 2 O 2  was visualized by the imaging of  1 O 2  using the green fluorescence of singlet oxygen sensor green detected by confocal laser scanning microscopy. Additionally, the formation of  1 O 2  after the addition of H 2 O 2  to cell suspension was detected by electron paramagnetic resonance spin-trapping spectroscopy using 2,2,6,6-tetramethyl-4-piperidone. Presented results indicate that the addition of H 2 O 2  to cell suspension results in the formation of  3 (R = O)* and  1 O 2  in U266 cell suspension. The contribution of the cell-free medium to the formation of electronically excited species was discussed.

The formation of electronically excited species in the human multiple myeloma cell suspension