Laser flash photolysis study on the quenching reaction of the excited triplet state of acenaphthenequinone by antioxidant vitamin C

Photosensitive damage of dipeptides: mechanism and influence of structure

“…S1a), which represent the triplet–triplet absorption (T 1 → T n ) of 3 ACQ*. 27 Its decay dynamic lifetime is up to 2.4 μs, and it is strongly quenched in air (0.97 μs) and oxygen (0.26 μs). 31 …”

“…The representative polycyclic quinone molecule (i.e., ACQ) is created by burning gasoline in cars, and it enters the human body by inhalation. 27 After photoexcitation using UV light or redox interaction with biological enzymes, polycyclic quinone molecules transform to their triplet state that is harmful to human tissues and cells. 30 Thus, ACQ was chosen as the photosensitizer, and its triplet state characteristics were investigated by nanosecond transient absorption spectroscopy.…”

“…26 In recent years, our group has been investigating the dynamic processes and reaction mechanisms of polycyclic and biological quinone molecules with vitamin C, vitamin E, and amino acids. 12,27–29 The photosensitive reaction processes involving excited triplet states of quinones or ketones and free monomer amino acids are well understood after decades of investigation. However, reports on the photosensitive damaging reactions of peptides or dipeptides with multiple reaction sites are not common due to their complexity.…”