a-Carotene Singlet oxygen

Conn, P.F.; Schalch, W.; Truscott, T.G.
J. Photochem. Photobiol., B 11, 41-47 (1991)

Reaction: a-Carotene + ¹O₂^* ® products and/or physical quenching
Solvent: C₆H₅CH₃

k = 8.2 × 10⁹(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly
Excitation wavelength: 346 or 355 nm

Photosensitizer = Phenazine.

Di Mascio, P.; Kaiser, S.; Sies, H.
Arch. Biochem. Biophys. 274, 532-538 (1989)

Reaction: a-Carotene + ¹O₂^* ® products and/or physical quenching
Solvent: CHCl₃, 50%, EtOH, 50%

k = 6 × 10⁹(L mol^-1 s^-1), T = 310K

Experimental method: Chemical reaction
Analytical method: infrared luminescence
Data type: Derived from steady state measurements

¹O₂* from NDPO₂; reported k = 1.9 × 10¹⁰ L mol^-1 s^-1 using k_d = 1 × 10⁵ s^-1, recalcd. using k_d = 3.0 × 10⁴ s^-1 [92DIM/SUN]; see also [90DIM/DEV].