b,b-Carotene-3,3'-diol, (3R,3'R)- Singlet oxygen

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

Reaction: b,b-Carotene-3,3'-diol, (3R,3'R)- + ¹O₂^* ® products and/or physical quenching
Solvent: C₆H₆

k = 1.2 × 10¹⁰(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.

Lee, S.-H.; Min, D.B.
J. Agric. Food Chem. 38, 1630-1634 (1990)

Reaction: b,b-Carotene-3,3'-diol, (3R,3'R)- + ¹O₂^* ® products and/or physical quenching
Solvent: CH₂Cl₂

k = 6.8 × 10⁹(L mol^-1 s^-1), T = 293K

Experimental method: Photolysis
Analytical method: oxygen consumption
Data type: Derived from steady state measurements using indicator

Photosensitizer = Chlorophyll a; used solvent k_d = 1.0 × 10⁴ s^-1; Indicator = Soybean oil. [Sensitizer] = 4.4 × 10^-9 (mol L^-1).

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

Reaction: b,b-Carotene-3,3'-diol, (3R,3'R)- + ¹O₂^* ® products and/or physical quenching
Solvent: CHCl₃, 50%, EtOH, 50%

k = 3 × 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 = 1.0 × 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].

Krasnovsky, A.A.,Jr.; Paramonova, L.I.
Biophysics (Engl. Transl.) 28, 769-774 (1983)

Reaction: b,b-Carotene-3,3'-diol, (3R,3'R)- + ¹O₂^* ® products and/or physical quenching
Solvent: CCl₄

k = 7.0 × 10⁹(L mol^-1 s^-1)

Experimental method: Modulated photolysis
Analytical method: infrared luminescence
Data type: Derived from steady state measurements
Excitation wavelength: 652 nm

Photosensitizer = 5,10,15,20-Tetraphenylporphine. used solvent k_d = 36 s^-1.

Krasnovsky, A.A.,Jr.; Paramonova, L.I.
Biophysics (Engl. Transl.) 28, 769-774 (1983)

Reaction: b,b-Carotene-3,3'-diol, (3R,3'R)- + ¹O₂^* ® products
Solvent: CCl₄

k_react = 3.4 × 10⁶(L mol^-1 s^-1)

Experimental method: Photolysis
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements

Photosensitizer = 5,10,15,20-Tetraphenylporphine; Actinometer = Tetracene.

Rodgers, M.A.J.; Bates, A.L.
Photochem. Photobiol. 31, 533-537 (1980)

Reaction: b,b-Carotene-3,3'-diol, (3R,3'R)- + ¹O₂^* ® products and/or physical quenching
Solvent: Benzene

k = 2.8 × 10⁹(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: vis-UV absorption
Data type: Absolute value measured directly using indicator
Excitation wavelength: 337 nm

Photosensitizer = Anthracene.