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2 Cellular and Molecular Biology Letters

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Unique spectroscopic properties of synthetic 15-cis beta-carotene important in photosynthesis and medicine for photoprotective function

100%

Bialek-Bylka G. E. , Hala J. , Jazurek B. , Skrzypczak A.

Cellular and Molecular Biology Letters

2002

tom 07

nr Suppl.

Unique spectroscopic properties of synthetic 15-cis beta-carotene, an important compound in photosynthesis, and a medicine for photoprotective function

75%

Bialek-Bylka G. E. , Jazurek B. , Dedic R. , Hala J. , Skrzypczak A.

Cellular and Molecular Biology Letters

2003

tom 08

nr 3

The (11Bu+) energy of synthetic 15-cis β-carotene exhibits a linear dependence on (n2-1)/(n2+2) in non-polar and polar solvents; in this it is similar to (that of) all-trans β-carotene. The point of intersection is at (n2-1)/(n2+2) = 0.3 for both isomers. The microenvironment of 15-cis β-carotene in the Photosystem II reaction center was established as having a mean refractive index 1.473. Persistent spectral hole burning with a very broad (≈30 nm) hole observed around 500 nm (corresponding to an extremely short excited lifetime τ ≈9 fs) indicates that 15-cis β-carotene has/displays very efficient photoprotective quenching.