Beta - carotene and Lycopene

[oldcat157]

Any one know if Beta-carotene and Lycopene could glow under UV light?

 

I think they are both contain conjugated double bonds, if I'm not sure if it's correct ?

 

Thanks !!!

[mississippichem]

Any one know if Beta-carotene and Lycopene could glow under UV light?

 

I think they are both contain conjugated double bonds, if I'm not sure if it's correct ?

 

Thanks !!!

 

Well I couldn't find a true flourescence spectrum of [math]\beta[/math]-carotene, but this UV-vis spectrum shows that there is some absorbance in the near UV. Assuming a typical stokes shift for linear conjugated poly-enes; there should be some fluorescence in the "violet-blue-green" area of the spectrum.

 

UV-vis: beta carotene

 

However I don't know anything about the quantum yield for carotenes, so i don't know if the fluorescence will be intense enough to be visible.