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. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: Prog Retin Eye Res. 2011 Dec 22;31(2):121–135. doi: 10.1016/j.preteyeres.2011.12.001

Figure 7.

Figure 7

Photooxidation and photodegradation of all-trans-retinal dimer. Analysis by electrospray ion multi-mode ionization (ESI). Samples of all-trans-retinal were unirradiated (A) or irradiated (B) at 430 nm (hv). The series of peaks from m/z 551–679 reflect photooxidation at carbon-carbon double bonds in all-trans-retinal dimer. Lower mass peaks (< m/z 592) correspond to all-trans-retinal dimer photodegradation products. C. Proposed structures of the largest of the photodegradation products. Upper left, all-trans-retinal dimer exhibits absorbance peaks at 432 nm and 292 nm that can be assigned to long and short arms of the molecule, respectively.