Southwest Georgia Local Section


Carotenoid neutral radicals: a new photoprotective pathway to dissipate excess energy?

Posted on February 17, 2015 at 11:25 AM


The Southwest Georgia Section of the American Chemical Society invites you to attend the first for the year local meeting and seminar entitled:

“Carotenoid neutral radicals: a new photosynthetic pathway of dissipating excess energy?”

by Dr. Alexandrina Ligia Focsan

Assistant Professor of Chemistry

Valdosta State University


to be held on Wednesday, February 25, 2015.

At Georgia Southwestern State University

Marshall Student Center (Faculty Dining Room)

Directions can be downloaded here:,%20GSW%20&%20Campus%20Map.pdf



6:00 pm - Social Period and Dinner ($12 / $5 students)

7:00 pm - Speaker Presentation

7:40 pm - Q&A

RSVP by February 20th to: Dr. Nedialka Iordanov, (229) 931-2334



Carotenoids have crucial roles in photosynthesis. They absorb light to be used in this process and under excessive light they protect chlorophyll from photodamage. When chlorophyll absorbs light, it goes into an excited state and excess energy must be dissipated in the form of heat or fluorescence in order to prevent photochemical reactions detrimental to the plant. A new photoprotective mechanism to dissipate the excess energy from excited chlorophyll involving carotenoid neutral radicals was proposed,[1-3] remaining under further investigation. My research studies in the past 10 years that have revealed the chemistry and properties of carotenoid radicals will be presented.

1. Chemistry of Carotenoid Neutral Radicals A. L. Focsan, A. Magyar, M. Bowman, L. D. Kispert- submitted to Arch. Biochem. Biophys.

2. Structure and properties of 9'-cis neoxanthin carotenoid radicals by electron paramagnetic resonance measurements and density functional theory calculations: present in LHC II? A. L. Focsan, P. Molnár, J. Deli and L. D. Kispert, J. Phys. Chem. B 2009, 113, 6087-6096.

3. Pulsed EPR and DFT characterization of radicals produced by photo-oxidation of zeaxanthin and violaxanthin on silica-alumina, A. L. Focsan, M. K. Bowman, T. A. Konovalova, P. Molnár, J. Deli, D. A. Dixon and L. D. Kispert, J. Phys. Chem. B 2008, 112, 1806-1819.


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