Abstract:
:In plants, algae, and cyanobacteria, photosystem 2 (PS2) catalyzes the light driven oxidation of water. The main products of this reaction are protons and molecular oxygen. In vitro, however, it was demonstrated that reactive oxygen species like hydrogen peroxide are obtained as partially reduced side products. The transition from oxygen to hydrogen peroxide evolution might be induced by light triggered degradation of PS2's active center. Herein, the authors propose an analytical approach to investigate light induced bioelectrocatalytic processes such as PS2 catalyzed water splitting. By combining chronoamperometry and fluorescence microscopy, the authors can simultaneously monitor the photocurrent and the hydrogen peroxide evolution of light activated, solvent exposed PS2 complexes, which have been immobilized on a functionalized gold electrode. The authors show that under limited electron mediation PS2 displays a lower photostability that correlates with an enhanced H2O2 generation as a side product of the light induced water oxidation.
journal_name
Biointerphasesjournal_title
Biointerphasesauthors
Vöpel T,Ning Saw E,Hartmann V,Williams R,Müller F,Schuhmann W,Plumeré N,Nowaczyk M,Ebbinghaus S,Rögner Mdoi
10.1116/1.4938090subject
Has Abstractpub_date
2015-03-22 00:00:00pages
019001issue
1eissn
1934-8630issn
1559-4106journal_volume
11pub_type
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