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Influence of bromide on electrochemistry of photosynthetic reaction center films on gold electrodes.

Z Gao¹, H A Frank, Y M Lvov

¹Department of Chemistry, University of Connecticut, Storrs, 06269-3060, USA.

Bioelectrochemistry (Amsterdam, Netherlands)

|August 17, 2001

Summary

Bromide ions strongly influenced voltammetry of photosynthetic reaction center (RC) protein films. Previous studies may have been skewed by bromide ion adsorption/desorption, affecting observed electrochemical signals.

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Area of Science:

Electrochemistry
Biophysics
Materials Science

Background:

Layered films of photosynthetic reaction center (RC) protein and polyions on gold electrodes are used in electrochemical studies.
Previous electrochemical analyses of these films may have been influenced by experimental conditions.

Purpose of the Study:

To investigate the influence of bromide ions on the voltammetry of RC-polyion films.
To re-evaluate previous findings in light of potential bromide ion interference.

Main Methods:

Cyclic voltammetry (CV) was performed on layered films of RC protein and polyions on gold electrodes.
Experiments were conducted in buffer solutions with and without bromide ions.

Main Results:

Bromide ions significantly influenced the cyclic voltammetry (CV) of RC-polyion films.
Similar, but not identical, CV peaks were observed in the presence of bromide, regardless of RC presence.
RC films exhibited distinct CVs in the absence of bromide, indicating bromide's strong effect.

Conclusions:

Bromide ion adsorption/desorption can cause significant background peaks in the voltammetry of RC-polyion films.
Published results on these systems may be biased due to unacknowledged bromide ion interference.
Careful control of bromide ion concentration is crucial for accurate electrochemical studies of RC films.