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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > September  >
In the Laboratory
A Laboratory Simulation for Coupled Cycles of Photosynthesis and Respiration
Silke Korn and Michael W. Tausch
Institut für Synthesechemie, Universität Duisburg, D-47057 Duisburg, Germany
Cover
September 2001
Vol. 78 No. 9
p. 1238
Abstract
A laboratory experiment simulating the basic steps of the coupled cycles of photosynthesis and respiration has been developed. It may be applied in several versions depending on the availability of lab equipment and the chemistry education level of the students. This Photo-Blue-Bottle experiment demonstrates the light-driven reduction of a substrate and its reoxidation to release the stored energy. As in the natural processes, a visible-light-absorbing photocatalyst initiates the photoreduction and oxygen from the air is used for reoxidation of the substrate. The cyclic processes are visualized as color changes (yellow-blue-yellow) and as changes of the electrochemical potential.
Supplement
The description of further versions of the Photo-Blue-Bottle experiment, along with instructor notes and student handouts, are available. In addition, there are animated graphics at our Web site, with some extracts available in English.
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*  Citation
 Korn, Silke; Tausch, Michael W. J. Chem. Educ. 2001 78 1238.
*  Keywords
 Catalysis; Demonstrations; Excited States / Energy Transfer; Photochemistry; Redox Reactions; Laboratory Instruction
*  History
 Created:
Last Updated:		 August 14, 2001
August 31, 2005
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