THE ABSOLUTE VALUE OF THE REACTION RATE CONSTANT OF BILIRUBIN WITH SINGLET OXYGEN IN D2O |
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| Authors: | I B C Matheson |
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| Institution: | Department of Biochemistry, University of Georgia, Athens, GA 30602, U.S.A. |
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| Abstract: | Abstract— The chemical reaction rate constant of bilirubin with singlet oxygen in basic aqueous solution has been redetermined to be 3.5 × 108 M-1 s-1 by a competitive technique using a 1,3-diphenylisobenzofuran in sodium dodecyl sulfate micelles. Bilirubin also physically quenches a singlet oxygen with a rate constant of 9 × 108 M -1 s-1. The lifetime of singlet oxygen in D2O solution has been determined to be 35 μ s . The absorption cross-section for the molecular oxygen 3∑g-→1δ g + 1 v electronic transition at 1.06μn in aqueous solution is unexpectedly larger than the gas paase cross-section. |
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