A Versatile and Sensitive Method for Measuring Oxygen
Oxygen dependence of the lifetime of the excited triplet state of phosphorescent molecules can be used to measure the oxygen concentration in aqueous media. These measurements are insensitive to much of the optical interference that limits the usefulness of measurements based on the oxygen dependent quenching of luminescence intensity. The measurements also extend to significantly lower oxygen concentrations than are normally attainable using oxygen electrodes. The phosphorescence lifetimes can be accurately measured from a few microseconds to seconds, permitting a wide dynamic range of oxygen concentration measurements. With currently available probes, for example, it is possible to make continuous measurement of oxygen concentrations from 10−4 M to 10−8 M in a single experiment.
KeywordsOxygen Concentration Luminescence Intensity Light Flash Direct Memory Access Exciting Light
Unable to display preview. Download preview PDF.
- Figulla, H.R., Hoffmann, J. and Lubbers, D.W. (1984). Evaluation of reflection spectra of the isolated heart by multicomponent spectra analysis in comparison to other evaluating methods. In: Oxygen Transport to Tissue-V. Eds Lubbers, D.W., Acker, H., Leniger-Follert, E. and Goldstick, T.K., Plenum Press, New York and London, (Adv. Exp. Med. Biol. 169, 821–830 ).Google Scholar
- Opitz, N. and Lubbers, D.W. (1984). Increased resolution power in P02 analysis at lower PO2 levels via sensitivity enhanced optical P02 sensors (P02 optodes) using fluorescence dyes. In: Oxygen Transport to Tissue-VI. Eds Bruley, D., Bicher, H.I. and Reneau, D., Plenum Press, New York and London, (Adv. Exp. Med. Biol. 180, 261–267 ).Google Scholar
- Silver, I.A. (1984). Polarographic techniques of oxygen measurements. In: Oxygen: An In–depth Study of its Pathophysiology. Eds Gottlieb, S.F., Longmuir, I.S. and Totter, J.R. Undersea Med. Soc. pub No. 62(ws) 3–1–84, Bethesda, MD. pp. 215–238.Google Scholar
- Vanderkooi, J. and Wilson, D.F. (1986). A new method for measuring oxygen concentration in biological systems. In: Oxygen Transport to Tissue-VIII. Ed. Longmuir, I.S., Plenum Press, New York and London, (Adv. Exp. Med. Biol. 200, 189–193 ).Google Scholar
- Wittenberg, B.A. and Wittenberg, J.B. (1985). Oxygen pressure gradients in isolated cardiac myocytes. J. Biol. Chem. 260, 6548–6554.Google Scholar