Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 75)
Quantitative Fluorescence Photometry with Biological Fluids and Gases
Longmuir and Knopp (1) have shown that the quenching of the fluorescence of pyrene butyric acid by oxygen (2) can be used to monitor oxygen concentration in tissue. However, since the fluorescence signal is also influenced by several other factors, such as
a quantitative evaluation meets with considerable difficulties. The error caused by concentration changes can be cancelled by using special indicators which change their spectra with the reaction. For example, Boldt and Lübbers (3) used ß-methyl umbelliferon as a pH indicator which has different excitation spectra for the dissociated and undissociated forms. The other errors cannot be taken into account without special measurements. The actual, possibly disturbed spectrum of the tissue can be related to the true indicator spectrum, if the indicator in the tissue is changed into its dissociated or undissociated form, e. g. on a deliberate change of the pH.
changes in the indicator concentration,
interaction of this indicator with other substances and
the filter effect of the tissue,
KeywordsExcitation Spectrum Fluorescence Quenching Quartz Window Filter Effect Measuring Medium
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- 3.Boldt, M.: Ein korrigiert messendes Spektrofluorormeter zur Messung an trüben Medien. Dissertation Marburg 1971Google Scholar
- 6.Lübbers, D. W.: In: Oxygen Transport to Tissue. Instrumentation, Methods and Physiology, eds. H. I. Bicher and D. F. Bruley, Plenum Publ. Corp. New York 1973Google Scholar
© Plenum Press, New York 1976