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Biophysical Journal 54: 545-549 (1988)
© 1988 the Biophysical Society

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Picosecond transient absorption study of photodissociated carboxy hemoglobin and myoglobin.

S M Janes, G A Dalickas, W A Eaton and R M Hochstrasser

Department of Chemistry, University of Pennsylvania, Philadelphia 19104-6323.

ABSTRACT

The optical transient absorption spectra at 30 ps and 6.5 ns after photolysis are compared for both carboxy hemoglobin (HbCO) and carboxy myoglobin (MbCO). Both 355- and 532-nm excitation pulses were used. In all cases the shapes of the optical difference spectra thus generated are stationary over the complete time-scale studied. The photolysis spectra for MbCO are not significantly different from the equilibrium difference spectra generated on the same picosecond spectrometer when measured to an accuracy of +/- 0.5 nm. In addition, spectral parameters for delegated HbCO generated on the same spectrometer but detected by two different techniques, either by a Vidicon detector or point by point with photomultiplier tubes, are reported; the results are different from some of the previously reported picosecond experiments.




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Copyright © 1988 by the Biophysical Society.