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• W2055280411 abstract "Abstract Raman spectra are reported for oxygenated and deoxygenated haemoglobin contained within a single red blood cell in vivo using excitation wavelengths of 488, 514, 568 and 632.8 nm. The peak assigned in previous work to ν 4 is observed at 1376 cm −1 in oxygenated cells and 1356 cm −1 in deoxygenated cells with the results from 488 nm excitation consistent with earlier Raman studies on isolated haem proteins. Exciting the cells with 514 nm radiation revealed two bands appearing in this region at 1372 and 1356 cm −1 in the oxygenated state, whereas in the deoxygenated state only one band at 1356 cm −1 is observed. At 632.8 nm excitation bands in the ν 4 region appeared at 1367 and 1365 cm −1 in the oxygenated and deoxygenated states, respectively. Our results clearly show that the enhancement of bands in the vicinity of ν 4 within single erythrocytes is influenced by the excitation wavelength. Furthermore, many other bands observed in oxygenated erythrocytes using 632.8 nm excitation were dramatically enhanced compared with the bands observed with other excitation wavelengths. Ruling out other explanations, it is hypothesized that the enhancement observed at 632.8 nm results from excitonic coupling between aligned porphyrins. The high concentration of haemoglobin in a single cell enables the porphyrins to be in close proximity to permit charge transfer between the haem moieties. The high signal‐to‐noise ratio and excellent reproducibility obtained using Raman water immersion microspectroscopy on single erythrocytes in vivo shows potential as a diagnostic tool for a variety of haemopathies. However, judicious choice of the excitation wavelength is a prerequisite especially if the technique is applied to diagnose oxidation status within erythrocytes. Copyright © 2002 John Wiley & Sons, Ltd." @default.
• W2055280411 created "2016-06-24" @default.
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• W2055280411 date "2002-07-01" @default.
• W2055280411 modified "2023-10-06" @default.
• W2055280411 title "Raman excitation wavelength investigation of single red blood cells <i>in vivo</i>" @default.
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• W2055280411 doi "https://doi.org/10.1002/jrs.870" @default.
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