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Resonance Raman spectroscopy of optically trapped functional erythrocytes

Kerstin Ramser ; Katarina Logg (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Mattias Goksör ; Jonas Enger ; Mikael Käll (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Dag Hanstorp
Journal of Biomedical Optics (1083-3668). Vol. 9 (2004), 3, p. 593-600.
[Artikel, refereegranskad vetenskaplig]

We introduce a novel setup combining a micro-Raman spectrometer with external optical tweezers, suitable for resonance Raman studies of single functional trapped cells. The system differs from earlier setups in that two separate laser beams used for trapping and Raman excitation are combined in a double-microscope configuration. This has the advantage that the wavelength and power of the trapping and probe beam can be adjusted individually to optimize the functionality of the setup and to enable the recording of resonance Raman profiles from a single trapped cell. Trapping is achieved by tightly focusing infrared (IR) diode laser radiation (830 nm) through an inverted oil-immersion objective, and resonance Raman scattering is excited by the lines of an argon:krypton ion laser. The functionality of the system is demonstrated by measurements of trapped single functional erythrocytes using different excitation lines (488.0, 514.5, and 568.2 nm) in resonance with the heme moiety and by studying spectral evolution during illumination. We found that great care has to be taken in order to avoid photodamage caused by the visible Raman excitation, whereas the IR trapping irradiation does not seem to harm the cells or alter the hemoglobin Raman spectra. Stronger photodamage is induced by Raman excitation using 488.0- and 514.5-nm irradiation, compared with excitation with the 568.2-nm line.



Denna post skapades 2007-10-05. Senast ändrad 2017-10-03.
CPL Pubid: 51738

 

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Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)

Ämnesområden

Optik
Biologisk fysik

Chalmers infrastruktur

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