22 February 2010 Fluorescence-free biochemical characterization of cells using modulated Raman spectroscopy
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The use of Raman spectroscopy for biomedical applications requires overcoming the obstacle of the broad fluorescence background that is generally generated in biological samples. Recently, we have developed a new modulation method for separating the weak Raman peaks from the strong fluorescence background. The novel method is based on the periodical modulation of the excitation wavelength and uses the principle of multi-channel lock-in detection. By continuously modulating the excitation wavelength it is possible to shift the Raman peaks while the fluorescence background remains essentially constant. The powerful capabilities of this novel method are demonstrated by acquiring spectra from different location (nucleus, cytoplasm and membrane) inside a CHO cell. In fact, we show that our modulated Raman spectroscopy provides, with higher efficiency than the standard one, Raman spectra of different locations within a single cell, suggesting that this minimally invasive optical technology could be applied for bio-medical diagnosis and imaging.
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Anna Chiara De Luca, Anna Chiara De Luca, Michael Mazilu, Michael Mazilu, Andrew Riches, Andrew Riches, Simon Herrington, Simon Herrington, Kishan Dholakia, Kishan Dholakia, } "Fluorescence-free biochemical characterization of cells using modulated Raman spectroscopy", Proc. SPIE 7555, Advanced Biomedical and Clinical Diagnostic Systems VIII, 755517 (22 February 2010); doi: 10.1117/12.841686; https://doi.org/10.1117/12.841686

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