Resolution of complex fluorescence spectra recorded on single unpigmented living cells using a computerised method

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Abstract
The identification and quantification of fluorescent compounds in a complex fluorescence spectra are always difficult, especially in the case of low signal:noise ratio.We propose a computerised method that allows the resolution of low light level complex fluorescence spectra into its components.Based on a linear combination of N possible characteristic fluorescence spectra, and using N weighting functions, this method allows the integration of fluorescence intensities over the entire fluorescence spectra and the generation of n equations with N unknowns. The compounds that participate in complex fluorescence spectra are identified and quantified. Because fluorescence intensities can be integrated we can resolve complex fluorescence spectra presenting a low signal:noise ratio. The reliability and sensitivity of our method are shown through examples of resolution of complex intracellular fluorescence of single living cells pretreated with benzo(a)pyrene. Depending on the cell type and treatment, two, four, or five components can be identified in the complex fluorescence spectra.