An Ensemble and Single-molecule Fluorescence Spectroscopy Investigation of Calcium Green 1, a Calcium-ion Sensor |
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Authors: | Yin Lu Matthew F. Paige |
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Affiliation: | (1) Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK, S7N 5C9, Canada |
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Abstract: | The calcium-ion indicator dye, Calcium Green 1 (CG-1), has been characterized using a combination of ensemble and single-molecule optical spectroscopy measurements. In terms of ensemble measurements, CG-1 demonstrated a strong increase in fluorescence emission as a function of increasing [Ca2+]. This was accompanied by a change in the relative proportions of two chemical forms of the dye, each with a different fluorescence lifetime, which were found to co-exist in solution. From single-molecule fluorescence measurements, it was found that the fluorescence intensity and photobleaching time (on-time) of each CG-1 molecule was invariant with [Ca2+] and that changes in ensemble fluorescence intensity simply correlates with the number of fluorescent molecules in solution. These results are compared with that of the related system, Calcium Green 2 (CG-2), and the mechanisms of operation of these two indicator dyes are discussed. |
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Keywords: | Fluorescence Spectroscopy Single-molecule Calcium-ion Sensor |
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