Ratiometric Near Infrared Fluorescence Imaging of Dopamine with 1D and 2D nanomaterials

04 April 2024, Version 2
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Neurotransmitters are released by neuronal cells to exchange information. Resolving their spatiotemporal patterns is crucial to understand chemical neurotransmission. Here, we present a ratiometric sensor for the neurotransmitter dopamine that combines Egyptian Blue (CaCuSi4O10) nanosheets (EB-NS) and single-walled carbon nanotubes (SWCNTs). They both fluoresce in near infrared (NIR), which is beneficial due to ultra-low background and phototoxicity. (GT)10-DNA functionalized monochiral (6,5)-SWCNTs increase their fluorescence (1000 nm) in response to dopamine, while EB-NS serves as stable reference (936 nm). A robust ratiometric imaging scheme is implemented by directing these signals on two different NIR sensitive cameras. Additionally, we demonstrate stability against mechanical perturbations and image dopamine release from differentiated dopaminergic Neuro 2a cells. Therefore, this technique enables robust ratiometric and non-invasive imaging of cellular responses.

Keywords

biosensors
fluorescence
near infrared
ratiometric
nanosheets
carbon nanotubes
dopamine
neuroscience

Supplementary materials

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Supplementary Information
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Additional spectral simulations, absorption spectra, additional fluorescence spectra, additional fluorescence microscopy images, details on fit parameters
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Movie M1
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Additional Movie to Figure 3c
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Movie M2
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Additional Movie to Figure 4c
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Movie M3
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Additional Movie to Figure 5b
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