Multimodal spectral imaging of cells using a transmission diffraction grating on a light microscope

Area of Science:

• Cell biology
• Microscopy
• Spectroscopy

Background:

• Multimodal imaging provides comprehensive cellular information.
• Current spectral imaging techniques can be complex and expensive.

Purpose of the Study:

• To develop an affordable multimodal spectral imaging methodology for cells.
• To enable concurrent spectral data acquisition across various microscopy modes.

Main Methods:

• Utilized a transmission diffraction grating on a light microscope.
• Integrated fluorescence, darkfield, brightfield, and differential interference contrast (DIC) spectral microscopy.
• Employed a charge-coupled device (CCD) camera for data capture.

Main Results:

• Successfully performed fluorescence spectral imaging of yeast and mammalian cells with multiple fluorophores.
• Achieved spatial separation of cellular components (nuclei, cytoskeleton, mitochondria) based on fluorescence spectra.
• Enabled measurement of scattering and absorption spectra of unlabeled cells and stained tissue sections.

Conclusions:

• The presented methodology offers a cost-effective approach for multimodal spectral characterization of biological specimens.
• This technique provides detailed, multi-colored spectral images of cells and organelles.
• Facilitates advanced analysis of cellular structures and biomolecules.