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Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
Published on: April 28, 2022
Coherent anti-Stokes Raman scattering and spontaneous Raman spectroscopy and microscopy of microalgae with nitrogen
1Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA.
Biomedical Optics Express
|November 20, 2012
Summary
Researchers used Raman spectroscopy and CARS microscopy to analyze lipid accumulation in microalgae. These techniques effectively monitored triacylglycerol (TAG) growth, crucial for biofuel research.
Area of Science:
- Biotechnology
- Spectroscopy
- Microalgal research
Background:
- Microalgae are key feedstocks for biofuel production.
- Efficient characterization of energy-rich compounds like lipids is vital for understanding metabolic pathways and accumulation factors.
- Triacylglycerols (TAGs) accumulate significantly in the model green alga Coccomyxa under nitrogen depletion.
Purpose of the Study:
- To monitor the growth of TAGs (lipids) in microalgal cells.
- To investigate the suitability of spontaneous Raman and coherent anti-Stokes Raman scattering (CARS) spectroscopy and microscopy for analyzing microalgae.
- To observe the distribution of lipid droplets within microalgal cells.
Main Methods:
- Utilized spontaneous Raman spectroscopy to analyze the chemical components within algal cells.
- Employed CARS microscopy to specifically monitor the spatial distribution of lipid droplets.
- Studied the microalgal strain Coccomyxa sp. C169 under varying nitrogen conditions.
Main Results:
- Raman signals of carotenoids were higher in control microalgae than in nitrogen-depleted cells.
- Lipid droplets became detectable via Raman signals following nitrogen depletion.
- CARS microscopy clearly visualized the distribution of these lipid droplets within the cells.
Conclusions:
- Both spontaneous Raman spectroscopy and CARS microscopy are effective analytical tools for microalgae.
- These spectroscopic methods enable detailed monitoring of lipid accumulation and distribution in microalgae.
- The findings support the use of these techniques in biofuel feedstock research.
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