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High frequency dielectrophoretic response of microalgae over time
Hanieh Hadady1, Johnson J Wong, Sage R Hiibel
1Mechanical Engineering Department, University of Nevada, Reno, USA.
Electrophoresis
|September 18, 2014
Summary
High-frequency dielectrophoresis effectively separates microalgae by lipid content. Lipid accumulation alters cell dielectric properties, enabling separation of Chlamydomonas reinhardtii based on their lipid levels.
Area of Science:
- Biotechnology
- Cell Biology
- Biophysics
Background:
- Microalgae are a promising source of biofuels and high-value compounds.
- Efficiently separating microalgae based on desired traits, like lipid content, is crucial for industrial applications.
- Dielectrophoresis (DEP) is a label-free technique that uses non-uniform electric fields to manipulate cells.
Purpose of the Study:
- To investigate the high-frequency dielectrophoresis (DEP) response of microalgae with varying lipid content.
- To determine if DEP can be used to separate microalgae based on their lipid accumulation.
- To correlate changes in DEP response with cellular lipid content and media conductivity.
Main Methods:
- Culturing Chlamydomonas reinhardtii under varying nutrient conditions to produce low and high lipid content cells.
- Monitoring high-frequency DEP ( >20 MHz) response and media conductivity over time.
- Quantifying relative lipid content using BODIPY 505/515 fluorescence imaging.
Main Results:
- The upper crossover frequency in DEP response decreased over time for high-lipid cells, indicating altered cytoplasmic dielectric properties.
- DEP response of low-lipid cells varied with media conductivity due to nutrient consumption.
- Microalgae cells were successfully separated based on lipid content at 41 MHz and a specific DEP media conductivity.
Conclusions:
- High-frequency DEP is sensitive to changes in microalgal lipid content.
- Lipid accumulation significantly impacts the dielectric properties of microalgae cells.
- DEP offers a viable method for label-free separation of microalgae based on lipid content.
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