In vivo lipidomics using single-cell Raman spectroscopy.

Area of Science:

• Biotechnology
• Spectroscopy
• Lipidomics

Background:

• Algal biodiesel production requires understanding lipid properties like unsaturation and transition temperatures.
• Current methods for lipid analysis are invasive, time-consuming, and may use toxic probes.
• Direct, in vivo analysis of microalgal lipids is needed for efficient biofuel development.

Purpose of the Study:

• To present a novel method for direct, quantitative, in vivo lipid profiling of microalgae.
• To demonstrate the measurement of lipid unsaturation and transition temperatures in single microalgal cells.
• To establish a label-free, real-time analytical approach for microalgal lipidomics.

Main Methods:

• Utilizing single-cell laser-trapping Raman spectroscopy to isolate and analyze individual microalgal cells.
• Developing quantitation algorithms for determining lipid properties from Raman spectral data.
• Monitoring cellular responses to varying growth conditions in real time.

Main Results:

• Successfully determined the degree of unsaturation and transition temperatures of lipids within single microalgal cells.
• Demonstrated the ability to measure these lipid properties directly in vivo without extraction.
• Showcased real-time, label-free chemical information acquisition, avoiding limitations of fluorescent probes.

Conclusions:

• Single-cell laser-trapping Raman spectroscopy offers a rapid, non-invasive method for microalgal lipid profiling.
• This technique is valuable for assessing algal biodiesel quality and monitoring cellular responses.
• The demonstrated analytical capabilities are broadly applicable to various organisms and lipidomics research.