4.8 Article

Analysis of Fixed and Live Single Cells Using Optical Photothermal Infrared with Concomitant Raman Spectroscopy

期刊

ANALYTICAL CHEMISTRY
卷 93, 期 8, 页码 3938-3950

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AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c04846

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  1. North West Centre of Advanced Drug Delivery (NoWCADD)
  2. University of Manchester Faculty of Science and Engineering

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This study demonstrates the first use of a novel completely optically-based photothermal method to obtain infrared spectra of biological cells and to combine it with Raman spectra at submicron spatial resolution. The new instrumentation is capable of analyzing subcellular structures, identifying protein secondary structures, and lipid-rich bodies on the submicron scale, showing great potential in cell analysis.
This paper reports the first use of a novel completely optically based photothermal method (O-PTIR) for obtaining infrared spectra of both fixed and living cells using a quantum cascade laser (QCL) and optical parametric oscillator (OPO) laser as excitation sources, thus enabling all biologically relevant vibrations to be analyzed at submicron spatial resolution. In addition, infrared data acquisition is combined with concomitant Raman spectra from exactly the same excitation location, meaning the full vibrational profile of the cell can be obtained. The pancreatic cancer cell line MIA PaCa-2 and the breast cancer cell line MDA-MB-231 are used as model cells to demonstrate the capabilities of the new instrumentation. These combined modalities can be used to analyze subcellular structures in both fixed and, more importantly, live cells under aqueous conditions. We show that the protein secondary structure and lipid-rich bodies can be identified on the submicron scale.

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