13 March 2013 Measurement of absolute cell volume, osmotic membrane water permeability, and refractive index of transmembrane water and solute flux by digital holographic microscopy
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J. of Biomedical Optics, 18(3), 036007 (2013). doi:10.1117/1.JBO.18.3.036007
Abstract
A dual-wavelength digital holographic microscope to measure absolute volume of living cells is proposed. The optical setup allows us to reconstruct two quantitative phase contrast images at two different wavelengths from a single hologram acquisition. When adding the absorbing dye fast green FCF as a dispersive agent to the extracellular medium, cellular thickness can be univocally determined in the full field of view. In addition to the absolute cell volume, the method can be applied to derive important biophysical parameters of living cells including osmotic membrane water permeability coefficient and the integral intracellular refractive index (RI). Further, the RI of transmembrane flux can be determined giving an indication about the nature of transported solutes. The proposed method is applied to cultured human embryonic kidney cells, Chinese hamster ovary cells, human red blood cells, mouse cortical astrocytes, and neurons.
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Daniel Boss, Jonas Kühn, Pascal Jourdain, Christian D. Depeursinge, Pierre J. Magistretti, Pierre P. Marquet, "Measurement of absolute cell volume, osmotic membrane water permeability, and refractive index of transmembrane water and solute flux by digital holographic microscopy," Journal of Biomedical Optics 18(3), 036007 (13 March 2013). http://dx.doi.org/10.1117/1.JBO.18.3.036007
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KEYWORDS
Water

Digital holography

Refractive index

Neurons

Holography

Microscopy

Holograms

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