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Measuring Vesicle Loading with Holographic Microscopy and Bulk Light Scattering.

Lan Hai Anh Tran1, Lauren A Lowe1,2, Yaam Deckel1,2

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Summary

This study introduces a novel method using digital holographic microscopy to quantify the loading of cell-sized lipid vesicles without fluorescent or radioactive tracers. The technique accurately measures vesicle refractive index and loading for both cell-sized and nanoscale vesicles.

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Area of Science:

  • Biophysics
  • Optical Microscopy
  • Nanotechnology

Background:

  • Quantifying the loading of lipid vesicles is crucial for various applications, including drug delivery and synthetic biology.
  • Traditional methods often rely on fluorescent or radioactive tracers, which can be invasive or introduce artifacts.
  • Developing non-invasive and accurate quantification techniques is essential for advancing vesicle research.

Purpose of the Study:

  • To develop and validate a method for quantifying the loading of cell-sized lipid vesicles using in-line digital holographic microscopy.
  • To demonstrate the applicability of this technique for both cell-sized and nanoscale vesicles.
  • To establish a tracer-free approach for vesicle loading quantification.

Main Methods:

  • Utilized in-line digital holographic microscopy with a single-color LED light source.
  • Modeled vesicle scattering using the Lorenz-Mie light scattering model.
  • Compared holographic data with scattering models to determine vesicle refractive index and loading.
  • Applied bulk light scattering measurements for nanoscale vesicle loading retrieval.

Main Results:

  • Successfully quantified the loading of cell-sized lipid vesicles without the need for fluorescent or radioactive reporters.
  • Determined the refractive index of vesicles, which directly correlates to their loading.
  • Extended the method to retrieve vesicle loading for nanoscale vesicles using bulk light scattering measurements.

Conclusions:

  • In-line digital holographic microscopy offers a non-invasive and accurate alternative for quantifying lipid vesicle loading.
  • The developed method eliminates the need for potentially confounding tracers.
  • This technique has broad implications for research and development involving lipid-based nanostructures.