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Related Concept Videos

Dialysis01:15

Dialysis

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Microdialysis SPR: diffusion-gated sensing in blood.

Julien Breault-Turcot1, Jean-Francois Masson1,2

  • 1Departement de chimie , Université de Montréal , CP 6128 Succ. Centre-Ville , Montreal , QC H3C 3J7 , Canada . Email: jf.masson@umontreal.ca ; Tel: +1-514-343-7342.

Chemical Science
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Summary

A novel dialysis chamber integrated with a surface plasmon resonance (SPR) biosensor enables direct chemical measurements in whole blood. This innovation overcomes biofluid interference, allowing for precise detection without sample pre-treatment.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biosensing Technology

Background:

  • Direct chemical measurements in whole blood are challenging due to sensor fouling by proteins and cells.
  • Existing biosensors struggle with interference from complex biological matrices like blood and serum.
  • Optical biosensing methods face limitations from scattering and absorption by blood components.

Purpose of the Study:

  • To develop a method for direct biomolecular interaction monitoring in untreated whole blood.
  • To overcome limitations of biosensor performance in complex biofluids.
  • To enable sensitive detection of small molecules in whole blood using surface plasmon resonance (SPR).

Main Methods:

  • Integration of a dialysis chamber with an SPR biosensor to act as a diffusion gate.
  • Utilizing a microporous membrane for size-based filtering of blood components.
  • Leveraging differential diffusion rates of small molecules towards the sensor surface.

Main Results:

  • Successfully monitored the affinity of a peptide (DBG178) targeting CD36 in human serum and whole blood at micromolar concentrations.
  • Demonstrated effective size filtering and diffusion control, minimizing interference from blood cells and large biomolecules.
  • Achieved direct detection without the need for sample pre-treatment.

Conclusions:

  • The developed dialysis chamber SPR biosensor concept allows for direct, sensitive detection in whole blood.
  • This approach significantly reduces biofluid interference, enhancing biosensor performance.
  • Potential applications include point-of-care diagnostics, pharmacokinetic studies, and disease monitoring.