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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...

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Dual-function nanofilm coatings with diffusion control and protein resistance.

Jaebum Park1, Michael J McShane

  • 1Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA.

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Polyelectrolyte multilayers (PEMs) offer dual functionality for biosensors, controlling diffusion and resisting proteins. Strong-weak PEMs provide stable glucose transport, unlike weak-weak pairs susceptible to biofouling.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Polyelectrolyte multilayers (PEMs) assembled via layer-by-layer nanoassembly offer potential for multifunctional coatings.
  • Optimizing PEMs for implantable biosensors requires simultaneous control over diffusion and resistance to biofouling.

Purpose of the Study:

  • To design and evaluate PEM coatings for implantable biosensors with combined diffusion control and protein resistance.
  • To compare the performance of strong-weak and weak-weak polyelectrolyte pairs in PEM coatings.

Main Methods:

  • Fabrication of PEM coatings using strong-weak and weak-weak polyelectrolyte pairs.
  • Incorporation of poly(ethylene glycol) (PEG)-grafted terminal layers for enhanced protein resistance.
  • Measurement of glucose diffusivity and assessment of protein adsorption (albumin) and biofouling effects.

Main Results:

  • PEM coatings reduced glucose diffusivity by up to 5 orders of magnitude.
  • PEG-grafted layers significantly improved resistance to albumin adsorption compared to unmodified PEMs.
  • Strong-weak PEMs maintained consistent diffusivity after protein exposure, indicating biofouling resistance.
  • Weak-weak PEMs showed altered transport behavior and variable diffusivity upon protein exposure.

Conclusions:

  • PEMs can be engineered as effective coatings for biosensors, providing both diffusion control and protein resistance.
  • Strong-weak polyelectrolyte pairs are superior for stable transport properties in protein-rich environments.
  • The choice of polyelectrolyte pairs is critical for achieving robust and reliable biosensor performance.