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Related Experiment Videos

Protein interactions with subcutaneously implanted biosensors.

Raeann Gifford1, Joseph J Kehoe, Sandra L Barnes

  • 1Department of Chemistry, University of Kansas, Lawrence, 66045, USA.

Biomaterials
|December 21, 2005
PubMed
Summary

Biofouling causes glucose sensor failure. Proteomics identified protein fragments, not whole proteins, infiltrating membranes, reducing glucose sensor sensitivity within 24 hours of implantation.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Biochemistry

Background:

  • Biofouling of implantable glucose sensors leads to sensitivity loss within 24 hours.
  • Understanding the specific biomolecules responsible for this early biofouling is crucial for improving sensor performance.

Purpose of the Study:

  • To identify the biomolecules causing sensitivity loss in in vivo glucose sensors.
  • To investigate the composition of biofouling on glucose sensors after 24 hours of implantation.

Main Methods:

  • Active needle-type glucose sensors were implanted in Sprague-Dawley rats for 24 hours.
  • Proteomics, including MALDI-TOF mass spectrometry, was used to analyze sensor leachate and membrane-absorbed species.

Main Results:

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  • Serum albumin fragments were identified as the predominant biomolecule on sensor membranes.
  • Numerous other biomolecular fragments, primarily under 15 kD, were also detected.
  • The presence of these fragments, rather than intact proteins, was significant.

Conclusions:

  • Infiltration of smaller biomolecular fragments into sensor membranes diminishes glucose diffusivity.
  • This infiltration is concluded to be the primary cause of decreased in vivo glucose sensor sensitivity.
  • Targeting these fragments may offer a strategy to mitigate early sensor biofouling.