Bio-/haemocompatibility: implications and outcomes for sensors?

Area of Science:

• Biomedical Engineering
• Materials Science
• Electrochemistry

Background:

• Biosensors face challenges with biocompatibility and surface fouling when in contact with biological samples.
• This leads to time-dependent signal drift, especially in intravascularly implanted devices, impacting accuracy.

Purpose of the Study:

• To investigate practical methods for reducing signal drift and fouling in biosensors.
• To understand the electrode-environment interface for improved biosensor design.

Main Methods:

• Surface modification of diffusion-limiting membranes (varying film porosity).
• Biomimicry of cell membranes.
• Incorporation of inner perm-selective membranes in amperometric electrodes.
• Use of low polarization potentials.
• Creating an aqueous barrier to prevent cellular component passage.

Main Results:

• Surface modification and biomimicry offer potential solutions to electrode passivation.
• Perm-selective membranes and low polarization potentials reduce interference from surface-active compounds.
• Aqueous barriers physically prevent cellular components from reaching the sensor surface.

Conclusions:

• Careful selection of sensor systems and materials is crucial for developing biocompatible, non-fouling devices.
• These advancements are vital for reliable clinical monitoring in critically ill patients.