Microvesicle detection by a reduced graphene oxide field-effect transistor biosensor based on a membrane...

Area of Science:

• Biotechnology
• Biosensor Technology
• Extracellular Vesicle Research

Background:

• Microvesicles (MVs) lack universal surface markers, hindering the detection of the entire MV population, unlike other extracellular vesicle (EV) subtypes.
• Existing detection methods face challenges in sensitivity and specificity for comprehensive MV analysis.

Purpose of the Study:

• To develop a highly sensitive and universal detection method for microvesicles (MVs).
• To establish a field-effect transistor (FET) biosensor platform for accurate MV quantification and differentiation.

Main Methods:

• A membrane biotinylation strategy was employed using DSPE-PEG-biotin to label MVs, achieving 92.6% biotinylation efficiency.
• A reduced graphene oxide (RGO)-based FET biosensor was fabricated and modified with streptavidin (SA) probes.
• The SA-modified RGO-FET specifically recognized biotinylated MVs (B-MVs) through high-affinity SA-biotin interactions.

Main Results:

• The RGO-FET biosensor detected B-MVs over a wide concentration range (10^5 to 10^9 particles/mL) with a low detection limit of 20 particles/μL.
• The biosensor demonstrated excellent specificity, distinguishing B-MVs from other EV types like exosomes.
• The platform successfully detected B-MVs from various cell lines, including cancer and normal cells, highlighting its versatility.

Conclusions:

• The RGO-based FET biosensor provides a highly sensitive and specific platform for detecting microvesicles (MVs) via membrane biotinylation.
• This method overcomes the challenge of lacking universal MV markers and shows significant potential for biomedical applications, including disease diagnostics.