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Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents

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Surface modification on acoustic wave biosensors for enhanced specificity.

Onursal Onen¹, Asad A Ahmad, Rasim Guldiken

¹Department of Mechanical Engineering, University of South Florida, 4202 E Fowler Ave, ENB 118, Tampa, FL 33620, USA. onursalonen@mail.usf.edu

Sensors (Basel, Switzerland)

|November 1, 2012

Summary

Researchers developed a novel surface modification for acoustic biosensors to detect B-cell lymphoma 2 protein (Bcl-2), a potential ovarian cancer biomarker. This enhanced biosensor offers sensitive and specific detection for early cancer diagnosis.

Keywords:

Bcl-2 bioconjugation early detection microelectromechanical systems (MEMS)ovarian cancer point-of-care polyethylene glycol (PEG)self-assembled monolayer (SAM)sensor surface acoustic wave (SAW)

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Area of Science:

Biomedical Engineering
Biosensor Technology
Cancer Biomarkers

Background:

Acoustic biosensors detect analytes via mass loading-induced frequency shifts.
Early ovarian cancer detection requires sensitive and specific biomarkers like B-cell lymphoma 2 protein (Bcl-2).
Optimizing surface chemistry is crucial for biosensor performance and minimizing non-specific adsorption.

Purpose of the Study:

To evaluate surface chemistry and biofunctionalization for effective Bcl-2 antibody presentation.
To minimize non-specific protein adsorption on acoustic biosensor surfaces.
To develop a sensitive and specific biosensor for early ovarian cancer detection using Bcl-2.

Main Methods:

Sequential adsorption of protein A/G, anti-Bcl-2 IgG, and Pluronic F127 onto a hydrophobic surface.
Optimization of surface chemistry for enhanced signal-to-noise ratio.
Application of optimal surface modification to a prototype surface acoustic wave (SAW) biosensor for Bcl-2 detection.

Main Results:

The optimal surface modification strategy significantly improved signal-to-noise ratio for Bcl-2 detection.
Reliable detection of Bcl-2 concentrations below early-stage ovarian cancer levels was achieved.
The prototype SAW biosensor demonstrated effective frequency shift quantification across a range of Bcl-2 concentrations.

Conclusions:

The developed surface functionalization enables specific and sensitive detection of Bcl-2.
This approach is effective for ultrasonic MEMS biosensor prototypes.
The methodology can be adapted for detecting other biomarkers and enhancing acoustic biosensors.