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Optimization and characterization of a homogeneous carboxylic surface functionalization for silicon-based biosensing
Alessandro Chiadò1, Gianluca Palmara1, Serena Ricciardi1
1Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy.
Colloids and Surfaces. B, Biointerfaces
|March 30, 2016
Summary
Optimizing chemical modification of silicon surfaces enhances biosensor performance. The 3-aminopropylsilane (APTES) and succinic anhydride (SA) method creates a superior, stable bio-receptor layer for sensitive and reproducible detection.
Area of Science:
- Surface chemistry
- Biomaterials science
- Biosensor technology
Background:
- Bio-receptor immobilization is critical for biosensor reproducibility, sensitivity, and specificity.
- Controlled surface functionalization is key to achieving stable bio-receptor layers on sensor surfaces.
Purpose of the Study:
- To present and optimize a chemical modification protocol for silicon-based biosensor surfaces.
- To compare the APTES/SA functionalization with glutaraldehyde (GA) crosslinking and plasma polymerized acrylic acid (PPAA) thin films.
Main Methods:
- Anhydrous silanization with 3-aminopropylsilane (APTES) followed by derivatization with succinic anhydride (SA).
- Physico-chemical characterizations including optical contact angle (OCA), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM).
- Functional evaluation using a Protein G/Antibody immunoassay.
Main Results:
- The APTES/SA method generates an ordered, flat layer of carboxylic groups on silicon surfaces.
- Comparison with GA and PPAA methods revealed advantages and drawbacks of each approach.
- The optimized APTES/SA coupling resulted in the most homogeneous, reproducible, and active surface.
Conclusions:
- The optimized APTES/SA chemical modification protocol provides a superior surface for bio-receptor immobilization in biosensing applications.
- This method offers enhanced performance characteristics compared to established GA crosslinking and PPAA thin film deposition.
