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Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors

Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors

Published on: November 20, 2013

Nanostructured porous silicon as functionalized material for biosensor application.

Shalini Singh¹, Shailesh N Sharma, Govind

¹Electronic Materials Division, National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India.

Journal of Materials Science. Materials in Medicine

|July 4, 2008

Summary

Porous silicon (PS) films were biofunctionalized for immunosensors. This method covalently binds antibodies, enabling reproducible detection of antigen concentrations for future biosensor applications.

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Synthesis, Functionalization, and Characterization of Fusogenic Porous Silicon Nanoparticles for Oligonucleotide Delivery

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Area of Science:

Materials Science
Biotechnology
Nanotechnology

Background:

Porous silicon (PS) films possess advantageous mechanical and optical properties.
Biofunctionalization is crucial for developing advanced biosensing platforms.

Purpose of the Study:

To biofunctionalize porous silicon (PS) films for potential application in immunosensors.
To enable covalent binding of antibodies onto the PS surface for antigen detection.

Main Methods:

Characterization of PS films using photoluminescence (PL), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS).
Surface functionalization via silanization using aminopropyltriethoxysilane (APTS).
Immobilization of Human IgG antibodies using glutaraldehyde as a linker.

Main Results:

Successful functionalization of the PS surface with reactive amino groups.
Covalent attachment of Human IgG antibodies demonstrated.
Reproducible detection of varying antigen concentrations achieved.

Conclusions:

Biofunctionalized PS films are promising materials for immunosensor development.
The established method allows for sensitive and reproducible antigen detection.
This approach opens possibilities for future biosensor technologies.