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Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
Published on: February 10, 2014
Characterisation of a label-free biosensor based on long period grating
Francesco Chiavaioli1, Cosimo Trono, Ambra Giannetti
1IFAC-CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy.
Journal of Biophotonics
|November 6, 2012
Summary
This study introduces a novel optical fiber biosensor using Eudragit L100 copolymer for enhanced biochemical sensing. The long period grating biosensor effectively detects antigen-antibody interactions with high sensitivity.
Area of Science:
- Biomedical Engineering
- Optical Sensing
- Biochemistry
Background:
- Optical fibre gratings, particularly long period gratings (LPGs), are emerging as sensitive platforms for label-free biochemical sensing.
- Biochemical interactions on the grating surface alter the refractive index, causing measurable shifts in the transmission spectrum.
- Existing label-free optical sensing methods include surface plasmon resonance (SPR), interferometry, and optical resonators.
Purpose of the Study:
- To develop and characterize a novel optical fiber biosensor for biochemical detection.
- To investigate the use of Eudragit L100 copolymer for fiber biofunctionalization as an alternative to traditional silanization.
- To compare the performance of LPG biosensors with different grating periods for an antigen-antibody assay.
Main Methods:
- Biofunctionalization of optical fibers using Eudragit L100 copolymer.
- Development of a long period grating (LPG) based biosensor.
- Analysis of antigen-antibody interactions using an IgG/anti-IgG bioassay.
- Characterization of biosensor kinetics and calibration curve generation.
- Comparative performance analysis of two LPGs with distinct grating periods.
Main Results:
- The Eudragit L100 copolymer enabled effective fiber biofunctionalization for biosensing applications.
- The LPG biosensor successfully monitored antigen-antibody interactions, demonstrating label-free detection capabilities.
- Kinetic monitoring of antibody immobilization and antigen binding was achieved.
- A calibration curve for the IgG/anti-IgG bioassay was successfully generated.
- Performance differences were observed between LPGs with different grating periods.
Conclusions:
- The developed optical fiber biosensor utilizing Eudragit L100 copolymer offers a promising label-free detection platform for biochemical sensing.
- The novel biofunctionalization chemistry provides a viable alternative to silanization procedures.
- LPGs with optimized grating periods can enhance biosensor performance for specific bioassays.
