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Published on: December 1, 2015
Poly-(3-hexylthiophene) self-assembled monolayer based cholesterol biosensor using surface plasmon resonance
Sunil K Arya1, Pratima R Solanki, S P Singh
1Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi, India.
Biosensors & Bioelectronics
|November 23, 2006
Summary
This study developed a novel cholesterol biosensor by immobilizing cholesterol oxidase onto a modified poly(3-hexylthiophene) surface. The resulting biosensor accurately detects cholesterol concentrations with high sensitivity and reusability.
Area of Science:
- Biotechnology
- Biosensor Development
- Surface Chemistry
Background:
- Cholesterol monitoring is crucial for cardiovascular health.
- Existing cholesterol detection methods can be complex and time-consuming.
- Development of sensitive and reusable biosensors is an active research area.
Purpose of the Study:
- To develop a novel biosensor for cholesterol detection.
- To immobilize cholesterol oxidase (ChOx) onto a functionalized poly(3-hexylthiophene) (P3HT) surface.
- To characterize and evaluate the performance of the developed ChOx/FNAB/P3HT/Au bio-electrode.
Main Methods:
- Covalent immobilization of ChOx onto FNAB-modified P3HT SAM on gold.
- Characterization using contact angle, UV-vis spectroscopy, electrochemical impedance, cyclic voltammetry, and AFM.
- Cholesterol concentration estimation using surface plasmon resonance (SPR) technique.
Main Results:
- The ChOx/FNAB/P3HT/Au bio-electrode demonstrated linearity from 50 to 500 mg/dL for cholesterol.
- The SPR biosensor exhibited a detection limit of 50 mg/dL and sensitivity of 1.04 m degrees/(mg dL).
- The biosensor showed reusability for approximately 15 cycles and a shelf-life of 10 weeks at 4°C.
Conclusions:
- The developed SPR biosensor offers a sensitive, reusable, and stable platform for cholesterol estimation.
- This ChOx/FNAB/P3HT/Au bio-electrode represents a promising tool for cholesterol monitoring applications.
- The immobilization strategy provides a robust method for creating functional bio-interfaces.
