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Amperometric tyrosinase biosensor based on Fe3O4 nanoparticles-chitosan nanocomposite
Shengfu Wang1, Yumei Tan, Dongming Zhao
1Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China. wangsf@hubu.edu.cn
Biosensors & Bioelectronics
|April 5, 2008
Summary
A new tyrosinase biosensor using iron oxide nanoparticles and chitosan detects phenolic compounds. This cost-effective method offers a promising approach for analyzing environmental contaminants.
Area of Science:
- Biotechnology
- Environmental Science
- Analytical Chemistry
Background:
- Phenolic compounds are widespread environmental contaminants.
- Accurate detection of phenolic compounds is crucial for environmental monitoring.
- Development of sensitive and selective biosensors is needed for efficient analysis.
Purpose of the Study:
- To develop a novel tyrosinase biosensor for detecting phenolic compounds.
- To utilize a nanocomposite of iron(3) oxide nanoparticles and chitosan for enzyme immobilization.
- To optimize and validate the biosensor's performance for environmental sample analysis.
Main Methods:
- Fabrication of a tyrosinase-immobilized Fe(3)O(4) nanoparticle-chitosan nanocomposite film.
- Characterization using atomic force microscopy and AC impedance spectroscopy.
- Amperometric detection of biocatalytically liberated quinone at -0.2V vs. SCE.
Main Results:
- The biosensor demonstrated a linear detection range for catechol from 8.3 x 10(-8) to 7.0 x 10(-5) mol L(-1).
- A low detection limit of 2.5 x 10(-8) mol L(-1) was achieved.
- The biosensor exhibited good repeatability, stability, and retained enzyme bioactivity.
Conclusions:
- The developed tyrosinase biosensor is effective for the rapid, simple, and cost-effective detection of phenolic compounds.
- The Fe(3)O(4) nanoparticle-chitosan nanocomposite provides a suitable matrix for enzyme immobilization, enhancing biosensor performance.
- This strategy can be extended to develop other enzyme-based biosensors for various analytes.
