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Amperometric biosensor based on diamond paste for the enantioanalysis of L-lysine
Raluca-Ioana Stefan-van Staden1, R'afat Mahmoud Nejem2, Jacobus Frederick van Staden1
1Laboratory of Electrochemistry and PATLAB Bucharest, National Institute of Research for Electrochemistry and Condensed Matter, 202 Splaiul Independentei Str., 060021, Bucharest 6, Romania.
Biosensors & Bioelectronics
|March 16, 2012
Summary
A novel amperometric biosensor utilizing L-lysine oxidase in diamond paste enables precise enantioanalysis of L-lysine. This highly selective biosensor offers a low detection limit for L-lysine in serum and pharmaceutical samples.
Area of Science:
- Electrochemistry
- Biosensor Technology
- Analytical Chemistry
Background:
- Enantioselective analysis of amino acids is crucial in pharmaceuticals and diagnostics.
- Existing methods for L-lysine determination can be complex and time-consuming.
- Development of rapid and selective biosensors is needed.
Purpose of the Study:
- To develop and characterize an amperometric biosensor for the enantioselective determination of L-lysine.
- To evaluate the performance of the biosensor in terms of sensitivity, selectivity, and linear range.
- To assess the applicability of the biosensor for real-world sample analysis.
Main Methods:
- Immobilization of L-lysine oxidase enzyme in a diamond paste matrix.
- Amperometric detection at a potential of 650 mV.
- Evaluation of sensor performance using standard L-lysine solutions and various interfering amino acids.
Main Results:
- The biosensor demonstrated a linear response for L-lysine in the concentration range of 1–100 nmol/L.
- A low limit of detection of 4 pmol/L was achieved.
- High selectivity was observed against common amino acids and histamine.
Conclusions:
- The developed amperometric biosensor provides a sensitive and selective method for L-lysine enantioanalysis.
- The biosensor shows potential for application in analyzing L-lysine content in biological and pharmaceutical matrices.
- This approach offers a promising tool for quality control and diagnostic applications.
