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Published on: February 1, 2018
Molecular processes in an electrochemical clozapine sensor
Thomas E Winkler1, Sarah L Lederer2, Eunkyoung Kim3
1MEMS Sensors and Actuators Laboratory (MSAL), Institute for Systems Research, Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742 and Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742.
Biomaterials enhance electrochemical sensing selectivity for schizophrenia drugs. A novel chitosan film differentiates clozapine from its metabolite norclozapine by altering their diffusion and electron transfer kinetics.
Area of Science:
- Electrochemistry
- Biomaterials Science
- Analytical Chemistry
- Pharmacology
Background:
- Direct electrochemical sensing faces selectivity challenges, particularly in monitoring antipsychotic drugs like clozapine for schizophrenia treatment.
- Distinguishing clozapine from its structurally similar metabolite, norclozapine, is critical for accurate therapeutic efficacy assessment due to their similar redox potentials.
Purpose of the Study:
- To investigate the impact of biomaterial integration on the electrochemical behavior of clozapine and norclozapine.
- To develop a selective electrochemical sensing method for differentiating clozapine from norclozapine in clinical samples.
Main Methods:
- Utilized a catechol-modified chitosan film, previously established for direct clozapine quantification in serum.
- Studied changes in diffusion and electron transfer kinetics of clozapine and norclozapine at the biomaterial-modified electrode interface.
Main Results:
- Observed distinct dynamic behaviors between clozapine and norclozapine when interfaced with the chitosan-based biomaterial films.
- Demonstrated that these differing dynamics provide additional redox information for selective sensing.
Conclusions:
- Biomaterial integration, specifically using catechol-modified chitosan, enables selective electrochemical differentiation of structurally analogous molecules like clozapine and norclozapine.
- This approach offers a promising strategy for accurate monitoring of clozapine therapy in schizophrenia patients.
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