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Bridging the Bio-Electronic Interface with Biofabrication
Published on: June 6, 2012
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A highly sensitive and stable glucose biosensor using thymine-based polycations into laponite hydrogel films.
Veronica I Paz Zanini1, Maximiliano Gavilán1, Beatriz A López de Mishima1
1Instituto de Bionanotecnología, del NOA (INBIONATEC) CONICET-Universidad Nacional de Santiago del Estero (UNSE), RN9, Km 1125, G4206XCP Santiago del Estero, Argentina.
Talanta
|February 4, 2016
Summary
DNA-inspired polycations enhance glucose bioelectrode sensitivity and stability. The best polycation, [(VBT)(VBA)8](8+)≈25, significantly improved glucose oxidase immobilization for accurate glucose sensing in real samples.
Area of Science:
- Electrochemistry
- Biomaterials Science
- Biosensors
Background:
- Glucose bioelectrodes are crucial for monitoring glucose levels.
- Improving enzyme immobilization and electrode stability is key for sensitive biosensors.
- DNA-inspired materials offer novel properties for bio-interfacing.
Purpose of the Study:
- To develop highly sensitive and stable glucose bioelectrodes using DNA-inspired polycations.
- To investigate the effect of polycation structure and charge density on bioelectrode performance.
- To evaluate the practical application of these bioelectrodes for glucose determination in complex samples.
Main Methods:
- Preparation of glucose oxidase (GOx) bioelectrodes by immobilizing GOx into laponite hydrogel films containing DNA-inspired polycations [(VBT)m(VBA)n](n+)≈25 on a glassy carbon electrode.
- Characterization using chronoamperometry, cyclic voltammetry, and electrochemical impedance spectroscopy.
- Testing bioelectrode selectivity and stability in powder milk and blood serum samples.
Main Results:
- Electrochemical properties of laponite hydrogel films significantly improved with thymine-based polycations, correlating with positive charge density.
- Glucose oxidase immobilization led to increased bioelectrode sensitivity proportional to polycation charge density.
- The [(VBT)(VBA)8](8+)≈25 polycation yielded the highest sensitivity (se=176 mA mmol(-1)Lcm(-2)U(-1)), an order of magnitude greater than other reported electrodes.
- The bioelectrode demonstrated selective glucose determination without interference from ascorbic or uric acids in milk and serum samples.
Conclusions:
- DNA-inspired water-soluble polycations are suitable for enzyme immobilization (e.g., GOx) in laponite hydrogels.
- The developed bioelectrodes exhibit high sensitivity and long-term stability for glucose sensing.
- These findings highlight the potential of bio-inspired materials for advanced biosensor development.
