Improvement of enzyme carbon paste-based biosensor using carbon nanotubes for determination of water-soluble analogue of vitamin E
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Milan Sýs
Abstract
The catalytic oxidation of a synthetic water-soluble analogue of vitamin E (α-tocopherol, Trolox) by tyrosinase enzyme in the presence of molecular oxygen was studied using electrochemical techniques. This specific enzymatic reaction was exploited for the preparation of a biosensor based on the amperometric reduction of the electroactive product (α-tocoquinone) formed. An electroactive surface of the transducers used was covered with a thin conductive layer of Nafion containing tyrosinase. Significant progress in sensitivity towards polyphenolic compounds such as Trolox was achieved at CPE with carbon nanotubes immobilised on its surface (CPE/CNTs) as electric transducers. The biosensor so developed can be used for the direct determination of total phenolic content (TPC). This important nutrition value can be expressed as the mass equivalent of Trolox, i.e. Trolox equivalent antioxidant capacity (TEAC), which could be used as an alternative to the evaluations currently used based on spectrophotometric methods such as total radical-trapping antioxidant parameter (TRAP), ferric reducing-antioxidant power (FRAP) or 1,1-diphenyl-2-picrylhydrazyl spectrometric assay (DPPH). The effects of the enzyme amount in the Nafion layer (3.0 μg), the influence of the nanoparticles present, the optimal pH value suitable for enzymatic activity (7.0), and the kinetics of enzymatic and electrochemical reactions were studied using cyclic voltammetry (CV). The determination of optimal conditions for amperometry in batch configuration (working potential, speed of stirring, volume of sample, calibration curve, etc.) was not a target of this electrochemical study.
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© 2015 Institute of Chemistry, Slovak Academy of Sciences
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Articles in the same Issue
- Biosensors – Topical issue
- Biosensors containing acetylcholinesterase and butyrylcholinesterase as recognition tools for detection of various compounds
- Electrochemical enzymatic biosensors based on metal micro-/nanoparticles-modified electrodes: a review
- Gluconobacter sp. cells for manufacturing of effective electrochemical biosensors and biofuel cells
- Application of nanomaterials in microbial-cell biosensor constructions
- Use of green fluorescent proteins for in vitro biosensing
- Biosensors based on molecular beacons
- DNA aptamer-based detection of prostate cancer
- Can glycoprofiling be helpful in detecting prostate cancer?
- Graphene as signal amplifier for preparation of ultrasensitive electrochemical biosensors
- Electrochemical nanostructured biosensors: carbon nanotubes versus conductive and semi-conductive nanoparticles
- Surface plasmon resonance application in prostate cancer biomarker research
- Improvement of enzyme carbon paste-based biosensor using carbon nanotubes for determination of water-soluble analogue of vitamin E
- Enzymatic sensor of putrescine with optical oxygen transducer – mathematical model of responses of sensitive layer
- Detection of hydrogen peroxide and glucose by enzyme product precipitation on sensor surface
- Interfacing of microbial cells with nanoparticles: Simple and cost-effective preparation of a highly sensitive microbial ethanol biosensor
- Whole-cell optical biosensor for mercury – operational conditions in saline water
- Synthesis of carbon quantum dots for DNA labeling and its electrochemical, fluorescent and electrophoretic characterization
- Detection of short oligonucleotide sequences of hepatitis B virus using electrochemical DNA hybridisation biosensor
- Aptamer-based detection of thrombin by acoustic method using DNA tetrahedrons as immobilisation platform
- Interactions of antifouling monolayers: Energy transfer from excited albumin molecule to phenol red dye
- Third-generation oxygen amperometric biosensor based on Trametes hirsuta laccase covalently bound to graphite electrode
- Can voltammetry distinguish glycan isomers?
