AI Article Synopsis
- Improved biosensors for detecting acetaldehyde were developed using a technique that combines two enzymes and a modified carbon electrode.
- The carbon film electrode was enhanced with a mediator for better sensitivity, and the enzymes were immobilized using specific methods to ensure their effectiveness.
- The new biosensors demonstrated reliable performance with linear response ranges, low detection limits, and good stability, proving useful for measuring acetaldehyde in natural samples like wine.
Article Abstract
Improved biosensors for acetaldehyde determination have been developed using a bienzymatic strategy, based on a mediator-modified carbon film electrode and co-immobilisation of NADH oxidase and aldehyde dehydrogenase. Modification of the carbon film electrode with poly(neutral red) mediator resulted in a sensitive, low-cost and reliable NADH detector. Immobilisation of the enzymes was performed using encapsulation in a sol-gel matrix or cross-linking with glutaraldehyde. The bienzymatic biosensors were characterized by studying the influence of pH, applied potential and co-factors. The sol-gel and glutaraldehyde biosensors showed a linear response up to 60 microM and 100 microM, respectively, with detection limits of 2.6 microM and 3.3 microM and sensitivities were 1.7 microA mM(-1) and 5.6 microA mM(-1). The optimised biosensors showed good stability and good selectivity and have been tested for application for the determination of acetaldehyde in natural samples such as wine.
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| http://dx.doi.org/10.1016/j.aca.2007.03.047 | DOI Listing |
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