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Electro-oxidation of phenol on a new type of zeolite/graphite biocomposite electrode with horseradish peroxidase

✍ Scribed by R.H. Carvalho; F. Lemos; M.A.N.D.A. Lemos; J.M.S. Cabral; F. Ramôa Ribeiro

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
534 KB
Volume
278
Category
Article
ISSN
1381-1169

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✦ Synopsis

A novel biocomposite electrode containing horseradish peroxidase (HRP) and zeolite co-immobilized on gelatin particles mixed with graphite was described.

Comparing the composite (zeolite/graphite) and the biocomposite (gelatin/HRP/zeolite/graphite) electrodes showed that the latter presented an enhancement on the electrodes diffusion properties and, apparently, the enzyme co-immobilized with zeolite on gelatin was electro-active and functioned as mediator in the electro-oxidation of phenol.

Various HRP/zeolite ratios were tested and the best result was obtained with the 1:100 m HRP /m zeo biocomposite electrode. These results confirm the existence of HRP-zeolite interactions, as previously observed in pseudo-homogeneous oxidation of phenol.

📜 SIMILAR VOLUMES

Electro-oxidation of phenol on zeolite/g
Electro-oxidation of phenol on zeolite/graphite composite electrodes: Part 3. Influence of the electrolyte and of nonelectroactive cations
✍ R.H. Carvalho; M.A.N.D.A. Lemos; F. Lemos; J.M.S. Cabral; F. Ramôa Ribeiro 📂 Article 📅 2008 🏛 Elsevier Science 🌐 English ⚖ 911 KB

On previous papers it was shown that composite electrodes, incorporating Y zeolite, in its sodium form, were able to induce the electrooxidation of phenol; it was also established that exchanging sodium by protons seriously deteriorated the electrode's ability to oxidise phenol, indicating that cati