A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase
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2013
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my.unimap-239822013-06-24T04:47:16Z A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase Syed Muhammad, Usman Ali, Dr. Zafar Hussain, Ibupoto Muhammad, Kashif Uda, Hashim, Prof. Dr. Willander, Magnus syeal@itn.liu.se zafar.hussain.ibupoto@liu.se kashif_bme@yahoo.com uda@unimap.edu.my magwi@itn.liu.se ZnO nanoflakes (ZnO-NFs) Potentiometric nanosensor Uricase Nafion® membrane Link to publisher's homepage at http://www.mdpi.com/ In the present work zinc oxide nanoflakes (ZnO-NF) structures with a wall thickness around 50 to 100 nm were synthesized on a gold coated glass substrate using a low temperature hydrothermal method. The enzyme uricase was electrostatically immobilized in conjunction with Nafion membrane on the surface of well oriented ZnO-NFs, resulting in a sensitive, selective, stable and reproducible uric acid sensor. The electrochemical response of the ZnO-NF-based sensor vs. a Ag/AgCl reference electrode was found to be linear over a relatively wide logarithmic concentration range (500 nM to 1.5 mM). In addition, the ZnO-NF structures demonstrate vast surface area that allow high enzyme loading which results provided a higher sensitivity. The proposed ZnO-NF array-based sensor exhibited a high sensitivity of ~66 mV/ decade in test electrolyte solutions of uric acid, with fast response time. The sensor response was unaffected by normal concentrations of common interferents such as ascorbic acid, glucose, and urea. 2013-03-07T07:51:44Z 2013-03-07T07:51:44Z 2012-03 Article Sensors, vol. 12(3), 2012, pages 2787-2797 1424-8220 http://www.mdpi.com/1424-8220/12/3/2787 http://hdl.handle.net/123456789/23982 en MDPI |
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English |
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ZnO nanoflakes (ZnO-NFs) Potentiometric nanosensor Uricase Nafion® membrane |
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ZnO nanoflakes (ZnO-NFs) Potentiometric nanosensor Uricase Nafion® membrane Syed Muhammad, Usman Ali, Dr. Zafar Hussain, Ibupoto Muhammad, Kashif Uda, Hashim, Prof. Dr. Willander, Magnus A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase |
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Link to publisher's homepage at http://www.mdpi.com/ |
| author2 |
syeal@itn.liu.se |
| author_facet |
syeal@itn.liu.se Syed Muhammad, Usman Ali, Dr. Zafar Hussain, Ibupoto Muhammad, Kashif Uda, Hashim, Prof. Dr. Willander, Magnus |
| format |
Article |
| author |
Syed Muhammad, Usman Ali, Dr. Zafar Hussain, Ibupoto Muhammad, Kashif Uda, Hashim, Prof. Dr. Willander, Magnus |
| author_sort |
Syed Muhammad, Usman Ali, Dr. |
| title |
A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase |
| title_short |
A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase |
| title_full |
A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase |
| title_fullStr |
A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase |
| title_full_unstemmed |
A potentiometric indirect uric acid sensor based on ZnO nanoflakes and immobilized uricase |
| title_sort |
potentiometric indirect uric acid sensor based on zno nanoflakes and immobilized uricase |
| publisher |
MDPI |
| publishDate |
2013 |
| url |
http://dspace.unimap.edu.my/xmlui/handle/123456789/23982 |
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