Variation of Microwave Dielectric Properties in the Glucose Biosensor System
| Autor: | Nora Salina Md. Salim, Abbas Zulkifly, Kaida Khalid, Yusoff Jumiah Hassan, Fariba Jafari |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | International Journal of Food Properties. 18:1428-1433 |
| ISSN: | 1532-2386 1094-2912 |
| DOI: | 10.1080/10942912.2011.619293 |
| Popis: | Glucose biosensor is generally based on the reaction between glucose and glucose oxidase, which produces gluconic acid and hydrogen peroxide. The gluconic acid is a conductive material, while hydrogen peroxide has polar molecules. This article examines the changes of dielectric properties due to the conductive loss below 2 GHz and dipole orientation of above that frequency of this reaction. The difference between the dielectric loss of glucose solution and the dielectric loss of glucose-enzyme reaction can be related to the glucose concentration in the samples, such as orange juice, black grape juice, sugarcane juice, and sapodilla juice. A good sensitivity to these differences due to the effect of ionic conductivity and dipole orientation was found at 1 and 16.44 GHz, respectively. The minimum detection limit of glucose concentration in the proposed technique was about 0.01 M (0.20 g/100 ml) with an optimum reaction ratio of about 1:1 between the enzyme solution and the glucose solution. This technique c... |
| Databáze: | OpenAIRE |
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