Journal
MATHEMATICS, SCIENCE, AND COMPUTER SCIENCE EDUCATION (MSCEIS 2016)
Volume 1848, Issue -, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4983937
Keywords
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Funding
- Penelitian Unggulan Perguruan Tinggi Program of Direktorat Jendral Pendidikan Tinggi, Kementrian Pendidikan dan Kebudayaan, Indonesia
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Electrochemical biosensors are currently being developed in order to handle various clinical problems in diagnosing infectious diseases caused by pathogenic bacteria, or viruses. On this research, voltammetric DNA biosensor using gold electrode modified by thiols with self-assembled monolayers had been developed to detect a certain sequence of Salmonella typhi DNA from blood sample of typhoid fever patient. Thiol groups of cysteamines (Cys) and aldehyde groups from glutaraldehydes (Glu) were used as a link to increase the performance of gold electrode in detecting guanine oxidation signal of hybridized S. typhi DNA and ssDNA probe. Standard calibration method was used to determine analytical parameters from the measurements. The result shown that, the detection of S. typhi DNA from blood sample of typhoid fever patient can be carried out by voltammetry using gold electrode modified by self-assembled monolayers of thiols. A characteristic oxidation potential of guanine using Au/Cys/Gluwas obtained at +0.17 until +0.20 V. Limit of detection and limit of quantification from this measurements were 1.91 mu g mL(-1) and 6.35 mu g mL(-1). The concentration of complement DNA from sample was 6.96 mu g mL(-1).
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