An Electrochemical DNA Biosensor for the Detection of the Apa I Polymorphism in the Vitamin D Receptor Gene Using Meldola's Blue as a Hybridization Indicator
✍ Scribed by Nilay Aladag; Dilsat Ozkan-Ariksoysal; Duygu Gezen-Ak; Selma Yilmazer; Mehmet Ozsoz
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 268 KB
- Volume
- 22
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
Abstract
Electrochemical detection of nucleic acid base mismatches related to Apa I single nucleotide polymorphism (SNP) in the vitamin D receptor gene was performed successfully using 7‐dimethyl‐amino‐1,2‐benzophenoxazinium salt (Meldola's blue, MDB) with 10.9 pmol/100 μL of detection limit. MDB reduction signals obtained from probe, mismatch(probe‐SNP containing target) and hybrid(probe‐target) modified pencil graphite electrode(PGE) increased respectively. The sensor was able to clearly distinguish perfect match from mismatch DNA in a 30 min. detection time. Several factors affecting on the hybridization and indicator response are studied to maximize sensitivity and selectivity. The advantages of the biosensor are discussed in comparison with previous electrochemical assays for DNA hybridization.