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Adsorption and Desorption of DNA on Graphene Oxide Studied by Fluorescently Labeled Oligonucleotides
Abstract
Being the newest member of the carbon materials family, graphene possesses many unique physical properties resulting is a wide range of applications. Recently, it was discovered that graphene oxide can effectively adsorb DNA, and at the same time, it can completely quench adsorbed fluorophores. These properties make it possible to prepare DNA-based optical sensors using graphene oxide. While practical analytical applications are being demonstrated, the fundamental understanding of binding between graphene oxide and DNA in solution received relatively less attention. In this work, we report that the adsorption of 12-, 18-, 24-, and 36-mer single-stranded DNA on graphene oxide is affected by several factors. For example, shorter DNAs are adsorbed more rapidly and bind more tightly to the surface of graphene. The adsorption is favored by a lower pH and a higher ionic strength. The presence of organic solvents such as ethanol can either increase or decrease adsorption depending on the ionic strength of the solution. By adding the cDNA, close to 100% desorption of the absorbed DNA on graphene can be achieved. On the other hand, if temperature is increased, only a small percentage of DNA is desorbed. Further, the adsorbed DNA can also be exchanged by free DNA in solution. These findings are important for further understanding of the interactions between DNA and graphene and for the optimization of DNA and graphene-based devices and sensors.
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Metadata
- Authors
- Wu, M., Kempaiah, R., Huang, P.-J. J., Maheshwari, V., & Liu, J.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-02-08
- Volume
- 27
- Issue
- 6
- Pages
- 2731-2738
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2047649847
- Cited by
- 527
- References
- 48
- FWCI
- 12.46
- Type
- journal article
- Language
- en
- Open access
- closed
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