Abstract
We studied the electroanalytical performances of chemically-modified graphenes (CMGs) containing different defect densities and amounts of oxygen-containing groups, namely graphite oxide (GPO), graphene oxide (GO), thermally reduced graphene oxide (TR-GO) and electrochemically reduced graphene oxide (ER-GO) by comparing the sensitivity, selectivity, linearity and repeatability towards the oxidation of DNA bases. We have observed that for differential pulse voltammetric (DPV) detection of adenine and cytosine, all CMGs showed enhanced sensitivity to oxidation, while for guanine and thymine, ER-GO and TR-GO exhibited much improved sensitivity over bare glassy carbon (GC) as well as over GPO and GO. There is also significant selectivity enhancement when using GPO for adenine and TR-GO for thymine. Our results have uncovered that the differences in surface functionalities, structure and defects of various CMGs largely influence their electrochemical behaviour in detecting the oxidation of DNA bases. The findings in this report will provide a useful guide for the future development of label-free electrochemical devices for DNA analysis.
| Original language | English |
|---|---|
| Pages (from-to) | 4738-4744 |
| Number of pages | 7 |
| Journal | Analyst |
| Volume | 136 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - 2011 Nov 21 |
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All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Biochemistry
- Environmental Chemistry
- Spectroscopy
- Electrochemistry
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Chemically-modified graphenes for oxidation of DNA bases : Analytical parameters. / Goh, Madeline Shuhua; Bonanni, Alessandra; Ambrosi, Adriano; Sofer, Zdeněk; Pumera, Martin.
In: Analyst, Vol. 136, No. 22, 21.11.2011, p. 4738-4744.Research output: Contribution to journal › Article
TY - JOUR
T1 - Chemically-modified graphenes for oxidation of DNA bases
T2 - Analytical parameters
AU - Goh, Madeline Shuhua
AU - Bonanni, Alessandra
AU - Ambrosi, Adriano
AU - Sofer, Zdeněk
AU - Pumera, Martin
PY - 2011/11/21
Y1 - 2011/11/21
N2 - We studied the electroanalytical performances of chemically-modified graphenes (CMGs) containing different defect densities and amounts of oxygen-containing groups, namely graphite oxide (GPO), graphene oxide (GO), thermally reduced graphene oxide (TR-GO) and electrochemically reduced graphene oxide (ER-GO) by comparing the sensitivity, selectivity, linearity and repeatability towards the oxidation of DNA bases. We have observed that for differential pulse voltammetric (DPV) detection of adenine and cytosine, all CMGs showed enhanced sensitivity to oxidation, while for guanine and thymine, ER-GO and TR-GO exhibited much improved sensitivity over bare glassy carbon (GC) as well as over GPO and GO. There is also significant selectivity enhancement when using GPO for adenine and TR-GO for thymine. Our results have uncovered that the differences in surface functionalities, structure and defects of various CMGs largely influence their electrochemical behaviour in detecting the oxidation of DNA bases. The findings in this report will provide a useful guide for the future development of label-free electrochemical devices for DNA analysis.
AB - We studied the electroanalytical performances of chemically-modified graphenes (CMGs) containing different defect densities and amounts of oxygen-containing groups, namely graphite oxide (GPO), graphene oxide (GO), thermally reduced graphene oxide (TR-GO) and electrochemically reduced graphene oxide (ER-GO) by comparing the sensitivity, selectivity, linearity and repeatability towards the oxidation of DNA bases. We have observed that for differential pulse voltammetric (DPV) detection of adenine and cytosine, all CMGs showed enhanced sensitivity to oxidation, while for guanine and thymine, ER-GO and TR-GO exhibited much improved sensitivity over bare glassy carbon (GC) as well as over GPO and GO. There is also significant selectivity enhancement when using GPO for adenine and TR-GO for thymine. Our results have uncovered that the differences in surface functionalities, structure and defects of various CMGs largely influence their electrochemical behaviour in detecting the oxidation of DNA bases. The findings in this report will provide a useful guide for the future development of label-free electrochemical devices for DNA analysis.
UR - http://www.scopus.com/inward/record.url?scp=80054993330&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80054993330&partnerID=8YFLogxK
U2 - 10.1039/c1an15631d
DO - 10.1039/c1an15631d
M3 - Article
C2 - 21956120
AN - SCOPUS:80054993330
VL - 136
SP - 4738
EP - 4744
JO - The Analyst
JF - The Analyst
SN - 0003-2654
IS - 22
ER -