Journal
TALANTA
Volume 134, Issue -, Pages 354-359Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2014.11.042
Keywords
High-performance liquid chromatography; Wall-jet/thin-layer amperometric electrochemical detector; Guanine; Adenine; Electrode-adsorption effect
Categories
Funding
- National Natural Science Foundation of China [21175042, 21475041]
- Hunan Lotus Scholars Program
- Foundations of Hunan Provincial Education and Science/Technology Department
- State Key Laboratories of Chemo/Biosensing and Chemometrics
- Electroanalytical Chemistry
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A sensitive wall-jet/thin-layer amperometric electrochemical detector (ECD) coupled to high-performance liquid chromatography (HPLC) was developed for simultaneous determination of guanine (G) and adenine (A). The analytes were detected at a glassy carbon electrode (GCE) and the HPLC-ECD calibration curves showed good linearity (R-2 > 0.997) under optimized conditions. Limits of detection for G and A are 0.6 nM and 1.4 nM (S/N=3), respectively, which are lower than those obtained with an UV-vis detector and a commercial electrochemical detector. We have successfully applied this HPLC-ECD to assess the contents of G and A in hydrochloric acid-digested calf thymus double-stranded DNA. In addition, we compared in detail the analysis of G and A by cyclic voltammetry (CV) and by the HPLC-ECD system on both bare GCE and electroreduced graphene oxide (ERGO) modified GCE. We found that the adsorption of G and A on the electrode surfaces can vary their anodic CV peaks and the competitive adsorption of G and A on the limited sites of the electrode surfaces can cause crosstalk effects on their anodic CV peak signals, but the HPLC-ECD system is insensitive to such electrode-adsorption and can give more reliable analytical results. (C) 2014 Elsevier B.V. All rights reserved.
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