Citation: YANG Li-Zhu, ZHU Jing, ZHANG Ren-Yi, MA Dan-Qi, HE Pin-Gang, FANG Yu-Zhi. DNA Biosensor Based on Large Area of Gold Particles on Aligned Carbon Nanotubes for Detection of Promyelocytic Leukaemia/Retinoic Acid Receptor α Fusion Gene[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(3): 391-395. doi: 10.11895/j.issn.0253-3820.150773
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A novel electrochemical DNA biosensor was fabricated based on the large area of gold particles on the aligned carbon nanotubes for the detection of promyelocytic leukaemia/retinoic acid receptor α (PML/RARα) fusion gene in acute promyelocytic leukemia. Firstly, the thiol-modified single-stranded DNA (ssDNA, probe 1) was immobilized on the gold particles sputtered on the aligned carbon nanotubes electrode by self-assembly technique. Then, amino-modified ssDNA and carboxyl-modified CdTe quantum dots (QDs) were combined to get CdTe-modified DNA probe through an amidization reaction. After hybridization with target DNA, a sandwich-type assay structure was formed. Finally, the CdTe quantum dots captured on the electrode surface were detected by differential pulse anodic stripping voltammetry. The change of peak current of Cd2+ on the electrode was found to be linear with the logarithm of target DNA concentration in the range of 1.0×10-12 mol/L to 1.0×10-8 mol/L. The Linear equation was ipa (μA)=1.626+0.132lgC (mol/L) (the correlation coefficient R was 0.996) and the detection limit was 4.0×10-13 mol/L (3σ). The fabricated DNA biosensor exhibited excellent reproducibility and stability.
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