Journal
ANALYTICAL CHEMISTRY
Volume 86, Issue 15, Pages 7337-7342Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac500054x
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Funding
- National Natural Science Foundation of China [21175155]
- Hunan Provincial Innovation Foundation for Postgraduate
- National Basic Research Program of China (973 Program) [2012CB932600]
- 100-talent project from Chinese Academy of Sciences
- Shanghai Pujiang Project [13PJ1410700]
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The high occurrence of prostate cancer in men makes the prostate-specific antigen (PSA) screening test really important. More importantly, the recurrence rate after radical prostatectomy is high, whereas the traditional P SA immunoassay does not possess the sufficient high sensitivity for post-treatment PSA detection. In these assays, uncontrolled and random orientation of capture antibodies on the surface largely reduces their activity. Here, by exploiting the rapidly emerging DNA nanotechnology, we developed a DNA nanostructure based scaffold to precisely control the assembly of antibody monolayer. We demonstrated that the detection sensitivity was critically dependent on the nanoscale-spacing (nanospacing) of immobilized antibodies. In addition to the controlled assembly, we further amplified the sensing signal by using the gold nanoparticles, resulting in extremely high sensitivity and a low detection limit of 1 pg/mL. To test the real-world applicability of our nanoengineered electrochemical sensor, we evaluated the performance with 11 patients' serum samples and obtained consistent results with the gold-standard assays.
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