Electrochemical glycoprotein aptasensors based on the in-situ aggregation of silver nanoparticles induced by 4-mercaptophenylboronic acid
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The authors report on an amperometric method for the determination of glycoprotein by using an aptamer as the bioreceptor. The detection scheme is making use of aggregated citrate-capped silver nanoparticles (AgNPs) on a gold electrode. Aggregation is accomplished by addition of 4-mercaptophenylboronic acid (MPBA) which acts as a cross-linker due to the formation of Ag-S bonds and of boronate esters. A thiolated DNA aptamer was then attached to the electrode in order to capture glycoprotein. Once captured, the glycoprotein reacts with MPBA through the formation of boronate esters. The electrochemical signal is thus amplified by the formation of a network of AgNPs which act as redox reporters. To demonstrate the feasibility of the method, prostate specific antigen (PSA) was chosen as a model analyte. The detection limit for PSA is as low as 0.2 pg mL−1. In our preception, this method provides a powerful tool for studying the glycan function in biological and physiological processes.
KeywordsElectrochemical biosensor Glycoprotein Silver nanoparticles Boronic acid Prostate specific antigen Aptamer Signal amplification Boronate esters
We acknowledge financial support of the National Natural Science Foundation of China (21205003, 21305004), the Joint Fund for Fostering Talents of National Natural Science Foundation of China and Henan Province (U1304205), the Program for Science and Technology Innovation Talents at the University of Henan Province (18HASTIT005) and the Science & Technology Foundation of Henan Province (17A150001).
Compliance with ethical standards
The authors declare that they have no competing interests.
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