title: Ultrasensitive Electrochemical Detection of Glycoprotein Based on Boronate Affinity Sandwich Assay and Signal Amplification with Functionalized SiO2@Au Nanocomposites.
abstract: Herein we propose a multiple signal amplification strategy designed for ultrasensitive electrochemical detection of glycoproteins. This approach introduces a new type of boronate-affinity sandwich assay (BASA), which was fabricated by using gold nanoparticles combined with reduced graphene oxide (AuNPs-GO) to modify sensing surface for accelerating electron transfer, the composite of molecularly imprinted polymer (MIP) including 4-vinylphenylboronic acid (VPBA) for specific capturing glycoproteins, and SiO2nanoparticles carried gold nanoparticles (SiO2@Au) labeled with 6-ferrocenylhexanethiol (FcHT) and 4-mercaptophenylboronic acid (MPBA) (SiO2@Au/FcHT/MPBA) as tracing tag for binding glycoprotein and generating electrochemical signal. As a sandwich-type sensing, the SiO2@Au/FcHT/MPBA was captured by glycoprotein on the surface of imprinting film for further electrochemical detection in 0.1 M PBS (pH 7.4). Using horseradish peroxidase (HRP) as a model glycoprotein, the proposed approach exhibited a wide linear range from 1 pg/mL to 100 ng/mL, with a low detection limit of 0.57 pg/mL. To the best of our knowledge, this is first report of a multiple signal amplification approach based on boronate-affinity molecularly imprinted polymer and SiO2@Au/FcHT/MPBA, exhibiting greatly enhanced sensitivity for glycoprotein detection. Furthermore, the newly constructed BASA based glycoprotein sensor demonstrated HRP detection in real sample, such as human serum, suggesting its promising prospects in clinical diagnostics.
authors.affiliation: College of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, P. R. China.
authors.forename: Min
authors.initials: M
authors.lastname: You
authors.affiliation: College of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, P. R. China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Yang
authors.affiliation: College of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, P. R. China.
authors.forename: Wanxin
authors.initials: W
authors.lastname: Tang
authors.affiliation: College of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, P. R. China.
authors.forename: Fan
authors.identifier: http://orcid.org/0000-0002-0821-6741
authors.initials: F
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Molecular Engineering, East China Normal University , 500 Dongchuan Road, Shanghai 200241, P. R. China.
authors.forename: Pin-Gang
authors.initials: PG
authors.lastname: He
mesh_terms: D015374:Biosensing Techniques; D055664:Electrochemical Techniques; D006046:Gold; D006108:Graphite; D006801:Humans; D007118:Immunoassay; D057230:Limit of Detection; D053768:Metal Nanoparticles; D053761:Nanocomposites; D012822:Silicon Dioxide
chemical_list: D006046:Gold; D012822:Silicon Dioxide; D006108:Graphite
keywords: boronate-affinity sandwich assay; electrochemical sensor; glycoproteins; multiple signal amplification; oriented surface imprinting