Artigo Revisado por pares

Electrochemical aptasensor for mucin 1 based on dual signal amplification of poly(o-phenylenediamine) carrier and functionalized carbon nanotubes tracing tag

2014; Elsevier BV; Volume: 64; Linguagem: Inglês

10.1016/j.bios.2014.09.052

ISSN

1873-4235

Autores

Xiaojun Chen, Qi Zhang, Chunhua Qian, Ning Hao, Lin Xu, Cheng Yao,

Tópico(s)

Supramolecular Self-Assembly in Materials

Resumo

Mucin 1 (MUC 1), as a most studied mucin, has become a useful marker for identifying breast cancer in the early stages. In this work, a novel method for the determination of MUC 1 in serum was developed based on a sandwich-type electrochemical aptasensor, which combined a dual signal amplification strategy of poly(o-phenylenediamine)–Au nanoparticles (PoPD–AuNPs) hybrid film as carrier and AuNPs functionalized silica/multiwalled carbon nanotubes core–shell nanocomposites (AuNPs/SiO2@MWCNTs) as tracing tag. The PoPD–AuNPs film provides a suitable microenvironment for stabilizing the primary aptamer (Apt) assembly, and the AuNPs/SiO2@MWCNTs enhances the surface area for immobilizing abundant secondary Apts as well as load large amounts of electrochemical probe thionine (Thi). In the presence of MUC 1, the sandwich-type recognition reacted on the aptasensor surface, and the Thi-AuNPs/SiO2@MWCNTs nanoprobes were captured onto the electrode surface to form biocomplex. AuNPs and MWCNTs could facilitate the electron transfer from Thi to the electrode, thus amplifying the detection response. Under the optimized experimental conditions, the proposed sensing strategy provided a wider linear dynamic range over three orders of magnitude with the detection limit down to 1 pM. Moreover, the aptasensor demonstrated good precision, acceptable stability and reproducibility.

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