Highly sensitive electrochemical immunoassay integrated with polymeric nanocomposites and enhanced SiO2@Au core-shell nanobioprobes for SirT1 determination

- A novel signal enhancement strategy was designed for electrochemical immunoassay.
- PAMAM-Au-MWCNT nanocomposites serve as an ideal sensing platform.
- Core-shell SiO2@Au serves as tracing tags to immobilize HRP-Ab2 as nanobioprobes.
- The immunosensor was successfully applied to evaluate SirT1 expression in cells samples.

An ultra-highly sensitive electrochemical immunosensor for SirT1 (a key protein in age-related diseases) evaluation has been designed, employing polymeric nanocomposites as sensing platform and core-shell SiO2@Au to immobilize HRP-Ab2 as nanobioprobes. The approach includes chemical synthesis of PAMAM-Au-MWCNT nanocomposites (PNCs) with abundant PAMAM-Au nanoparticles immobilized on the MWCNT matrix, and biochemically synthesis of nanobioprobes with highly dispersed SiO2@Au tracing tags for successive efficient load functionalized enzyme-antibodies (HRP-Ab2). The PNCs nanocomposites could improve the efficiency of immune response via abundant capture antibodies (Ab1#1) on the electrode surface, and accelerate electron transfer through MWCNT and Au nanoparticles. Besides, the SiO2@Au was employed as tracing tags to label numerous HRP-Ab2 to further enhance signal readout during HRP−thionine−H2O2 system. Under optimal conditions, the signal intensity was linearly related to the concentration of SirT1 in the range of 20 pg mL-1 to 500 ng ml-1, and the limit of detection was 12.5 pg mL-1. It is noteworthy that the proposed immunoassay protocol has been successfully applied to evaluate SirT1 expression in cells by different treatment with high sensitivity and accuracy.

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