BSA-templated Pb Nanocluster as a Biocompatible Signaling Probe for Electrochemical EGFR Immunosensing

July 28, 2017

Title

BSA-templated Pb Nanocluster as a Biocompatible Signaling Probe for Electrochemical EGFR Immunosensing

Author

Mir F. Mousavi, Samaneh Mirsian, Abolhassan Noori, Hoda Ilkhani, Morteza Sarparast, Nasrin Moradi, S. Zahra Bathaie, Masoud A. Mehrgardi

Year

2016

Journal

Electroanalysis

Abstract

We report here a new electrochemical probe for the development of a sensitive, and selective sandwich-type electrochemical immunosensor for the detection of epidermal growth factor receptor (EGFR). The probe is a newly synthesized bovine serum albumin (BSA)-templated Pb nanocluster (PbNC@BSA). For fabrication of the immunosensor, we employed streptavidincoated magnetic beads (MB) as a platform for immobilization of the biotinylated primary antibody (Ab1), and utilized the PbNC@BSA conjugated to secondary antibody (Ab2) as a signaling probe. After sandwiching the target protein between Ab1 and Ab2, we dissolved PbNC@BSA into an acid, and recorded square wave anodic stripping voltammetric (SWASV) signal of the Pb ions as an analytical signal for quantification of the EGFR. The immunosensor responded linearly towards EGFR within the range of 0.4 ng/mL to 35 ng/mL, with a detection limit of 8 pg/mL. The immunosensor displayed good sensitivity, selectivity, stability, and reproducibility, and proved suitable for direct measurement of EGFR in human serum samples. Moreover, we used the as-synthesized PbNC@BSA as a fluorescence label for in vitro cell viability analysis as well as bioimaging of cancerous HeLa and non-cancerous HUVEC cells. PbNC@BSA exhibited low cytotoxicity and high biocompatibility in living cells, and was a suitable fluorescent probe for live cell imaging, with potential therapeutic applications.

Instrument

J-810

Keywords

Circular dichroism, Secondary structure, Chemical stability, Nanostructures, Materials, Biochemistry