Issue 6, 2010

Sensitive electrochemical immunosensor for matrix metalloproteinase-3 based on single-wall carbon nanotubes

Abstract

A novel electrochemical immunosensor for the detection of matrix metalloproteinase-3 (MMP-3), a cancer biomarker protein, based on vertically aligned single-wall carbon nanotube (SWCNT) arrays is presented. Detection was based on a sandwich immunoassay consisting of horseradish peroxidase (14–16 labels) conjugated to a secondary antibody and/or a polymer bead loaded with multi-enzyme labels. Performance was optimized by effective minimization of non-specific binding (NSB) events using Bovine serum albumin (BSA), Tween-20 and optimization of the primary antibody and secondary antibody concentrations. Results provided a detection limit of 0.4 ng mL−1 (7.7 pM) for the 14–16 label sensor protocol and 4 pg mL−1 (77 fM) using a multiply enzyme labeled polymeric bead amplification strategy in 10 µL of calf serum. This immunosensor based on SWCNT arrays offers great promise for a rapid, simple, cost-effective method for clinical screening of cancer biomarkers for point-of-care diagnosis.

Graphical abstract: Sensitive electrochemical immunosensor for matrix metalloproteinase-3 based on single-wall carbon nanotubes

Supplementary files

Article information

Article type
Paper
Submitted
22 Jan 2010
Accepted
13 Mar 2010
First published
31 Mar 2010

Analyst, 2010,135, 1345-1350

Sensitive electrochemical immunosensor for matrix metalloproteinase-3 based on single-wall carbon nanotubes

B. S. Munge, J. Fisher, L. N. Millord, C. E. Krause, R. S. Dowd and J. F. Rusling, Analyst, 2010, 135, 1345 DOI: 10.1039/C0AN00028K

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