Sensitive electrochemical immunosensor for matrix metalloproteinase-3 based on single-wall carbon nanotubes.
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 microL 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.
Munge
Bernard S
BS
Salve Regina University, Department of Chemistry, Newport, Rhode Island 02840-4192, USA. bernard.munge@salve.edu
Fisher
Jacqueline
J
Millord
Lines N
LN
Krause
Colleen E
CE
Dowd
Richard S
RS
Rusling
James F
JF
D000906:Antibodies / Q000276:immunology / Q000378:metabolism; D015374:Biosensing Techniques / Q000379:methods*; D055664:Electrochemical Techniques / Q000379:methods*; D004800:Enzymes, Immobilized; D007124:Immunoenzyme Techniques / Q000379:methods*; D019278:Matrix Metalloproteinase 3 / Q000032:analysis*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D019095:Point-of-Care Systems; D011136:Polysorbates / Q000737:chemistry
D000906:Antibodies; D004800:Enzymes, Immobilized; D037742:Nanotubes, Carbon; D011136:Polysorbates; D019278:Matrix Metalloproteinase 3