Method for fabrication and verification of conjugated nanoparticle-antibody tuning elements for multiplexed electrochemical biosensors

Jeffrey LaBelle, Aaron Fairchild, Ugur K. Demirok, Aman Verma

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

There is a critical need for more accurate, highly sensitive and specific assay for disease diagnosis and management. A novel, multiplexed, single sensor using rapid and label free electrochemical impedance spectroscopy tuning method has been developed. The key challenges while monitoring multiple targets is frequency overlap. Here we describe the methods to circumvent the overlap, tune by use of nanoparticle (NP) and discuss the various fabrication and characterization methods to develop this technique. First sensors were fabricated using printed circuit board (PCB) technology and nickel and gold layers were electrodeposited onto the PCB sensors. An off-chip conjugation of gold NP's to molecular recognition elements (with verification technique) is described as well. A standard covalent immobilization of the molecular recognition elements is also discussed with quality control techniques. Finally use and verification of sensitivity and specificity is also presented. By use of gold NP's of various sizes, we have demonstrated the possibility and shown little loss of sensitivity and specificity in the molecular recognition of inflammatory markers as "model" targets for our tuning system. By selection of other sized NP's or NP's of various materials, the tuning effect can be further exploited. The novel platform technology developed could be utilized in critical care, clinical management and at home health and disease management.

Original languageEnglish (US)
Pages (from-to)39-51
Number of pages13
JournalMethods
Volume61
Issue number1
DOIs
StatePublished - May 15 2013

Fingerprint

Molecular recognition
Biosensing Techniques
Biosensors
Gold
Nanoparticles
Tuning
Disease Management
Fabrication
Printed circuit boards
Antibodies
Sensors
Technology
Dielectric Spectroscopy
Sensitivity and Specificity
Critical Care
Nickel
Electrochemical impedance spectroscopy
Immobilization
Quality Control
Quality control

Keywords

  • Biosensor
  • Disease monitoring
  • Electrochemical impedance spectroscopy
  • Health management

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Method for fabrication and verification of conjugated nanoparticle-antibody tuning elements for multiplexed electrochemical biosensors. / LaBelle, Jeffrey; Fairchild, Aaron; Demirok, Ugur K.; Verma, Aman.

In: Methods, Vol. 61, No. 1, 15.05.2013, p. 39-51.

Research output: Contribution to journalArticle

LaBelle, Jeffrey ; Fairchild, Aaron ; Demirok, Ugur K. ; Verma, Aman. / Method for fabrication and verification of conjugated nanoparticle-antibody tuning elements for multiplexed electrochemical biosensors. In: Methods. 2013 ; Vol. 61, No. 1. pp. 39-51.
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