Hydrogel-microsphere-enhanced surface plasmon resonance for the detection of a K-ras point mutation employing peptide nucleic acid

Yasunobu Sato, Shinichi Ikegaki, Koji Suzuki, Haruma Kawaguchi

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Highly-sensitive detection of a K-ras point mutation in codon 12, frequently found in pancreatic cancer, based on DNA-carrying hydrogel microspheres as a response enhancer for surface plasmon resonance (SPR), is described. Acrylamide-based microspheres with carboxyl groups were conjugated with DNA probes. Use of the DNA-carrying microsphere in the sandwich method, that is, binding of the microspheres with target DNAs at the sensor surface, enhanced the SPR response as a combined result of increased dielectric constant by the DNA-carrying microspheres. Microspheres lead to response enhancement, as shown by a 100-fold increase in sensitivity compared to that of non-amplified DNA target hybridization. In addition, the advantage of peptide nucleic acid (PNA) in the detection of a K-ras point mutation at the sensor surface by increasing temperature and flow rate is discussed. Results illustrate that the sandwich method through DNA-carrying microspheres for a SPR sensor is a promising approach for ultrasensitive DNA detection.

Original languageEnglish
Pages (from-to)803-820
Number of pages18
JournalJournal of Biomaterials Science, Polymer Edition
Volume14
Issue number8
DOIs
Publication statusPublished - 2003

Fingerprint

Peptide Nucleic Acids
Surface Plasmon Resonance
Hydrogel
Surface plasmon resonance
Microspheres
Point Mutation
Hydrogels
DNA
Sensors
Acrylamide
DNA Probes
Pancreatic Neoplasms
Codon
Permittivity
Flow rate
Temperature

Keywords

  • Hydrogel microsphere
  • K-ras codon 12
  • Peptide nucleic acid
  • Point mutation
  • Sandwich method
  • Surface plasmon resonance

ASJC Scopus subject areas

  • Biophysics

Cite this

Hydrogel-microsphere-enhanced surface plasmon resonance for the detection of a K-ras point mutation employing peptide nucleic acid. / Sato, Yasunobu; Ikegaki, Shinichi; Suzuki, Koji; Kawaguchi, Haruma.

In: Journal of Biomaterials Science, Polymer Edition, Vol. 14, No. 8, 2003, p. 803-820.

Research output: Contribution to journalArticle

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