Analytical and Bioanalytical Chemistry

, Volume 388, Issue 4, pp 901–907

Detection of antinuclear antibodies by a colloidal gold modified optical fiber: comparison with ELISA

  • Ning-Sheng Lai
  • Chun-Chien Wang
  • Hui-Ling Chiang
  • Lai-Kwan Chau
Original Paper

DOI: 10.1007/s00216-007-1276-1

Cite this article as:
Lai, NS., Wang, CC., Chiang, HL. et al. Anal Bioanal Chem (2007) 388: 901. doi:10.1007/s00216-007-1276-1

Abstract

A fiberoptic evanescent-wave sensor has been developed for the measurement of antinuclear antibodies in sera from patients and healthy individuals. The sensor was constructed on the basis of modification of the unclad portion of an optical fiber with self-assembled gold colloids, where the colloidal gold surface was further functionalized with extractable nuclear antigens. Results show that detection of antinuclear antibodies by this sensor agrees quantitatively with the clinically accepted enzyme-linked immunosorbent assay (ELISA) method. This sensing platform has the following advantages: label-free and real-time detection capability, simple to construct and use, highly sensitive, and does not require a secondary antibody. The sensitivity of this platform is at least an order of magnitude higher than that of the ELISA method and thus may lead to a new direction in recognition of immune response.

Biomolecular binding of antinuclear antibodies (ANA) with extractable nuclear antigens (ENA)-functionalized gold nanoparticles results in a change of surface plasmon absorption. When light propagates in an optical fiber by multiple total internal reflection, such a change in signal can be significantly enhanced.

Keywords

Antinuclear antibodies Fiberoptic biosensor Localized surface plasmon resonance Gold nanoparticles Enzyme-linked immunosorbent assay 

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Ning-Sheng Lai
    • 1
  • Chun-Chien Wang
    • 2
  • Hui-Ling Chiang
    • 1
  • Lai-Kwan Chau
    • 2
  1. 1.Department of Internal Medicine, Buddhist Dalin Tzu Chi General HospitalChia-YiTaiwan
  2. 2.Department of Chemistry and BiochemistryNational Chung Cheng UniversityChia-YiTaiwan

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