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

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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.

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Acknowledgements

Support of this research by the National Science Council (Republic of China), Buddhist Dalin Tzu Chi General Hospital, and National Chung Cheng University through grant no. NSC 92-2320-B-320-024 is acknowledged.

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Authors and Affiliations

  1. Department of Internal Medicine, Buddhist Dalin Tzu Chi General Hospital, Dalin Town, Chia-Yi, 622, Taiwan

    Ning-Sheng Lai & Hui-Ling Chiang

  2. Department of Chemistry and Biochemistry, National Chung Cheng University, Ming-Hsiung, Chia-Yi, 621, Taiwan

    Chun-Chien Wang & Lai-Kwan Chau

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  1. Ning-Sheng Lai
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  2. Chun-Chien Wang
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  3. Hui-Ling Chiang
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  4. Lai-Kwan Chau
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Correspondence to Lai-Kwan Chau.

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Lai, NS., Wang, CC., Chiang, HL. et al. Detection of antinuclear antibodies by a colloidal gold modified optical fiber: comparison with ELISA. Anal Bioanal Chem 388, 901–907 (2007). https://doi.org/10.1007/s00216-007-1276-1

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  • DOI: https://doi.org/10.1007/s00216-007-1276-1

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