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Journal of Biomedical Optics

Antibody-based magnetic nanoparticle immunoassay for quantification of Alzheimer’s disease pathogenic factor
Author(s): Chang-Beom Kim; Yu Yong Choi; Woo Keun Song; Ki-Bong Song
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Paper Abstract

Alzheimer’s disease (AD) is a neurodegenerative disorder that leads to a decline in cognitive and intellectual abilities and an irreversible mental deterioration. Based on multidisciplinary AD research, the most universally accepted hypotheses on AD pathogenesis are the intracerebral aggregate formation of beta-amyloid ( ) peptides. According to medical paradigmatic transition from medical treatment to early diagnostic prevention, scientists have considered physiological body fluid as a biomarker medium, in which the promising AD biomarkers could be verified. Recently, use of saliva has been considered as one of the diagnostic fluids over the past decade with meaningful diagnostic potential. We utilized saliva as a biomarker medium to correlate the salivary levels to AD pathological aspects, especially to the mild cognitive impairment group among AD patients, and to verify our detecting system to be sensitive enough for an early diagnostic tool. The identification of the salivary AD biomarkers using a facile microarraying method would motivate this study with the assistance of magnetically assembled antibody-conjugated nanoparticles and a photomultiplier tube as an optical detector. This simple magnetoimmunoassay system measures the photointensity generated by fluorescence, enables the quantification of the peptides from AD salivary samples, and consequently classifies the salivary levels into AD pathological aspects. This method demonstrates a facile approach enabling it to simply detect salivary peptides at a concentration as low as ∼20  pg/ml . It is expected that our simple magnetoimmunoassay system may have a potential as a detector for low-level peptides with weak-fluorescence emission.

Paper Details

Date Published: 2 December 2013
PDF: 8 pages
J. Biomed. Opt. 19(5) 051205 doi: 10.1117/1.JBO.19.5.051205
Published in: Journal of Biomedical Optics Volume 19, Issue 5
Show Author Affiliations
Chang-Beom Kim, Electronics and Telecommunications Research Institute (Korea, Republic of)
Yu Yong Choi, Gwangju Institute of Science and Technology (Korea, Republic of)
Woo Keun Song, Gwangju Institute of Science and Technology (Korea, Republic of)
Ki-Bong Song, Electronics and Telecommunications Research Institute (Korea, Republic of)

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