Highly Sensitive Immunoassay of Lung Cancer Marker Carcinoembryonic Antigen Using Surface-Enhanced Raman Scattering of Hollow Gold Nanospheres

A quick and reproducible surface-enhanced Raman scattering (SERS)-based immunoassay technique, using hollow gold nanospheres (HGNs) and magnetic beads, has been developed. Here, HGNs show strong enhancement effects from individual particles because hot spots can be localized on the pinholes in the h...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2009-04, Vol.81 (8), p.3029-3034
Main Authors: Chon, Hyangah, Lee, Sangyeop, Son, Sang Wook, Oh, Chil Hwan, Choo, Jaebum
Format: Article
Language:English
Subjects:
Analytical chemistry
Antigens
Biological and medical sciences
Biomarkers, Tumor - analysis
Carcinoembryonic Antigen - analysis
Chemistry
Colorimetry
Enzyme-Linked Immunosorbent Assay
Exact sciences and technology
Feasibility Studies
Gold
Gold - chemistry
Immunoassay
Immunoassay - methods
Immunology
Lung cancer
Lung Neoplasms - immunology
Lung Neoplasms - metabolism
Medical sciences
Metal Nanoparticles - chemistry
Microspheres
Miscellaneous
Oncology
Pneumology
Reproducibility of Results
Scattering
Sensitivity and Specificity
Spectrum Analysis, Raman - methods
Surface Properties
Time Factors
Tumors of the respiratory system and mediastinum
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Summary:A quick and reproducible surface-enhanced Raman scattering (SERS)-based immunoassay technique, using hollow gold nanospheres (HGNs) and magnetic beads, has been developed. Here, HGNs show strong enhancement effects from individual particles because hot spots can be localized on the pinholes in the hollow particle structure. Thus, HGNs can be used for highly reproducible immunoanalysis of cancer markers. Magnetic beads were used as supporting substrates for the formation of the immunocomplex. This SERS-based immunoassay technique overcomes the problem of slow immunoreaction caused by the diffusion-limited kinetics on a solid substrate because all of the reactions occur in solution. For the validation of our SERS immunoassay, a well-known lung cancer marker, carcinoembryonic antigen (CEA), was used as a target marker. According to our experimental results, the limit of detection (LOD) was determined to be 1−10 pg/mL, this value being about 100−1000 times more sensitive than the LOD of enzyme-linked immunosorbent assay. Furthermore, the assay time took less than 1 h, including washing and optical detection steps.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac802722c