期刊
ANALYTICAL CHEMISTRY
卷 90, 期 12, 页码 7139-7147出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b01931
关键词
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资金
- Ministry of Science and Technology (MOST), Taiwan [106-2113-M-002-025-MY2]
- National Natural Science Foundation of China [U1605253, 61575043]
- Innovation Team Development Plan by the Ministry of Education of China [IRT 15R10]
By taking advantage of the spectral properties of metal carbonyls, we have designed a surface-enhanced Raman spectroscopy (SERS) ratiometric assay for measuring cellfree circulating DNA (cfDNA) from Epstein-Barr virus in blood for nasopharyngeal carcinoma (NPC). This assay consists of a rhenium carbonyl (Re-CO) to serve as a DNA probe, an osmium carbonyl (Os-CO) embedded within the SERS-active substrate as an internal reference, and a streptavidin layer on the surface of the substrate. Hybridization of cfDNA with biotinylated-capture sequence leads to immobilization of cfDNA on the substrate. The binding of Re-CO via daunorubicin (DNR) to cfDNA is accompanied by an appearance of a strong symmetry stretching vibrations peak at 2113 cm(-1), which has spectral overlap with Os-CO (2025 cm(-1)). This results in an increase in the I-2113/I-2025 ratio and quantitatively correlates with cfDNA. This SERS assay can be readily used to detect cfDNA in blood samples from patients due to the intensity ratio of I-2113/I-2025 lying in a silent region (1780-2200 cm(-1)) in the SERS spectrum of the biomolecules.
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