期刊
JOURNAL OF IMMUNOLOGICAL METHODS
卷 366, 期 1-2, 页码 1-7出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jim.2010.12.002
关键词
Metal-Enhanced Fluorescence; Surface enhanced fluorescence; Plasmon enhanced fluorescence; Plasmon controlled fluorescence; DNA assays; Point-of-Care diagnostics
资金
- PHS HHS [2U54 AIO57168-07] Funding Source: Medline
For analyses of DNA fragment sequences in solution we introduce a 2-color DNA assay, utilizing a combination of the Metal-Enhanced Fluorescence (MEF) effect and microwave-accelerated DNA hybridization. The assay is based on a new Catch and Signal technology, i.e. the simultaneous specific recognition of two target DNA sequences in one well by complementary anchor-ssDNAs, attached to silver island films (SiFs). It is shown that fluorescent labels (Alexa 488 and Alexa 594), covalently attached to ssDNA fragments, play the role of biosensor recognition probes, demonstrating strong response upon DNA hybridization, locating fluorophores in close proximity to silver NPs, which is ideal for MEF. Subsequently the emission dramatically increases, while the excited state lifetime decreases. It is also shown that 30s microwave irradiation of wells, containing DNA molecules, considerably (-1000-fold) speeds up the highly selective hybridization of DNA fragments at ambient temperature. The 2-color Catch and Signal DNA assay platform can radically expedite quantitative analysis of genome DNA sequences, creating a simple and fast bio-medical platform for nucleic acid analysis. (C) 2010 Elsevier B.V. All rights reserved.
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