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This review (with 147 references) summarizes the state of the art in methods for signal amplification in immunoassays by using noble metal nanoparticles (MeNPs). Following an introduction into the field, a first large section covers MeNPs as signal tracers. The next sections describes the use of MeNPs as carriers for biomolecules, and of doped, decorated or functionalized MeNPs. A next large section...
The authors report on a new gold nanoparticle-based colorimetric assay for microRNA (miRNA). It is based on duplex-specific nuclease (DSN)-assisted signal amplification. Following hybridization between target miRNA and its complementary single-stranded DNA (ssDNA), the ssDNA in the DNA:RNA hybrid is selectively cleaved by DSN to produce small DNA fragments. Target microRNA is thus released and will...
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