DNA bioassays based on the fluorescence 'turn off' of silver nanocluster beacon.
Luminescence
; 35(5): 702-708, 2020 Aug.
Article
em En
| MEDLINE
| ID: mdl-31926119
ABSTRACT
Recognition and quantification of oligonucleotide sequences play important roles in medical diagnosis. In this study, a new fluorescent oligonucleotide-stabilized silver nanocluster beacon (NCB) probe was designed for sensitive detection of oligonucleotide sequence targets. This probe contained two tailored DNA strands. One strand was a signal probe strand containing a cytosine-rich strand template for fluorescent silver nanocluster (Ag NC) synthesis and a detection sections at each end. The other strand was a fluorescence enhancing strand containing a guanine-rich section for signal enhancement at one end and a linker section complementary to one end of the signal probe strand. After synthesis of the Ag NCs and hybridization of the two strands, the fluorescence intensity of the as-prepared silver NCB was enhanced 200-fold compared with the Ag NCs. Two NCBs were designed to detect two disease-related oligonucleotide sequences, and results indicated that the two target oligonucleotide sequences in the range 50.0-600.0 and 50.0-200.0 nM could be linearly detected with detection limits of 20 and 25 nM, respectively. The developed fluorescence method using NCBs for oligonucleotide sequence detection was sensitive, facile and had potential for use in bioanalysis and diagnosis.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Prata
/
DNA
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Técnicas Biossensoriais
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Sondas de Oligonucleotídeos
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Nanopartículas Metálicas
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Fluorescência
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Corantes Fluorescentes
Idioma:
En
Revista:
Luminescence
Assunto da revista:
BIOFISICA
/
BIOQUIMICA
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
China