期刊
ANALYST
卷 138, 期 12, 页码 3490-3493出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3an00426k
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资金
- NSFC for Excellent Youth Scholars of China [21222506]
- NSFC [21175024, 41076059]
- Program for New Century Excellent Talents in University [NCET-12-0619]
A simple, cost-efficient, sensitive and selective fluorescence sensor is developed for sequence-specific recognition of duplex DNA (ds-DNA) in vitro using metal-organic framework (MOF) as the sensing platform. N,N-Bis(2-hydroxy-ethyl) dithiooxamidatocopper((II)) (H(2)dtoaCu) was chosen as the example MOF, because it strongly chemisorbs the dye-labeled probe TFO (triplex-forming oligonucleotide), and quenches fluorescence from the dye. In the presence of target ds-DNA (the PPT of HIV RNA, a 16-bp ds-DNA sequence), the TFO could interact with the major groove in ds-DNA (via Hoogsteen hydrogen bonding) to form a rigid triplex structure, resulting in fluorescence recovery. The enhanced fluorescence signal has a relationship with the ds-DNA concentration, the detection limit is as low as 1.3 nmol L-1 (S/N = 3) with good selectivity, which is lower than that based on a graphene oxide platform and electrochemical-DNA sensor.
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