Title | ||
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Development of Fluorescent FRET Probes for "Off-On" Detection of L-Cysteine Based on Gold Nanoparticles and Porous Silicon Nanoparticles in Ethanol Solution. |
Abstract | ||
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A new type of fluorescence "off-on" probe was designed for L-Cysteine (L-Cys) based on the fluorescence resonance energy transfer (FRET) between negatively charged amino-capped porous silicon nanoparticles (SiNPs) and positively charged citrate-stabilized Au nanoparticles (AuNPs). In this proposed FRET immunosensor, novel water-soluble amino-conjugated porous SiNPs in ethanol with excellent photoluminescence properties act as the energy donor. Excellent quenching efficiency between SiNPs-ethanol and citrate-stabilized AuNPs by electrostatic interaction via FRET provides an ideal "off-state" (turn-off). The addition of L-Cys leads to releasing the adsorbed AuNPs from the surface of SiNPs and hence the fluorescence emission of SiNPs-ethanol is restored (turn-on), which means the coordination ability of the thiols with AuNPs is stronger than that of the electrostatic interaction. The fluorescence intensity of SiNPs-AuNPs in ethanol is sensitive to L-Cys, and such a restored fluorescence is proportional to the concentration of L-Cys. The method will broadly benefit the development of a new thiol biosensor based on nanostructured porous materials, and the proposed procedure is also expected to develop a variety of functional nanoparticles to form other novel kinds of nanosensors. |
Year | DOI | Venue |
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2017 | 10.3390/s17030520 | SENSORS |
Keywords | Field | DocType |
off-on fluorescence biosensor,porous SiNPs,ethanol solution,AuNPs,L-Cysteine | Nanotechnology,Analytical chemistry,Porous silicon,Nanosensor,Colloidal gold,Fluorescence,Förster resonance energy transfer,Biosensor,Engineering,Nanoparticle,Photoluminescence | Journal |
Volume | Issue | Citations |
17 | 3.0 | 0 |
PageRank | References | Authors |
0.34 | 0 | 2 |
Name | Order | Citations | PageRank |
---|---|---|---|
Hongyan Zhang | 1 | 5 | 3.74 |
Zhenhong Jia | 2 | 29 | 15.13 |