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Abstract:
Recent developments in the rational design and the controlled assembly of nanoscale building blocks have resulted in functional devices such as nano-optoelectronics, novel contrast probes for molecular imaging, and nanosensors. In the present study, we designed and synthesized a hybrid nanomaterial consisting of [Ru(bpy)(3)](2+)-encapsulated silica nanoparticles (SiNPs) and gold nanoparticles (AuNPs) through peptide-bridged assembly in a controllable way. A peptide that contains recognition sequence DEVD specific for active caspase-3 cleavage was employed to bring SiNPs and AuNPs into close proximity through specific molecular recognition. A FRET system with SiNPs as energy donors and AuNPs as energy acceptors has been thus developed and applied for caspase-3 detection. A change in distance between the two building blocks resulted in a change in FRET efficiency, causing a ratiometric change in emission. Caspase-3 triggers the cleavage of the peptide links between the two nanoparticles and releases AuNPs from the nanohybrids, inducing the activation of SiNPs to the "ON" state. The fluorescence turn-on response is specific to caspase-3 and allows the detection of caspase-3 as low as 0.05 U mL(-1) (similar to 6 pM).
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ACS APPLIED MATERIALS & INTERFACES
ISSN: 1944-8244
Year: 2013
Issue: 14
Volume: 5
Page: 6494-6501
5 . 9
JCR@2013
9 . 5 0 0
JCR@2022
ESI Discipline: MATERIALS SCIENCE;
JCR Journal Grade:1
CAS Journal Grade:1
Cited Count:
WoS CC Cited Count: 47
SCOPUS Cited Count: 50
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 5
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