Photon induced quantum yield regeneration of cap-exchanged CdSe/CdS quantum rods for ratiometric biosensing and cellular imaging

Nanoscale
Weili WangDejian Zhou

Abstract

Full water-dispersion of commercial hydrophobic CdSe/CdS core/shell quantum rods (QRs) was achieved by cap-exchange using a dihydrolipoic acid zwitterion ligand at a low ligand:QR molar ratio (LQMR) of 1000. However, this process almost completely quenched the QR fluorescence, greatly limiting its potential in downstream fluorescence based applications. Fortunately, we found that the QR fluorescence could be recovered by exposure to near ultra-violet to blue light radiation (e.g. 300-450 nm). These "reborn" QRs were found to be compact, bright, and stable, and were resistant to non-specific adsorption, which make them powerful fluorescent probes in broad biomedical applications. We demonstrated their potential in two model applications: first, the QRs were conjugated with His8-tagged small antibody mimetic proteins (also known as Affimers) for the sensitive detection of target proteins via a Förster resonance energy transfer (FRET) readout strategy and second, the QR surface was functionalized with biotins for targeted imaging of cancer cells.

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Citations

Jun 2, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Dewei ZhuMark T Swihart
Jan 16, 2021·Journal of the American Chemical Society·Liang DuHedi Mattoussi
May 7, 2020·ACS Applied Materials & Interfaces·Olga A GoryachevaNikolai Gaponik

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Methods Mentioned

BETA
bioluminescence
FRET
biosensing
column chromatography
dynamic light scattering
biosensor
Fluorescence
confocal microscopy
fluorescence imaging

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