A hemicyanine-embedded diphenylselenide-containing probe “HemiSe” in which SePh2 stays reduced for selective detection of superoxide in living cells

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A simple one‐step synthesis of fluorescent probe HemiSe has been developed for the detection of superoxide (O2.−). The probe undergoes reaction specifically with O2.− when in the presence of other competitive ROS/RNS/metal ions. The diphenylselenide was incorporated to completely quench the fluorescence of the hemicyanine unit through the action of a photoinduced electron transfer (PET) photomechanism. However, after the addition of O2.−, the latent fluorophore regains its fluorescence owing to the reaction at the C=C bond of the hemicyanine with O2.− through nucleophilic attack; the increase in blue emission is due to a reaction of the double bond within HemiSe followed by an increase in fluorescence quantum yield (Φ) up to 0.45; the limit of detection (LOD) is 11.9 nm. A time‐dependent study shows that HemiSe can detect superoxide within 13 min with high sensitivity, high selectivity, over a wide pH range, and through confirmation with a xanthine/xanthine oxidase biochemical assay (λem=439 nm). A study in the RAW 264.7 macrophage living cells also shows that HemiSe is not toxic, cell permeable (experimental log P=2.11); confocal imaging results show that HemiSe can detect O2.− in endogenous and exogeneous systems.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2018-11
Language
English
Article Type
Article
Citation

CHEMISTRY-AN ASIAN JOURNAL, v.13, no.24, pp.3895 - 3902

ISSN
1861-4728
DOI
10.1002/asia.201801339
URI
http://hdl.handle.net/10203/250020
Appears in Collection
CH-Journal Papers(저널논문)
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