Covalent cucurbit[7]uril-dye conjugates for sensing in aqueous saline media and biofluids.
Covalent cucurbit[7]uril-dye conjugates for sensing in aqueous saline media and biofluids.
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DOI:
10.1039/d0sc03079a
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发表时间:
2020-09-22
期刊:
影响因子:
8.4
通讯作者:
Biedermann F
中科院分区:
文献类型:
--
作者:
Hu C;Grimm L;Prabodh A;Baksi A;Siennicka A;Levkin PA;Kappes MM;Biedermann F
Non-covalent chemosensing ensembles of cucurbit[n]urils (CBn) have been widely used in proof-of-concept sensing applications, but they are prone to disintegrate in saline media, e.g. biological fluids. We show here that covalent cucurbit[7]uril–indicator dye conjugates are buffer- (10× PBS buffer) and saline-stable (up to 1.4 M NaCl) and allow for selective sensing of Parkinson's drug amantadine in human urine and saliva, where the analogous non-covalent CB7⊃dye complex is dysfunctional. The in-depth analysis of the covalent host–dye conjugates in the gas-phase, and deionized versus saline aqueous media revealed interesting structural, thermodynamic and kinetic effects that are of general interest for the design of CBn-based supramolecular chemosensors and systems. This work also introduces a novel high-affinity indicator dye for CB7 through which fundamental limitations of indicator displacement assays (IDA) were exposed, namely an impractical slow equilibration time. Unlike non-covalent CBn⊃dye reporter pairs, the conjugate chemosensors can also operate through a SN2-type guest–dye exchange mechanism, which shortens assay times and opens new avenues for tailoring analyte-selectivity. Unimolecular chemosensor shows superior stability and detection capabilities in biofluids compared to bimolecular reporter pairs.
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影响因子:
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