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A sensitive and stable bioassay for the detection of Aβ oligomer (Aβo), a potentially promising candidate biomarker for Alzheimer's disease (AD) diagnosis, was developed using Fe3O4 magnetic nanoparticles (MNPs) as the recognition and concentration elements and BaYF5:Yb,Er upconversion nanoparticles (UCNPs) as highly sensitive labels, conjugated with the Aβo aptamer (DNA1) and the complementary oligonucleotide...
A new highly sensitive colorimetric receptor 1 for fluoride based on anthracene-9,10-dicarbaldehyde bis-p-nitrophenylhydrazone was designed, synthesized and characterized. Experiments showed that the receptor 1 can selectively recognize the fluoride in DMSO and even in 95/5 DMSO/H 2 O (v/v) mixtures. The ability of recognition and the bond between receptor 1 and anions were determined using...
A novel positive homotropic allosteric system 1 based on 3-methylpyrozole-5-one-4-one-2′,4′-dinitrophenylhydrazone was designed, synthesized and characterized. Colorimetric and fluorescent sensing of anions was achieved in physiological condition (pH 7.4), resulting from the positive homotropic allosterism of 1 induced by anions tested. In particular, the compound 1 exhibited a two-step response to...
A simple colorimetric and ratiometric fluorescent anion sensor 1, 3,6-dichloro-1,8-dinitrocarbazole, was rationally designed and synthesized on basis of the mechanism of intramolecular charge transfer (ICT). In DMSO solutions of 1, the presence of AcO − , F − and H 2 PO 4− gave birth to the formation of a 2:1 host-to-guest complex, which was synchronously accompanied...
An efficient colorimetric sensor with a thiourea moiety as binding sites and p-nitrophenylhydrazine as a signaling unit has been synthesized by only one single-step procedure. Selectivity for anions with the distinct geometry (tetrahedral, trigonal planar and spherical) has been investigated in dry DMSO and even in DMSO/H 2 O (95:5, v/v) solutions through the naked-eye experiment, UV–vis titration...
A new and simple phenylhydrazone-based sensor 1 for acetate has been investigated in DMSO and even in the 95:5 DMSO/H 2 O (v/v) mixtures. Binding of anions such as AcO − , F − and H 2 PO 4− results in a noteworthy change in the visible region of spectrum (approximately 100nm red shift), which can be detected by the ‘naked-eye’. The further insights to the...
A novel phenylhydrazone-based indole anion receptor is synthesized by a simple method, and the receptor binds acetate anions with good selectivity in DMSO solution, which is related to the structure of the receptor matching with the anion. The binding properties of the host are examined by UV–vis changes. The color changes of the host upon the addition of a variety of structurally different anions...
Two novel artificial receptors based on diamide and bearing phenol group and copper(II) have been synthesized. Their anion-binding properties are evaluated for F − , Cl − , Br − , I − , AcO − , H 2 PO 4− and OH − by UV–vis and 1 H NMR titration experiments to further elucidate the impact of phenol group and copper(II) on...
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