29 Result(s)
within
Hongyan **g
Chemistry
Characterization and Evaluation of Materials
Nanotechnology
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Article
Sulfonic acid functionalized monolithic column for high selectivity capillary electrochromatography separation
A new nano-scale spherical vinyl-functionalized covalent organic polymer (TAPT-DVA-COP) with uniform sizes around 300 nm was initially constructed using 2,5-divinyl-1,4-benzaldehyde (DVA) and 2,4,6-tris(4-amin...
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Article
Mn2+-modified black phosphorus nanosensor for detection of exosomal microRNAs and exosomes
The development and performance of a DNA probe adsorbing Mn2+-modified black phosphorus (BP@Mn2+/DNA) hybrid nanosensor is reported that enables rapid detection of cancer-derived exosomal microRNAs (miRNAs) and e...
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Article
Preparation of fluorescein-modified polymer dots and their application in chiral discrimination of lysine enantiomers
Fluorescein-functionalized fluorescent polymer dots (F-PDs) were prepared by a facile one-pot method by magnetic stirring under mild conditions based on carboxymethylcellulose (CMC) and fluorescein as the prec...
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Article
SERS- and absorbance-based catalytic assay for determination of isocarbophos using aptamer-modified FeMOF nanozyme and in situ generated silver nanoparticles
A new Fe metal–organic framework-loaded liquid crystal 4-octoxybenzoic acid (FeMOF@OCTB) nanosol was synthesized using 1,3,5-phthalic acid, ferrous sulfate, and OCTB as precursors. The FeMOF@OCTB exhibits good...
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Article
A sensitive multimode dot-filtration strip for the detection of Salmonella typhimurium using MoS2@Fe3O4
A sensitive, accurate, and rapid multimode dot-filtration immunoassay (MDFIA) was established for the detection of Salmonella typhimurium using the intrinsic color, catalytic property, and photothermal effect of ...
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Article
Photothermal card reader assay using the commercial colloidal gold test strip for the rapid quantitative detection of food hazards
The simple and rapid commercial colloidal gold test strip can only be used for qualitative or semi-quantitative detection, accompanied by weak detectability and false negative experimental results. Herein, a p...
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Article
Colorimetric determination of cysteine based on Au@Pt nanoparticles as oxidase mimetics with enhanced selectivity
A H2O2-free colorimetric protocol based on urchin-like Au@Pt nanoparticles (Au@Pt NPs) has been developed for the sensitive and selective determination of cysteine (Cys). We verified the intrinsic oxidase-like ac...
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Article
Salmonella typhimurium detector based on the intrinsic peroxidase-like activity and photothermal effect of MoS2
A multimode dot-filtration immunoassay (MDFIA) was established for rapid and accurate detection of the target (Salmonella typhimurium), which was based on the intrinsic color, peroxidase-like activity and photot...
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Article
Ratiometric persistent luminescence aptasensors for carcinoembryonic antigen detection
NIR-emitted ZnGa2O4:Cr3+ persistent luminescence nanoparticles (ZGC NPs) coated with polydopamine (ZGC@PDA NPs) were designed featuring internal reference and quenching ability. Sr-doped Zn2GeO4 persistent lumine...
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Article
A sensitive method to determine dopamine in the presence of uric acid based on In2O3 nanosheet arrays grown on 3D graphene
A nonenzymatic voltammetric assay for dopamine (DA) was developed based on the combination of three-dimensional graphene (3D Gr) and indium oxide nanosheet arrays (In2O3 NSAs). 3D Gr was prepared by chemical vapo...
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Article
Electrochemiluminescent determination of the activity of uracil-DNA glycosylase: Combining nicking enzyme assisted signal amplification and catalyzed hairpin assembly
An electrochemiluminescence (ECL) based method is described for the determination of the activity of the enzyme uracil-DNA glycosylase (UDG). It is based on the use of nicking enzyme-assisted signal amplificat...
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Article
Multiplexed determination of intracellular messenger RNA by using a graphene oxide nanoprobe modified with target-recognizing fluorescent oligonucleotides
A multiplexed graphene oxide (GO) fluorescent nanoprobe is described for quantification and imaging of messenger RNAs (mRNAs) in living cells. The recognizing oligonucleotides (with sequences complementary to ...
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Article
Identification of pathogenic bacteria in human blood using IgG-modified Fe3O4 magnetic beads as a sorbent and MALDI-TOF MS for profiling
A method is described for fast identification of bacteria by combining (a) the enrichment of bacterial cells by using magnetite (Fe3O4) magnetic beads modified with human IgG (IgG@Fe3O4) and (b) MALDI-TOF MS anal...
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Article
3-Dimensional hollow graphene balls for voltammetric sensing of levodopa in the presence of uric acid
The development of novel nanomaterials brings new opportunity and challenge for high sensing detection of biomolecules. The authors describe the preparation of 3-dimentional hollow graphene balls (3D HGBs) usi...
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Article
Determination of nickel(II) at nanomolar levels using iodide-responsive gold-copper nanoparticles as colorimetric probes
The authors present a colorimetric method for the quantification of Ni(II) at nanomolar levels. It is based on the use of iodide-responsive copper-gold nanoparticles (Cu-Au NPs) combined with the Ni(II)-cataly...
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Article
Visual detection of ultra-trace levels of uranyl ions using magnetic bead-based DNAzyme recognition in combination with rolling circle amplification
The authors describe a colorimetric method for the determination of ultra-trace levels of uranyl ion (UO2 2+) in beverage and milk. It employs (a) DNAzyme-functionalized magnetic beads (MB...
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Article
A turn-on fluorescent lysine nanoprobe based on the use of the Alizarin Red aluminum(III) complex conjugated to graphene oxide, and its application to cellular imaging of lysine
The authors describe a rationally designed nanoprobe for the fluorometric determination of lysine. It is based on a ternary complex consisting of graphene oxide, aluminum ions (acting as a bridging agent), and...
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Article
A nanocomposite consisting of graphene oxide and Fe3O4 magnetic nanoparticles for the extraction of flavonoids from tea, wine and urine samples
We describe a single-step solvothermal method for the preparation of nanocomposites consisting of graphene oxide and Fe3O4 nanoparticles (GO/Fe3O4). This material is shown to be useful as a magnetic sorbent for t...
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Article
Non-enzymatic sensing of uric acid using a carbon nanotube ionic-liquid paste electrode modified with poly(β-cyclodextrin)
We describe a nonenzymatic electrochemical sensor for uric acid. It is based on a carbon nanotube ionic-liquid paste electrode modified with poly(β-cyclodextrin) that was prepared in-situ by electropolymerizat...
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Article
Sensing epinephrine with an ITO electrode modified with an imprinted chitosan film containing multi-walled carbon nanotubes and a polymerized ionic liquid
We report on a sensor for epinephrine (EP) that is based on an ITO electrode modified with multi-walled carbon nanotubes pre-coated with a polymerized ionic liquid (PIL-MWNTs). A chitosan film was then electro...
