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In this work, a new platform for effective sensing cysteine (Cys) was developed based on fluorescence resonance energy transfer (FRET) between FAM-tagged single-stranded DNA (FAM-ssDNA) and graphene oxide (GO). Due to the noncovalent assembly between FAM-ssDNA and GO, fluorescence quenching of the FAM took place because of FRET. This method relied on the competitive ligation of Ag + by Cys...
In this work, graphene oxide (GO) was firstly prepared, following by element analysis. Glutaraldehyde cross-linked chitosan (GCCS) and chitosan/graphene oxide (CSGO) composite with three different amounts of GO (5wt%, 10wt% and 15wt%) were also prepared for the adsorption of Au(III) and Pd(II) in aqueous solution. The properties of the adsorbents were investigated by Fourier transform infrared spectroscopy...
We reported on the synthesis and application of ionophore–gold nanoparticle conjugates in Ag + graphene paste electrode. Ionophore was a novel graphene oxide nanosheets (NGO) covalently grafted 2-thiophenecarboxylic (TPC) hybrid material. The hybrid material NGO–TPC decorated with gold nanoparticles was used as both a receptor and an ion-to-electron transducer to fabricate Ag + graphene...
A new method for determination of l-tryptophan (l-try) using the flow injection chemiluminescence (FI-CL) system of KMnO 4 –SnCl 2 –CHOH based on a graphene oxide–magnetite-molecularly imprinted polymer (GM-MIP) is described. The l-try GM-MIP was synthesized using graphene oxide (G) which improved the adsorption capacity as carrier, and magnetite nanoparticles which made the polymers...
A hairpin molecular beacon tagged with carboxyfluorescein in combination with graphene oxide as a quencher reagent was used to detect the DNA damage by chemical reagents. The fluorescence of molecular beacon was quenched sharply by graphene oxide; while in the presence of its complementary DNA the quenching efficiency decreased because their hybridization prevented the strong adsorbability of molecular...
Based on exonuclease III (Exo III) aided amplification and graphene oxide (GO) platform for fluorescence quenching, a novel, turn-on fluorescent aptasensor for lysozyme (Lys) protein was constructed. The system contains a hairpin probe (HP) and a signal probe (SP) labeled with carboxyfluorescein (FAM) at its 5′ end. HP, which consists of the aptamer sequence of Lys, is partially complementary to SP...
In this work, the unique properties of graphene oxide were combined with the anion selectivity of metalloporphyrin to fabricate a novel fluoride-selective sensor. The electrode made of 27% PVC, 54% NPOE, 4% NaTPB and 15% NbTPPGO was found to show the most favorable behavior. The sensor shows a Nernstian response (58.3mV decade −1 ) in the concentration window of 5.0×10 −1 –5.0×10...
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