Abstract As nanotechnology progresses, new nanomaterials are powerful analytical chemical tools that will lead to improved selectivity, sensitivity, rapidity, miniaturizability, and portability of the analytical system. Nanoparticles can be chemically bonded to a surface or functionalized with other organic or inorganic compounds to increase their solubility.

Abstract In this study, water-soluble copper-doped carbon nanodots(Cu-CDs) with high fluores- cence quantum yield were prepared by one-step hydrothermal method using citric acid and ethylenedi- amine as precursors and copper sulfate as metal dopants. A new method for the fluorescence determi- nation of anthrax biomarker based on copper-doped carbon nanodots was established based on the strong chelation of 2, 6-pyridinedicarboxylic acid(DPA) with carbon nanodots. Under the optimum experimental conditions, there were good linear relationships for the fluorescence quenching rate of Cu-CDs with DPA in the concentration ranges of 5-100 nmol/L( r 2 = 0.9941) and 150-400 nmol/L( r 2 = 0.9976), and the detection limit of the proposed method was 2.3 nmol/L. With the advantages of low cost, high specificity, high sensitivity and simple operation, the method has a good application prospect in detection of anthrax biomarker.

Abstract In this study, graphene oxide/gold nanoparticles composite membrane modified electrodes (gce/go/aunps) were constructed by drop coating and electrodeposition. Based on the change of the probe's surface configuration before and after the combination of the target DNA and the probe, the electrochemical signal changes, so as to realize the intelligent recognition of E.coli DNA and Salmonella DNA. Take the target as the input signal, and Σ|Δ I | and |Δ I MB /Δ I FC | constructs "and" and "XOR" DNA molecular logic gates for output, and proposes a new semi adder model that can be used for logic operations. Square wave voltammetry (SWV) was used to detect the current change value Σ|Δ I | of the two labeled probes, which was consistent with E. The logarithmic values of the concentrations of coli DNA and Sal DNA showed a good linear relationship in the range of 1.0 × 10–13 to 1.0 × 10–8 mol·L –1 , and the detection limits (S/N = 3) were respectively 3.2×10 –14 mol·L –1 and 1.7×10 –14 mol·L –1 .

Abstract   W ith the mass production and application of carbon nano materials, the detection and characterization methods of carbon nano materials in different media are particularly important. This paper reviews the commonly used characterization and detection technologies of carbon nanomaterials. Firstly, the separation and enrichment technology of carbon nanomaterials, including extraction separation, is introduced. The sample pretreatment technology of fractional separation and the combination of various separation methods, and then the electron microscope is reviewed. Spectrum. Thermal analysis. Electrochemical analysis. Isotope labeling, imaging and other characterization techniques, as well as fluorescence spectroscopy. Laser induced breakdown spectroscopy. Mass spectrometry. Scanning Raman microscope and quantitative analysis methods combined with various technologies, and some new carbon nano materials and some special characterization and detection methods are introduced. Finally, the future development trend and Prospect of carbon nano materials are prospected.

Abstract Supramolecular chemistry involves non-covalent interactions and specific molecular recognition of molecules/analytes by host molecules or supramolecules. These events are present in synthesis, catalysis, chiral separations, design of sensors, cell signaling processes and drug transport by carriers. The typical behavior of supramolecules is derived from their ability to build well-structured self-assembled and self-organized entities. Cavitands are a particular group of supramolecules possessing a cavity capable to include a variety of compounds thanks to host-guest non-covalent interactions developed among cavitands and analytes. Some typical cavitands are crown ethers, calixarenes, cucurbiturils, porphyrins and cyclodextrins. The two latter families are natural product cavitands that are generally considered models for molecular recognition of cations and organic and inorganic guest molecules, being attractive host molecules from the sustainability point of view. The natural cyclodextrins (α, β and γ-cd) are obtained with reasonable cost by enzymatic treatment of starch under adequate temperature conditions. They are profusely used in pharmaceutical, food and cosmetic industries due to their very low toxicity and side effects. This review is focused on the relevance andapplications of cyclodextrins in pharmaceuticaltechnology for their ability to increase solubility and stabilize drug molecules, thereby enhancing their bioavailability. The association of cyclodextrins with diverse nanostructured materials, i.e. Carbon nanotubes, magnetic nanoparticles, silica and molecularly imprinted polymers, allows to synergize the properties of cyclodextrins and these nanostructured materials to reach highly specific molecular recognition of analytes. The exploitation of these benefits for analytical sample pre-treatment and chiral chromatographic separations are described. The use of cyclodextrins as mobile phases additives in hplc provides interesting results for green and sustainable chromatographic separations. Polymers incorporating cyclodextrins show exceptional adsorption properties for retaining toxic compounds and persistent organic pollutants from soils and water samples, allowing satisfactory recoveries of these environmental samples according to the stockholm convection principles.

Abstract Gold nanoparticles (Au NPs) were synthesized by reducing HAuCl 4 with sodium citrate. The sensitivity and selectivity of gold amalgam The sensitivity and selectivity of gold amalgam catalytic degradation of rhodamine B(RhB) system for mercury detection were investigated by fluorescence spectroscopy and ultraviolet·visible In the experiment, students' interest in scientific research and exploratory spirit will be stimulated, In the experiment, students' interest in scientific research and exploratory spirit will be stimulated, students' comprehensive experimental operation skills and subjective initiative will be improved, the understanding and application The understanding and application of nanoparticles preparation, characterization, catalytic reaction knowledge and metal ion analysis methods will be enhanced. Further, the innovative thinking and scientific spirit of the students will be cultivated.