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In this paper, a simple and convenient fluorescent “turn off-on” strategy for the highly sensitive detection of dopamine (DA) and ascorbic acid (AA) based on graphene quantum dots (GQDs) was developed. DA and GQDs can form the DA-GQDs complex due to the electrostatic interaction and hydrogen bonding. The interaction between Cu2+ and the catechol moiety of DA-GQDs complex could lead to strong fluorescence...
The detection of antibiotics is critical and challenging due to the pervasive use of antibiotics had inevitably brought some negative impacts on ecosystem and human health. Herein, we reported an anti-interfere ability enhanced luminescent sensor of lanthanide metal–organic framework (Ln-MOF) filled mixed matrix membranes (MMMs), which combining the processibility of poly(methyl methacrylate) (PMMA)...
Fluorescent nitrogen-doped carbon dots (NCDs) were synthesized by a facile, and low-cost one-step hydrothermal strategy using citric acid as carbon source and ammonia solution as nitrogen source for the first time. The obtained NCDs show stable blue fluorescence with a high quantum yield of 35.4%, along with the fluorescence lifetime of ca. 6.75ns. Most importantly, Hg2+ can completely quench the...
The electrochemical fructose sensor attracts considerable attention in the food industry and for clinical applications. Here, a novel fructose biosensor was developed based on immobilization of highly dispersed CuOCu nanocomposites on Graphene that was non-covalently functionalized by sodium dodecyl benzene sulfonate (SDBS) (denoted briefly as SDBS/GR/CuOCu). The structure and morphology of SDBS/GR/CuOCu...
A capillary zone electrophoresis (CZE) method modified by β-cyclodextrin (β-CD) and acetonitrile (ACN) was developed for simultaneous determination of seven structurally similar flavonoids in Scutellariae Barbatae Herba (SBH) and its preparations. Molecular selectivity of the analytes by β-CD was in the following order: apigenin, luteolin, quercetin, scutellarin, baicalein, rutin and wogonin, based...
Screening G-quadruplex ligands from natural plants is important because the ligands may be potential antitumor drugs. A new screening strategy is proposed based on the combination of dialysis and G-quadruplex recognition technique which could separates G-quadruplex ligand from natural extracts and elucidate the structure of this ligand. This result offers a novel approach to obtain active antitumor...
The first example of cyclometalated platinum(II)-containing rhodamine probe (1) with two-photon induced luminescent properties was synthesized and investigated for mercury detection. A highly selective color change of 1, from light yellow to pink, is observed only in the presence of Hg 2+ due to the formation of 1,3,4-oxadiazole ring in 2. This selectivity of Hg 2+ with color changes...
Molecularly imprinted polymers (MIPs) using methyl-testosterone as the template, methacrylic acid (MAA) as the monomer and ethylene glycol dimethacrylate (EDMA) as the crosslinker were prepared by precipitation polymerization. The morphology of the obtained particles was characterized by scanning electron microscopy (SEM) and the pore size was measured by BET. Then, the specificity and selectivity...
The interaction of Aloe-emodin (AE) with salmon sperm DNA in 0.1M Tris–HCl buffer (pH 4.4) and at the DNA-modified glassy carbon electrode (GCE) was systemically studied with voltammetry and ultraviolet–visible (UV–vis) spectroscopy. AE had excellent electrochemical activity on the GCE with a couple of redox peaks. We propose that AE can intercalate into DNA strands forming a nonelectroactive complex,...
Complex matrices and rather high acidity in environmental samples are often the impelling challenges for the used running buffers of capillary electrophoresis. Twelve binary acid–base buffers were evaluated for separation of Cr(VI)/Cr(III), Co 2+ and Zn 2+ in a sample containing various salts by capillary electrophoresis with contactless conductivity detector. The malic acid (MA) systems...
A novel assay for the voltammetric detection of 18-bases DNA sequences relating to Chronic Myelogenous Leukemia (CML, Type b3a2) using methylene blue (MB) as the hybridization indicator was reported. DNA was covalently attached onto a glassy carbon electrode (GCE) through amines of the DNA bases using N-hydroxysulfosuccinimide (NHS) and N-(3-dimethylamion)propyl-N′-ethyl carbodiimidehydrochloride...
The electrochemical behavior of maltol on a glassy carbon (GC) electrode was investigated. The results were applied to differential pulse voltammetric determination of maltol in beverages pretreated by ultrafiltration. Under the optimum experimental conditions, the linear range is 1×10 −5 to 6×10 −4 moll −1 maltol and the relative standard deviation for 0.4mmoll −1 ...
This paper described the determination of trace manganese using linear sweep voltammetry at a pretreatment glassy carbon electrode. The glassy carbon electrode pretreated by electrochemical method in the 0.1 moll -1 NaOH solution greatly improved the electrode responsibility in the determination of manganese(II). The barrier to the detection of low manganese concentration was overcome...
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