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In this manuscript, the authors molecularly engineered a hybridization chain reactions (HCRs) based probe on magnetic Fe3O4 nanoparticles for the sensitive detection of Hg2+. The sensing system comprised three probes: capture probe H1, report probe H2, and report probe H3. The capture probe was modified on the surface of magnetic Fe3O4 nanoparticles. The report probes were labeled with fluorescein...
A simple method has been developed for the simultaneous determination of 16 polycyclic aromatic hydrocarbons (PAHs) in mainstream cigarette smoke. The procedure is based on employing a homemade graphene-coated solid-phase microextraction (SPME) fiber for extraction prior to GC/MS. In comparison to commercial 100-μm poly(dimethyl siloxane) (PDMS) fiber, the graphene-coated SPME fiber exhibits advantageous...
In this paper, a sensitive time-gated fluorescent sensing strategy for mercury ions (Hg 2+ ) monitoring is developed based on Hg 2+ -mediated thymine (T)–Hg 2+ –T structure and the mechanism of fluorescence resonance energy transfer from Mn-doped CdS/ZnS quantum dots to graphene oxide. The authors employ two T-rich single-stranded DNA (ssDNA) as the capture probes for Hg ...
By introducing p-phenylenediamine (PPD) to the hybrid system of Mn-doped CdS/ZnS quantum dots (QDs) and glucose oxidase (GOD), a sensitive label-free method was proposed for direct detection of glucose. With glucose and PPD as substrates, 2,5-diamino-N,N′-di-(4-aminophenyl)-2,5-cyclohexadiene-1,4-diimine (DDACD) that intensively quenches the fluorescence of QDs can be produced by the catalysis of...
Graphene's unsurpassed specific surface area (up to 2630m 2 /g) makes it be an ideal absorbent. To promote its use as a sorption coating in solid phase microextraction, an ultrafast method was established, able to coat a stable layer of graphene on a metal fiber in only 23s, with adjustable coating thickness between 10 and 40µm by using sleeve barrels. The core idea includes: (1) use of semi-polymerized...
A simple and sensitive method for simultaneous determination of 11 monohydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) in human urines has been developed based on stir bar sorptive extraction (SBSE) and liquid chromatography/tandem mass spectrometry (HPLC–MS/MS). Factors that may influence the extraction efficiency, such as pH value of matrix, extraction time, desorption solvents and desorption...
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