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Investigators from Graduate School Report New Data on Nanoparticles

February 21, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Nanoparticles. According to news reporting originating from Beijing, People's Republic of China, by NewsRx correspondents, research stated, "The core@shell Fe3O4@Au nanoparticles (NPs) functionalized with exchangeable self-assembled monolayers have been developed for mode switching magnetic solid-phase extraction (MSPE) using high performance liquid chromatography with ultraviolet detection. The adsorbents were synthesized by chemical coprecipitation to prepare magnetic cores followed by sonolysis to produce gold shells."

Our news editors obtained a quote from the research from Graduate School, "Functionalization of Fe3O4@Au NPs surface was realized through self-assembly of commercially available low molecular weight thiol-containing ligands using gold shells as intermediate platform and the dynamic nature of Au-S chemistry allowed substituent of one thiol-containing ligand with another simply by thiol exchange process. The resultant adsorbents were characterized by transmission electronic microscopy, Fourier transform infrared spectroscopy, elemental analysis, contact angle measurement, and vibrating sample magnetometry. To evaluate the versatile performance of the developed MSPE adsorbents, they were applied for normal-phase SPE followed by reversed-phase SPE. A few kinds of diphenols and polycyclic aromatic hydrocarbons (PAHs) were employed as model analytes, respectively. The predominant parameters affecting extraction efficiency were investigated and optimized. Under the optimum experimental conditions, wide dynamic linear range (6.25-1600 mu g L-1 for diphenols and 1.56-100 mu g L-1 for PAHs) with good linearity (r(2) >= 0.989) and low detection limits (0.34-16.67 mu g L-1 for diphenols and 0.26-0.52 mu g L-1 for PAHs) were achieved."

According to the news editors, the research concluded: "The advantage of the developed method is that the Fe3O4@Au NPs could be reutilized for preconcentrating diverse target analytes in different SPE modes sequentially simply through treatment with desired thiol-containing ligands."

For more information on this research see: Facile preparation of surface-exchangeable core@shell iron oxide@gold nanoparticles for magnetic solid-phase extraction: Use of gold shell as the intermediate platform for versatile adsorbents with varying self-assembled monolayers. Analytica Chimica Acta, 2014;811():36-42. Analytica Chimica Acta can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier -; Analytica Chimica Acta -

The news editors report that additional information may be obtained by contacting Y.P. Li, Univ Chinese Academy Sci, Grad Sch, Beijing 100049, People's Republic of China. Additional authors for this research include L. Qi, Y. Shen and H.M. Ma (see also Nanoparticles).

Keywords for this news article include: Asia, Beijing, Nanotechnology, Emerging Technologies, People's Republic of China

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Source: Science Letter

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