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Preparation of SiO2/(PMMA/Fe3O4) Nanoparticles Using Linolenic Acid as Crosslink Agent for Nucleic Acid Detection Using Chemiluminescent Method

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Usually, magnetic nanoparticles (MNPs) are prepared based on the famous Stöber process in which divinylbenzene (DVA) is often used as a crosslink agent to synthesize SiO2/(PMMA/Fe3O4 nanoparticles. Compared with DVA, linolenic acid (LNA) is innoxious and can polymerize more easily for it has three unsaturated double bonds. In this paper, LNA was used as a new crosslink agent instead of DVA to synthesize the SiO2/(PMMA/Fe3O4 nanoparticles. The results showed that the core–shell structure could be observed obviously. The sizes of nanoparticles with core–shell structure range from 200 to 500 nm. The DNA probes which was immobilized on the surface of MNPs were used to capture the biotin modified complementary sequence of the probe, and the formed complexes were bonded with streptavidin-modified alkaline phosphatase (SA–AP). Finally the chemiluminescent signals were detected by adding 3-(2'-spiroadamantane)-4-methoxy-4-(3"-phosphoryloxy) phenyl-1,2-dioxetane (AMPPD) which was the substrate reagent of AP. The specificity and sensitivity of this approach were investigated in this paper.
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Document Type: Research Article

Publication date: 2011-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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