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Background  Multifunctional magnetic nanoparticles are important class of materials in the field of nanobiotechnology, as it is an emerging area of research for material science and molecular biology researchers. One of the various methods to obtain multifunctional nanomaterials, molecular functionalization by attaching organic functional groups to nanomagnetic materials is an important technique. Recently, functionalized magnetic nanoparticles have been demonstrated to be useful in isolation/detection of dangerous pathogens (bacteria/viruses) for human life. Iron (Fe) based material especially FePt is used in the isolation of ultralow concentrations (< 10 2  cfu/ml) of bacteria in less time and it has been demonstrated that van-FePt may be used as an alternative fast detection technique with respect to conventional polymerase chain reaction (PCR) method. However, still further improved demonstrations are necessary with interest to biocompatibility and green chemistry. Herein, we report the synthesis of Fe 3 O 4  nanoparticles by template medication and its application for the detection/isolation of  S. aureus  bacteria.    Results  The reduction of anhydrous Iron chloride (FeCl 3 ) in presence of sodium borohydride and water soluble polyelectrolyte (polydiallyldimethyl ammonium chloride, PDADMAC) produces black precipitates. The X-ray diffraction (XRD), XPS and TEM analysis of the precipitates dried at 373 K demonstrated the formation of nanocrystalline Fe 3 O 4 . Moreover, scanning electron microscopy (SEM) showed isolated  staphylococcous aureus  ( S. aureus ) bacteria at ultralow concentrations using collagen coated gum arabic modified iron oxide nanoparticles (CCGAMION).    Conclusion  We are able to synthesize nanocrystalline Fe 3 O 4  and CCGAMION was able to isolate  S. aureus  bacteria at 8-10 cfu (colony forming units)/ml within ~3 minutes.

Gum arabic modified Fe3O4 nanoparticles cross linked with collagen for isolation of bacteria