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Magnetic nanoparticles (MNPs) synthesised by chemical co-precipitation method was subjected to dextran coating by sonication method. The dextran was enzymatically synthesised by extracellular dextransucrase isolated from Weissella cibaria JAG8. The crystalline nature of MNPs and dextran coated MNPs were confirmed by X-ray diffraction studies with average particle size of 25 nm, which was confirmed further by high resolution transmission electron microscopy. The surface morphology of MNPs and dextran coated MNPs were monitored by scanning electron microscopy studies. The vibrating sample magnetometer investigation displayed the super paramagnetic nature of MNPs and dextran coated MNPs. FT-IR analysis of MNPs and dextran coated MNPs, displayed characteristic band of Fe–O bond at 582 cm−1. Thermo-gravimetric analysis of MNPs and dextran coated MNPs (1:1) ratio displayed a weight loss of 15 and 18 %, which clearly indicated 3.0 % of dextran was coated on to the MNPs. The elemental composition study by scanning electron microscopy confirmed the association of dextran with MNPs. The in vitro effect of MNPs and dextran coated MNPs was performed on human colon cancer (HT-29) cell lines and the results showed that dextran coated: MNPs (2:1) displayed good biocompatibility results over dextran coated: MNPs (1:1) and un-coated MNPs.
Journal of Polymers and the Environment – Springer Journals
Published: Sep 22, 2016
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