The size dependent properties and biocompatibility of magnetic nano-Fe_xO are extremely promising for assembling of the drug delivery vessels. Drug delivery vessels should provide minimally invasive solutions to achieving organ-specific delivery, minimize toxic side effects, and signify efficiency of drugs (including chemotherapeutic agents, and gene therapies) to the pathologic tissues. We report on the engineering of rice seeds-like iron oxide-based nanoaggregates uniformly covered with chitosan and its physical properties. Nano-aggregates of highly ordered 7-12 nm crystallites with exact composition are shown to become stable and chemically inert drug carriers. Advanced features of Fe_xO –based nanoseeds will allow their use as new reliable and effective targeted delivery media instead of standard therapeutical treatment. Magnetic properties of seed-like Fe_xO/chitosan nanocomposites including magnetic moment, saturation magnetization, coercive field and remanence magnetization of FexO were studied in the temperature range of 10 – 400 K.

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