In addition to the carboxymethylation of the CSNPs, other adjustments can be made to make the NPs better suited for specific scenarios. For example, the study conducted by Farag et al. in 2014 outlined the novel synthesis of chitosan nanoparticles with magnetic cores. This was done by coating iron (II, III) oxide, also known as magnetite (Fe 3 O 4 ) with the chitosan to allow for specific sites to be targeted for delivery of drugs utilizing magnetic fields to move the NPs.