Chitosan improved gene delivery . It can stabilize magnetic nanoparticles that enabled high-cell transfection . Magnetic nanoparticles modified chitosan was used for surfactant capture and analysis using SALDI-MS . Chitosan can be modified with thymine to enable specific preconcentration of mercury (II) before analysis using SELDI-MS . It can be used as a porogen for creating mesopores inside microporous materials . The created hierarchical porous materials can be then used for oligonucleotide delivery offering efficient gene treatment. Chitosan mitigates the toxicity of CdS QDs offering efficient drug delivery of the anticancer drug sesamol .