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Synthesis of 5-dimethylaminonaphthalene-1-sulfonyl carboxymethyl chitosane

Enayatollah Mottaghinejad, Zahrasadat Moghadasfazeli, Abolfath Akbarzadeh

Deacetylated carboxymethyl chitosane (CM-chitosane) can reactwith dansyl chloride [5-Dimethylaminonaphthalene-1-sulfonyl chloride], affording 5- Dimethylaminonaphthalene-1-sulfonyl CM-chitosane. This reaction takes places under dilute sodium hydroxide in water/methanol solvent system to afford fluorescent dansylated CM-chitosane in good yield. The fluorescent property of the polymer is well established by different methods such as spectrofluorimetry, visualization under uv-lamp, preparation of fluorescent strips of filter paper by dipping it into the polymer solution and similar methods. Spectroscopic data such asH-NMR, FT-IR andUV-Visible arewell correspond with the bond formation of the CM-chitosane to the dansyl group.