Physico-chemical studies and emulsifying properties of N-propyl-N-methylene phosphonic chitosan

► Low concentration solutions of chitosan derivative are formed by free molecules. ► At higher concentrations chitosan derivative form aggregates in several steps. ► In alkaline medium coiled molecules stretch and give a cooperative reaction. ► Derivative has emulsifying properties forming O/W emulsions. ► Emulsions have high stability to long time storage.