“…A broad scale of materials such as chitosan, sporopollenin, magnetic nanoparticles and polymers by different functional groups have been widely used in drug delivery systems [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] . Our group has focus on development of drug carrier systems having proteins [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] . One of our previous studies has been on immobilization of hemoglobin onto sporopollenin which was showed to be high affinity to the protein, so it is possible to develop a new drug delivery system based on sporopollenin-protein [14] .…”