“…Thus, in the current chapter, an overview on the drug delivery applications of cross-linked [23] and chemically modified chitosan is given. Important modified and cross-linked derivatives include carboxymethyl-chitosan (CMC), O-carboxymethyl-chitosan (O-CMC), N,O-carboxymethyl-chitosan (N,O-CMC) and N-carboxymethyl-chitosan (N-CMC) [14][15][16][17][18][19], succinylchitosan [24][25][26][27][28][29][30][31][32], thiolated chitosan [33][34][35][36][37][38][39][40][41][42][43], and chitosan grafted with PNIPAAm and PNVCL (chitosang-PNIPAAm and chitosan-g-PNVCL) [44][45][46][47].…”