PMC

Structure of S-containing derivatives of chitosan without linkers: 31S—chitosan ethylenesulfide (N-2-mercaptoethylchitosan); 32S—N-(2-hydroxy-3-mercapto)propyl chitosan; 33S—N-3-(methylthio)propyl chitosan; 34S—chitosan derivative of 1,2-ethanedithiol (N-(4-mercapto-2-thiobutyl) chitosan); 35S—N,O-mercaptoacetyl chitosan; 36S—N-(2-thienylmethyl) chitosan; 37S—N-(2-sulfo)ethyl chitosan; 38S—chitosan sulfate; 39S—N-thiocarbamoyl chitosan; 40S—N-(methylthiocarbamoyl) chitosan; 41S—N-(phenylthiocarbamoyl) chitosan; 42S—chitosan benzoyl thiourea derivative (N-(benzoylthiocarbamoyl) chitosan); 43S—chitosan cinnamoyl thiourea derivative (N-(cinnamoylthiocarbamoyl) chitosan); 44S—dithiooxamide chitosan derivative; 45S—chitosan dithiocarbamate; 46S—dithiocarbamate modified chitosan (S-(2-carbamoylethyl) dithiocarbamate chitosan); 47S—chitosan xanthate.

Structure of N-containing derivatives of chitosan without linkers: 16N—N-(3-trimethylammonium-2-hydroxy)propyl chitosan; 17N—N-(2-hydroxy-3-methylamino)propyl chitosan; 18N—chitosan functionalized by amino-terminated hyperbranched polyamidoamine polymers; 19N—aminated chitosan beads (N′-(2-aminoethyl)carbamoylmethyl chitosan); 20N—O-(2-dimethylamino)ethyl chitin; 21N—N′-methylglycyl chitosan; 22N—chitosan resin functionalized with 3,4-diaminobenzoic acid (N-(3,4-diaminobenzoyl) chitosan); 23N—chitosan resin functionalized with a 3-nitro-4-aminobenzoic acid moiety (N-(3-nitro-4-aminobenzoyl) chitosan); 24N—N-(4-ethylaminobenzoyl) chitosan; 25N—N-3,5-di(ethylaminobenzoyl) chitosan; 26N—N-(2-pyridyl)methyl chitosan; 27N—N-(4-pyridyl)methyl chitosan; 28N—N-2-(2-pyridyl)ethyl chitosan; 29N—N-2-(4-pyridyl)ethyl chitosan; 30N—N-(4-imidazolyl)methyl chitosan.

Structures of O-containing derivatives of chitosan without linkers: 1O—N,O-carboxymethyl chitosan; 2O—carboxymethyl chitin; 3O—N-(2-carboxy)ethyl chitosan; 4O—chitosan α-ketoglutaric acid (N-(1,3-dicarboxy)propyl chitosan); 5O—hydroxamated chitosan α-ketoglutaric acid (N-(1,3-di(N′-hydroxy)carbamoyl)propyl chitosan); 6O—carboxymethyl chitosan graft copolymerization of N-acryloylglycine; 7O—N-succinyl chitosan; 8O—EDTA-modified cross-linked chitosan; 9O—DTPA-modified cross-linked chitosan; 10O—chitosan granules functionalized with poly(acrylic acid); 11O—chitosan-phthalate; 12O—trimellitic anhydride-crosslinked chitosan; 13O—chitosan-1,2,4,5-benzenetetracarboxylilic acid; 14O—N-(3,4-dihydroxybenzyl) chitosan; 15O—2,3-dihydroxypropyl chitosan.

Structure of N-containing derivatives of chitosan with linker: 53N—chitosan functionalized with 2[-bis-(pyridylmethyl)aminomethyl]-4-methyl-6-formylphenol; 54N–ethylenediamine modified magnetic crosslinking chitosan; 55N—chitosan-based resins modified with tris(2-aminoethyl)amine moiety; 56N—polyaminated chitosan chelating resin; 57N—glycine modified crosslinked chitosan resin; 58N—l-lysine modified crosslinked chitosan; 59N—chitosan resin functionalized with 2-amino-5-hydroxybenzoic acid; 60N—1,5-diazacyclooctane chitosan; 61N—3-hydroxy-1,5-diazacyclooctane chitosan; 62N—3-hydroxy-1,5,8-triazacyclodecyl chitosan; 63N—polyethyleneimine-grafted chitosan; 64N—N-allyldibenzo-18-crown-6 crown ether crosslinked chitosan; 65N—N,N′-diallyldibenzo-18-crown-6 crown ether crosslinked chitosan; 66N—chitosan-grafted-poly(2-amino-4,5-pentamethylenethiophene-3-carboxylic acid N-acryloyl-hydrazide) chelating resin.