Preferred thiomers of this type are polysaccharides that are cationic or can become so.
Such polysaccharides comprise amine groups or quaternary ammonium groups, examples including N, N-diethylaminoethyldextran and 2-hydroxy-3- (N, N, N-trimethylammonio) propyl partial ethers of guar gum, such as Jaguar C13S.