Table 4. Examples of potential redox- and enzyme-sensitive polymeric materials, which can be applied for RA therapy.

Polymeric material	Size of nanoparticle (nm)	Stimuli	Reference
Poly(ethylene glycol)-b-poly(lactic acid)	374	Redox (disulfide bond)	Song et al. 2011
Poly(acrylamide)-poly(methacrylamide)-N,N’-bis-(acryloyl)cystamine	11.3	Redox (disulfide bond)	Zhao et al. 2011
Dimethylaminoethyl methacrylate/N,N-bis-(acryloyl) cystamine	35	Redox (disulfide bond)	Boyer et al. 2009
N-(3-aminopropyl) methacrylamide)/acrylamide	20–45	Enzyme (protease-degradable)	Wen et al. 2011