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Synthesis of DOPA-PEG600-NHS (a) and DOPA-SA-PEG2000 (b). I, Poly(ethylene glycol) bis(carboxymethyl) ether-600; II, Poly(ethylene glycol) bis(carboxymethyl)-600 NHS ester (PEG600-2NHS); III, Dopamine-PEG600-NHS (DOPA-PEG600-NHS); IV, Poly(ethylene glycol) methyl ether 2000; V, poly(ethylene glycol) methyl ether 2000 succinic acid (PEG2000-SA); VI, PEG2000-SA-NHS ester (PEG2000-SA-NHS); VII, Dopamine- PEG2000-SA(DOPA-SA-PEG2000).
