Encapsulation of PEG-coated GNPs into P6c SAPNs. TEM images of the encapsulation samples for the PEG-coated gold nanoparticles into P6c SAPNs: (a) 5 nm PEG-coated GNPs, (b) 10 nm PEG-coated GNPs. The encapsulation of PEG-coated GNPs into P6c SAPNs failed. (c) DLS profiles for volume distribution of hydrodynamic sizes of the encapsulation samples. The P6c protein concentration is 0.05 mg/ml for all samples.