Table 1: PEI surface functionalization results and zeta potential values of GP and PEI-GPs.

GP samplePEI surface functionalization results μmol PEI/mg GPZeta potential peak
(±5 mV)

GP2.4
1.2 k PEI-GP0.012 ± 0.00222.1
1.8 k PEI-GP0.031 ± 0.02121.7
10 k PEI-GP0.015 ± 0.00121.1
25 k PEI-GP0.0136 ± 0.00330.2
100 k PEI-GP0.0192 ± 0.00133.3