Table 1 Characteristics of silica nanoparticle suspensions (0.5 mg/ml) in HEPES buffer (25 mM, pH 7.2)
Sample | Hydrodynamic Size (nm) | Zeta potential (mv) | Fluorescence intensity at λ = 520 nm |
---|---|---|---|
S-MSP1 | 687 | −18 | 567 |
S-MSP2 | 875 | ≈0 | 392 |
NR-MSP | 470 | −16 | 626 |
S-MSP1-PEI ads. | 692 | 22 | 216 |
S-MSP2-PEI graf. | 569 | 33 | 203 |
NR-MSP-PEI ads. | 298 | 15 | 266 |
NR-MSP-PEI graf. | 388 | 23 | 227 |
NR-MSP-PEI-ACA | 452 | −12 | 170 |
NR-MSP-PEI-SUCC | 389 | −29 | 511 |