Table 1.
Summary of PS bead characteristics.
| PS beads |
||||
|---|---|---|---|---|
| Characteristic | 50 nm | 80 nm | 240 nm | 500 nm |
| Diameter (nm)a | 49 | 83 | 240 | 504 |
| Diameter (nm)b | 43 ± 35 | 81 ± 44 | 220 ± 60 | 370 ± 96 |
| Surface area (nm2)c | 1.88E+03 | 5.41E+03 | 4.52E+04 | 2.00E+05 |
| Internal volume (nm3)c | 6.16E+04 | 2.99E+05 | 7.24E+06 | 6.70E+07 |
| Density of PS (mg/nm3)d | 1.05E–18 | 1.05E–18 | 1.05E–18 | 1.05E–18 |
| Mass of one PS particle (mg)c | 6.47E–14 | 3.14E–13 | 7.60E–12 | 7.04E–11 |
| Initial PS particles/mL PMc | 3.87E+11 | 7.95E+10 | 3.29E+09 | 3.55E+08 |
| PS particle surface/mL PM (nm2)c | 7.28E+14 | 4.30E+14 | 1.49E+14 | 7.10E+13 |
| Detection limit of PS (μg/mL)b | < 1.25 | < 1.64 | < 0.63 | < 0.21 |
| Detection limit of PS (no./mL)c | 1.94E+10 | 5.22E+09 | 8.22E+07 | 2.96E+06 |
| Zeta potential in DD water (mV)b | −58.7 ± 2.26 | −56.4 ± 2.12 | −32.7 ± 0.78 | −42.3 ± 0.49 |
| Zeta potential in PM (mV)b | −6.23 ± 0.20 | −7.40 ± 0.70 | −8.91 ± 0.74 | −12.8 ± 1.20 |
Abbreviations: DD, double distilled; PM, perfusion medium.
a
According to manufacturer’s information.
b
Experimentally determined (mean ± SE).
c
Calculated values.
d
From literature (Sharp and Beard 1950).