(a).
| Ultrasonic intensity (%) | The average diameter (nm) | PDI | Zeta potential (mV) |
|---|---|---|---|
| 30 | 156.5 ± 2.4 | 0.279 ± 0.011 | −39.3 ± 2.8 |
| 40 | 130.7 ± 1.8 | 0.248 ± 0.055 | −39.4 ± 1.6 |
| 50 | 127.0 ± 2.3 | 0.305 ± 0.006 | −41.8 ± 1.3 |
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