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Mean hydrodynamic diameters and PDI values at different N/P ratios for BPEI (a, d), LPEI (b, e), and PLL (c, f) at pH 5.2 and 7.4. The upper limit of the device for the hydrodynamic diameter is 2000 nm, and thus, values higer than this are not shown in the figures. The errors in BPEI and PLL particles sizes were 1–7% for PDI < 0.6 and 21–47% for PDI > 0.6. For LPEI large errors were obtained between N/P 1 and 4 at pH 5.2 and N/P 2 and 8 at pH 7.4.
