Fig. 5.

Representative changes in optical density at 600 nm (OD₆₀₀) with time ( 0 h, 2 h, 5 h, 10 h, 15 h) for PIC particles, prepared at different [N:SO₃Na] ratios, suspended in 1:1 LB:HEPES media in the absence (A) and presence of P. aeruginosa (B). Changes in OD₆₀₀ represent the difference between the initial OD₆₀₀ (t = 0 h) and the OD₆₀₀ at each time point. No increase in optical density was observed for any of the individual components in the absence of P. aeruginosa (Fig. S7A†). n = 3. Each colour represents a different particle formulation.