Table 1.

Characteristic properties of population of suspensions of agglomerated engineered nanoparticles

Engineered nanoparticles	pH	Zeta potential[mV]	Stability behaviour	Size(measured by DLS)
TiO2 in PBS- citrate	7,9	−26	Incipient instability
ZnO in PBS- citrate	7,9	−29	Incipient instability
TiO2 in 0,3 M glucose	4,4	−22	Incipient instability	600-4000 nm (average 1820 nm)
ZnO in 0,3 M glucose	6,6	−15	Incipient instability	100 – 1200 nm (average 431 nm)

The DLS measurements of TiO₂ and ZnO EP suspensions in glucose could be performed, but the DLS measurements of TiO₂ and ZnO EP suspensions in PBS citrate could not be performed due to fast sedimentation.