Table 2.

Zeta potential values in mV for the nanoparticles in five different media ^a.

Nanoparticle	SGF pH 1.2	SLF pH 4.5	DI Water pH 6.5	SIF pH 6.5	SBF pH 7.4
Stöber 100	3 ± 3	−11 ± 3	−43 ± 1	−17 ± 1	−19 ± 2
Meso 100	3 ± 2	−2 ± 1	−39 ± 2	−7 ± 1	−13 ± 1
Meso 500	−2 ± 2	−5 ± 2	−29 ± 1	−8 ± 0.5	−13 ± 1
Disulfide Meso 100	2 ± 2	−5 ± 1	−28 ± 2	−2 ± 0.2	−6 ± 0.2
Disulfide Hollow 100	0 ± 0.5	−10 ± 2	−24 ± 1	−20 ± 3	−16 ± 1

^aData are mean ± SD (N=3).