Table 2:

Particle characterization. Agglomerate size and zeta potential in RPMI culture media. Endotoxin measured from raw particles.

Particle	Size (Mean nm ± S.D.)	Zeta Potential (Mean mV ± S.D.)	Endotoxin U/mL and ng/mL*
MWCNT	332.3 ± 132.2	−12.06 ± 0.666	9.3	0.93
Ag-MWCNT-COOH	210.7 ± 544.5	−10.24 ± 1.29	43	4.3
MWCNT-COOH	126.3 ± 9.8	−11.23 ± 0.4	41	4.1
GO	169.3 ± 46.6	−10.36 ± 1.27	27	2.7
Ag-GO	217.7 ± 5.7	−10.29 ± 0.47	42	4.2

^*Unit conversion approximately 1U equal to 0.1ng.