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Table 3 Agglomerate size (mean ± range), zeta potential (mean ±SD ), and endotoxin contamination of MWCNT in RPMI media

From: Effect of MWCNT size, carboxylation, and purification on in vitro and in vivo toxicity, inflammation and lung pathology

MWCNT Hydrodynamic size Zeta potential E-toxin E-toxin
  (nm) (mV) (EU/mg) (ng/50 μg)
N/S-O 568 ± 677 −10.27 ± .39 0.246 0.123
N/S-F 1845 ± 650 −9.77 ± .47 14.471 7.235
N/S-P 625 ± 131 −10.97 ± .75 0.299 0.149
W/S-O 810 ± 62 −9.73 ± 1.26 0.392 0.196
W/S-F 1161 ± 183 −9.73 ± .55 13.027 6.513
W/S-P 769 ± 52 −9.17 ± .80 11.193 5.596
N/L-O 396 ± 22 −10.6 ± .4 0.408 0.204
N/L-F 669 ± 136 −9.32 ± .16 2.629 1.31
N/L-P 441 ± 69 −10.93 ± .55 0.224 0.112
  1. N/S: narrow diameter/short length; W/S: wide diameter/short length; N/L: narrow diameter/long length.
  2. O: original MW; F: functionalized MW; P: purified MW.