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. 2020 Jan 8;10(3):1232–1242. doi: 10.1039/c9ra09512h

Zone of inhibition (ZOI) diameter of (a) ZnO, (b) 2NZO, and (c) 5NZO samples against E. coli at different concentrations. N.D. indicates that the zone of inhibition was not detecteda.

Samples Zone of inhibition (mm)
(i) 0.5 mg mL−1 (ii) 1.25 mg mL−1 (iii) 2.5 mg mL−1 (iv) 5 mg mL−1
(a) ZnO N.D. N.D. N.D. N.D.
(b) 2NZO N.D. N.D. N.D. 15
(c) 5NZO N.D. N.D. 15 20
a

DMSO (v) was used as negative control in all Petri dishes.