Table 1. Effect of a single surfactant on the particle size and dispersibility of the avermectin aqueous dispersions.

surfactanta	mean size (nm) ± S.D.	PDIb ± S.D.c
SDS	588 ± 43 de	0.283 ± 0.224 a
SDBS	480 ± 29 e	0.239 ± 0.207 a
Polycarboxylate	426 ± 36 e	0.264 ± 0.194 a
MRES	265 ± 11 e	0.254 ± 0.026 a
SLES	2317 ± 186 b	0.584 ± 0.391 a
Tween 80	392 ± 5 e	0.351 ± 0.040 a
Span 80	939 ± 74 d	0.694 ± 0.531 a
PVP K30	4820 ± 568 a	0.514 ± 0.243 a
HPMC	1592 ± 272 c	0.663 ± 0.430 a

^aSDS: 1-dodecanesulfonic acid sodium salt; SDBS: sodium dodecylbenzenesulfonate; MRES: maleic rosin-polyoxypropylene-polyoxyethylene ether sulfonate; SLES: sodium lauryl ether sulfate; Tween 80: polyoxyethylene sorbitan monooleate; Span 80: sorbitan monooleate; PVP K30: polyvinylpyrrolidone K30; HPMC: hydroxypropyl methylcellulose.

^bPDI: polydispersity index.

^cS.D.: standard deviation of three measurements.

Different letters indicate significant differences according to Duncan’s multiple range test at P < 0.05.