Table 3.

Effect of different co-surfactants on the emulsification efficiency of the selected oil phases with the selected surfactant Tween 80; data expressed as mean value ± S.D. (n = 3).

% Transmittance
Oil	Labrasol	Transcutol-P	Propylene glycol
Cinnamon oil	100.08 ± 1.14	99.77 ± 0.61	100 ± 0.61
Clove oil	99.92 ± 0.48	100.16 ± 0.88	100.31 ± 0.7
Ethyl oleate	19.83 ± 1.33*	24.89 ± 0.67	29.55 ± 1.08*

*P < 0.05 when compared to Transcutol-P, **P < 0.001 when compared to Transcutol-P.