Table 2.

Average sizes of various microemulsion formulations. Each formulation contains 2 wt % surfactant, 1 wt % glycerol, and different amounts of tributyrin or ethyl caproate.

(1) Mixed Surfactant Systems Consisting of Pannox 74 and Tween 80
Mixed Surfactant (w/w) $\left(\frac{Pannox74}{Pannox74+Tween80}\right)$	Oil Content	Aggregate Size (nm)
		After 1 Day	After 7 Days
0.2	0.3 wt % tributyrin	81.4	258.0
0.4	0.3 wt % tributyrin	79.2	87.2
0.5	0.3 wt % tributyrin	109.0	104.0
0.6	0.3 wt % tributyrin	87.5	240.0
0.8	0.3 wt % tributyrin	119.0	261.0
0.2	0.7 wt % ethyl caproate	96.6	110.5
0.4	0.7 wt % ethyl caproate	66.8	88.8
0.5	0.7 wt % ethyl caproate	59.4	63.4
0.6	0.7 wt % ethyl caproate	106.9	116.8
(2) Mixed Surfactant Systems Consisting of Pannox 74 and Cremophor EL
Mixed Surfactant (w/w) $\left(\frac{Pannox74}{Pannox74+Cremophor\mathrm{EL}}\right)$	Oil Content	Aggregate Size (nm)
		After 1 Day	After 7 Days
0.4	0.3 wt % tributyrin	188.8	216.9
0.5	0.3 wt % tributyrin	170.5	206.4
0.6	0.3 wt % tributyrin	270.2	274.9
0.4	0.5 wt % tributyrin	185.6	19 6.3
0.5	0.5 wt % tributyrin	200.7	195.4
0.6	0.5 wt % tributyrin	192.5	207.1
0.2	0.7 wt % ethyl caproate	101.9	82.4
0.4	0.7 wt % ethyl caproate	93.4	114.1
0.5	0.7 wt % ethyl caproate	233.5	301.4