1 2 3 4 5 6 7 8 9 100.25

0.30

0.35

0.40

0.45

0.50

0.55

0.60

0.65

Vegetable extract:Tween 80 ratio

Inte

rfac

ial t

ensi

on (m

N/m

)

Figure 3. Interfacial tension measurements at hydro-alcoholic extract-isopropyl myristate interface throughout addition of Tween 80

optimal extract:Tween 80 ratio (2.1:1)

0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00-0.01

0.01

0.03

0.05

0.07

0.09

0.11

0.13

0.15

0.17

0.19

Tween 80:n-octanol ratio

Inte

rfac

ial t

ensi

on (m

N/m

)

Figure 4. Interfacial tension measurements at the Tween 80-extract solution (at optimal

ratio)-isopropyl myristate interface throughout addition of n-octanol

optimal Tween 80:n-octanol ratio (1:1.25)