The solid-phase extraction method of Farrell et al. [15] was used
to further purify the fatty acid amides from the dried lipid extracts.
The dried lipid extract was dissolved in 200 lL of n-hexane and
dissolved lipids were loaded onto 0.5 g of n-hexane-washed silica.
The mobile phase was run as follows: 4 mL of n-hexane, 1 mL of
99:1 (v/v) hexane:acetic acid, 1 mL of 90:10 (v/v) hexane:ethyl
acetate, 1 mL of 80:20 (v/v) hexane:ethyl acetate, 1 mL of 70:30
(v/v) hexane:ethyl acetate, 1.5 mL of 2:1 (v/v) chloroform:isopropanol, and ending with 1 mL of methanol. Fractions were collected
from each mobile phase solution.