The extraction of lipids with n-hexane was performed by mixing 20 mL of sample and 20 mL of n-hexane. The mixture was kept at 40 °C/60 °C and 200 rpm for 4 h, and then centrifuged at 4000 rpm for 10 min. Two different extraction temperatures were tested in order to analyse the influence of this variable. After centrifugation, the mixture partitioned into three fractions: organic phase, aqueous phase and residual solid. The top hexane phase was collected and then it was heated to dryness in the oven (at 70 °C) to enable gravimetric quantification of the lipid extract. Both the Bligh and Dyer and n-hexane extraction methodswere performed in duplicate and no significant differences were found between the two measurements.