Extraction pre-treatment
In experiments where dried microalgae was used, the microal-
gal paste was dried at 85 °C in an oven (Model UNE 500 PA,
Memmert GmbH+Co., Germany) for 16 h. A ring mill was then used
to grind the dried biomass into powder. In experiments involving
wet microalgae, the microalgal paste obtained from bench top cen-
trifugation was used directly without further treatment. The solid
concentration of the paste was 30 wt%. This was determined by
drying a portion of the paste and comparing its pre-dried mass
to that of the corresponding dried biomass. Both microalgal
powder and paste were stored at 5 °C for no longer than
1.5 months before they were used for lipid extraction