Animal Fats and Waste Cooking Oils

Chemical Composition of Various Microalgae Species (% Dry Weight) 

Supercritical Fluids Technology In Lipase Catalyzed Processes 

FIGURE6.1 (See color insert.) Fluorescence images of lipids accumulation in Scenedesmus sp. after (a) 1, (b) 11, (c) 14, (d) 20, and (e) 23 days of nitrogen starvation. (From Taber, H., S. Al-Zuhair, A. H. Al-Marzouqi, Y. Haik, and M. Farid, 2014, Effective Extraction of Microalgae Lipids from Wet Biomass for Biodiesel Production, 66 159-167. With permission.) 

Generally, microalgae lipids include nentral lipids, polar lipids, wax esters, sterols, and hydrocarbons, as well as phenyl derivatives (Naik et al, 2010). For biodiesel prodnction, natural lipids, which are nonpolar, are always targeted. Typically, most of the lipids produced from microalgae strains that have been tested for biodiesel prodnction have fatty acid constitutions similar to most common vegetable oils (Becker, 2004 Huang et al., 2012), as shown in Table 6.1. 

---