Chatzifragkou et al. [19] demonstrated the ability of fifteen
strains of fungi and yeast to grow on waste glycerol derived from
the biodiesel industry and yeast extract as nitrogen sources. It
was concluded that oleaginous yeasts depict higher biomass production
compared to filamentous fungi, however only one strain
of yeast, Rhodotorula sp. LFMB 22, was able to accumulate lipids.
In contrast, Zygomycetes strains accumulated large amounts of lipids.
The lipid fraction of the oil obtained from the yeast Yarrowia
lipolytica LFMB19 comprised more than 80% of neutral lipids that
are suitable for the production of biodiesel. Total lipids included
glycolipids, waxes, phospholipids, etc. which cannot be converted
into methyl esters through transesterification. This would make
necessary the inclusion of lipid pretreatment.