Accumulation potential of lipids and analysis of fatty acid profile of few microalgal species for biodiesel feedstock

Dharmendra Kumar Singh, Nirupama Mallick

Abstract


High lipid content with adequate fatty acid profile is required for focusing any microalgal species as a renewable feedstock for biodiesel production. The present study examines the lipid accumulation potential of two green and two blue-green microalgal species, and analyzes the fatty acid profiles under various conditions for possible recommendation. Maximum lipid accumulation of ~ 40% of dry cell weight (dcw) was recorded under N and P starvation in the green microalgae, Scenedesmus obliquus and Chlorella vulgaris. For cyanobacterial species (Nostoc muscorum and Synechocystis PCC 6803), the response was poor under all the conditions studied. The relative percentage of saturated fatty acids (SFA) was maximum in green as well as blue-green microalgal species under control and all the treated conditions. Oleic acid (monounsaturated fatty acid, MUFA) content was increased, and the relative percentage of polyunsaturated fatty acids (PUFA), i.e. linoleate and linolenate decreased against control in all the four microalgae under the treated conditions. The green microalgae, Chlorella vulgaris and Scenedesmus obliquus, are found to be the suitable feedstock for biodiesel production with lipid accumulation ~ 40% (dcw) under specific conditions. A significant rise in the relative percentage of SFA and MUFA, and fall in PUFA contents are desirable for production of good quality biodiesel.

 

Keywords: Green and blue-green microalgae; lipids; monounsaturated fatty acids; polyunsaturated fatty acids; saturated fatty acids


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