Effect of diethyl aminoethyl hexanoate on the accumulation of high-value biocompounds produced by two novel isolated microalgae

The low productivity of microalgae has restricted scale-up application of microalgae-based biodiesel processes. Diethyl aminoethyl hexanoate (DA-6) was investigated to enhance the biomass and metabolite productivity. At a very low concentration (10−7 M) DA-6 made Chlorella ellipsoidea SDEC-11 and Scenedesmus quadricauda SDEC-13 obtain enlarged cell size, 114 mg L−1 d−1, 101 mg L−1 d−1 biomass productivity and 39.13 mg L−1 d−1, 32.69 mg L−1 d−1 lipid productivity, respectively. Biomass and lipid productivity of SDEC-11 and SDEC-13 were 100 mg L−1 d−1 and 30.05 mg L−1 d−1, 94 mg L−1 d−1 and 28.43 mg L−1 d−1, respectively, without DA-6. Twice hormone dose in 10−6 M DA-6 medium resulted in higher biomass productivity (106 mg L−1 d−1) and longer exponential growth of SDEC-13. DA-6 also ensured the property of microalgae biodiesel to meet the EN 14214 standard. The current investigation demonstrated that DA-6 accelerated the microalgae growth and simultaneously improved the quality and quantity of lipid for biodiesel production.