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Enhancing lipid productivity of Chlorella vulgaris using oxidative stress by TiO2 nanoparticles
Nam Kyu Kang,양지원,Bongsoo Lee,Gang-Guk Choi,Myounghoon Moon,Min S. Park,JitKang Lim 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
Ability to increase the lipid production in microalgae is one of the heavily sought-after ideas to improvethe economic feasibility of microalgae-derived transportation fuels for commercial applications. We used the oxidativestress by TiO2 nanoparticles, a well-known photocatalyst, to induce lipid production in microalgae. Chlorella vulgarisUTEX 265 was cultivated under various concentrations of TiO2 ranging from 0.1 to 5 g/L under UV-A illumination. Maximum specific growth rate was affected in responding to TiO2 concentrations. In the presence of UV-A, chlorophyllconcentration was decreased at the highest concentration of TiO2 (5 g/L TiO2) by oxidative stress. The fatty acid methylester (FAME) composition analysis suggested that oxidative stress causes the accumulation and decomposition of lipids. The highest FAME productivity was 18.2 g/L/d under low concentrations of TiO2 (0.1 g/L) and a short induction time(two days). The controlled condition of TiO2/UV-A inducing oxidative stress (0.1 g/L TiO2 and two days induction)could be used to increase the lipid productivity of C. vulgaris UTEX 265. Our results show the possibility of modulatingthe lipid induction process through oxidative stress with TiO2/UV-A.
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