title: Enhancing the production of eicosapentaenoic acid (EPA) from Nannochloropsis oceanica CY2 using innovative photobioreactors with optimal light source arrangements.
abstract: Binary combinations of LEDs with four different colors were used as light sources to identify the effects of multiple wavelengths on the production of eicosapentaenoic acid (EPA) by an isolated microalga Nannochloropsis oceanica CY2. Combining LED-Blue and LED-Red could give the highest EPA productivity of 13.24 mg L(-1) d(-1), which was further enhanced to 14.4 mg L(-1) d(-1) when using semi-batch operations at a 40% medium replacement ratio. A novel photobioreactor with additional immersed light sources improved light penetration efficiency and led to an 38% (0.170-0.235 g L(-1) d(-1)) increase in the microalgae biomass productivity and a 9% decrease in electricity consumption yield of EPA (10.15-9.33 kW-h (g EPA)(-1)) when compared with the control (i.e., without immersed light sources). Operating the immersed LEDs at a flashing-frequency of 9 Hz further lowered the energy consumption yield to 8.87 kW-h (g EPA)(-1).
authors.affiliation: Center of Bioscience and Biotechnology, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: Chun-Yen
authors.initials: CY
authors.lastname: Chen
authors.affiliation: Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: Yu-Chun
authors.initials: YC
authors.lastname: Chen
authors.affiliation: Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: Hsiao-Chen
authors.initials: HC
authors.lastname: Huang
authors.affiliation: Organization of Advanced Science and Technology, Kobe University, Kobe, Japan.
authors.forename: Shih-Hsin
authors.initials: SH
authors.lastname: Ho
authors.affiliation: Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan; Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan. Electronic address: changjs@mail.ncku.edu.tw.
authors.forename: Jo-Shu
authors.initials: JS
authors.lastname: Chang
mesh_terms: D019149:Bioreactors; D015118:Eicosapentaenoic Acid / Q000096:biosynthesis*; D008027:Light; D058086:Microalgae / Q000378:metabolism*; D010777:Photochemistry / Q000295:instrumentation*
chemical_list: D015118:Eicosapentaenoic Acid
keywords: EPA; Flashing frequency; Immersed light source; LED; Nannochloropsis oceanica