title: Manipulation of light wavelength at appropriate growth stage to enhance biomass productivity and fatty acid methyl ester yield using Chlorella vulgaris.
abstract: LEDs light offer several advantages over the conventional lamps, thereby being considered as the optimal light sources for microalgal cultivation. In this study, various light-emitting diodes (LEDs) especially red and blue color with different light wavelengths were employed to explore the effects of light source on phototrophic cultivation of Chlorella vulgaris. Blue light illumination led to significantly increased cell size, whereas red light resulted in small-sized cell with active divisions. Based on the discovery of the effect of light wavelengths on microalgal biology, we then applied appropriate wavelength at different growth stages; blue light was illuminated first and then shifted to red light. By doing so, biomass and lipid productivity of C. vulgaris could be significantly increased, compared to that in the control. These results will shed light on a novel approach using LED light for microalgal biotechnology.
authors.affiliation: Department of Bioprocess Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.
authors.forename: Dae Geun
authors.initials: DG
authors.lastname: Kim
authors.affiliation: Department of Bioprocess Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea.
authors.forename: Changsu
authors.initials: C
authors.lastname: Lee
authors.affiliation: Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan-si, Jeollabuk-do 570-752, Republic of Korea.
authors.forename: Seung-Moon
authors.initials: SM
authors.lastname: Park
authors.affiliation: LED Agri-bio Fusion Technology Research Center, Chonbuk National University, 79 Gobong-ro, Iksan-si, Jeollabuk-do 570-752, Republic of Korea; Department of Bioactive Material Sciences, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea. Electronic address: yechoi@jbnu.ac.kr.
authors.forename: Yoon-E
authors.initials: YE
authors.lastname: Choi
mesh_terms: D056804:Biofuels / Q000382:microbiology; D018533:Biomass; D048429:Cell Size / Q000528:radiation effects; D048408:Chlorella vulgaris / Q000166:cytology / Q000254:growth & development* / Q000528:radiation effects*; D002734:Chlorophyll / Q000378:metabolism; D004952:Esters / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism*; D008027:Light; D008954:Models, Biological; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D056804:Biofuels; D004952:Esters; D005227:Fatty Acids; D017382:Reactive Oxygen Species; D002734:Chlorophyll
keywords: Biodiesel; Chlorella vulgaris; LED; Microalgal cultivation; Wavelength shift