The Use of Light Spectra to Improve the Growth and Lipid Content of Chlorella vulgaris for Biofuels Production

Abstract

The effects of light spectra on cell concentration, cell size, biomass production, proximate composition, pigment content, and fatty acid content in Chlorella vulgaris during two growth phases were measured. Growth rates were higher with white (0.70 division day−1) and blue light (0.67 divisions day−1). Cell size was greater in the exponential growth with yellow light (16.29 μm) versus blue light (14.26 μm). Higher organic dry weight (ODW) values were observed during exponential growth under green light (70.58 pg cell−1) compared with white light (36.56 pg cell−1). Proximate composition differed significantly by effect of light spectra and growth phases. Protein content was significantly higher in the exponential growth with white light (34.42%) and green (31.64%) light. Carbohydrate levels were significantly higher during stationary growth under yellow light (27.05%). In the exponential growth, lipid content was significantly higher with blue light (18.74%). Biomass productivity was highest in exponential growth phase with blue light (0.064 gL-1 day-1), meanwhile, in stationary growth phase yellow light (0.031 gL-1 day-1). Chlorophyll a and carotenoid levels were significantly greater during exponential growth with green and yellow lights. Fatty acid content was significantly modified by the light spectra and growth phase. The predominant saturated fatty acid was C:16:0 (palmitic acid), ranging between 10.26 (green light and exponential growth) and 20.01% (white light and stationary growth). The content of C18:1n-9 was higher (28.34 %) with the white light in the stationary growth, and C18:3n-3 content was greater with white (41.41%) and blue light (40.82%) in the exponential growth. It was concluded that blue light is the most suitable condition to induce biomass productivity and lipid content on both growth phases. Blue light during the stationary growth phase induces the production of lipids and saturated fatty acids (SFAs) which are suitable for biodiesel production.

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Fig. 1

Abbreviations

μ:

Growth rate (divisions day-1)

Log2 :

Logarithm base 2

TDW:

Total dry weight (pg cell-1)

ODW:

Organic dry weight (pg cell-1)

BPD:

Biomass productivity by day (g L-1 day-1)

BPT:

Biomass productivity total (g L-1 8 day-1)

E:

Exponential growth

S:

Stationary growth

SFA:

Saturated fatty acid

MUFA:

Monounsaturated fatty acid

PUFA:

Polyunsaturated fatty acid

FAMEs:

Fatty acid methyl esters

RU:

Relation of total unsaturated fatty acids. RU = ∑MUFA+∑PUFA

RSU:

Relation RSU of total saturated fatty acids (SFAs) to total unsaturated fatty acids (UFAs). RSU = ∑SFAs/∑MUFA+∑PUFA

CN:

Cetane number

ρ:

Density (g cm-3)

MW:

Molecular weight (g mol-1)

Mp:

Melting point (°C)

Bp:

Boiling point (°C)

CAS:

Register number of chemicals

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Funding

This work was funded by “Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE),” the Fund for Scientific Research and Technological Development of CICESE Call 2015 (Project: 623801).

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Authors

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M.P.S.S. wrote and organized the project, designed and supervised the research, and wrote the manuscript. D.S.C. wrote the project and revised the manuscript. F.Y.C.O. performed the experiments, obtained the data for all the experiments, and analyzed the data. C.A.M.C. helped to obtain data of cell counts and lipids profiles.

Corresponding author

Correspondence to M. del Pilar Sánchez-Saavedra.

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Sánchez-Saavedra, M., Sauceda-Carvajal, D., Castro-Ochoa, F.Y. et al. The Use of Light Spectra to Improve the Growth and Lipid Content of Chlorella vulgaris for Biofuels Production. Bioenerg. Res. 13, 487–498 (2020). https://doi.org/10.1007/s12155-019-10070-1

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Keywords

  • Chlorella vulgaris
  • Light spectra
  • Growth rate
  • Pigments
  • Fatty acids
  • Biodiesel