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Fatty Acid Characterization and Biodiesel Production by the Marine Microalga Asteromonas gracilis: Statistical Optimization of Medium for Biomass and Lipid Enhancement

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Abstract

Lipid production is an important indicator for evaluating microalgal species for biodiesel production. In this study, a new green microalga was isolated from a salt lake in Egypt and identified as Asteromonas gracilis. The main parameters such as biomass productivity, lipid content, and lipid productivity were evaluated in A. gracilis, cultivated in nutrient-starved (nitrogen, phosphorous), and salinity stress as a one-factor-at-a-time method. These parameters in general did not vary significantly from the standard nutrient growth media when these factors were utilized separately. Hence, response surface methodology (RSM) was assessed to study the combinatorial effect of different concentrations of the abovementioned factor conditions and to maximize the biomass productivity, lipid content, and lipid productivity of A. gracilis by determining optimal concentrations. RSM optimized media, including 1.36 M NaCl, 1 g/L nitrogen, and 0.0 g/L phosphorus recorded maximum biomass productivity, lipid content, and lipid productivity (40.6 mg/L/day, 39.3%, and 15.9 mg/L/day, respectively) which agreed well with the predicted values (40.1 mg/L/day, 43.6%, and 14.6 mg/L/day, respectively). Fatty acid profile of A. gracilis was composed of C16:0, C16:1, C18:0, C18:3, C18:2, C18:1, and C20:5, and the properties of fuel were also in agreement with international standards. These results suggest that A. gracilis is a promising feedstock for biodiesel production.

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Authors and Affiliations

  1. Faculty of Science, Botany and Microbiology Department, Assiut University, Assiut, 71516, Egypt

    Mustafa A. Fawzy

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  1. Mustafa A. Fawzy
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Correspondence to Mustafa A. Fawzy.

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Glossary

C16:0

palmitic acid.

C16:1 ω-7

palmitoleic acid.

C18:0

stearic acid.

C18:1 ω-9

oleic acid.

C18:2 ω-6

linoleic acid.

C18:3 ω-3

linolenic acid.

C20:5 ω-3

eicosapentaenoic acid (EPA).

CN

cetane number.

CV

variation coefficient.

HHV

higher heating value (MJ/kg).

IV

iodine value (g I2 100 g−1 fat).

SV

saponification value (mg/KOH/g).

ρ

oil density (gcm−3).

υ

kinematic viscosity (mm2/s).

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Fawzy, M.A. Fatty Acid Characterization and Biodiesel Production by the Marine Microalga Asteromonas gracilis: Statistical Optimization of Medium for Biomass and Lipid Enhancement. Mar Biotechnol 19, 219–231 (2017). https://doi.org/10.1007/s10126-017-9743-y

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  • DOI: https://doi.org/10.1007/s10126-017-9743-y

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