Night illumination using monochromatic light-emitting diodes for enhanced microalgal growth and biodiesel production

Abomohra, Abd El‐Fatah; Shang, Hao; El‐Sheekh, Mostafa M.; Eladel, Hamed; Ebaid, Reham; Wang, Shuang; Wang, Qian

doi:10.1016/j.biortech.2019.121514

Cited by 69 publications

(25 citation statements)

References 38 publications

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“…Lipids are a very attractive feedstock for biofuel production because of their high energy content and easy transforming to biodiesel [ 18 ]. The fatty acid composition of the algal lipids is a significant determinant of the biodiesel quality [ 19 ]. The most important properties of biofuel, such as cetane number and kinematic viscosity, are highly associated with the structural features of fatty acids [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Molecular identification, biomass, and biochemical composition of the marine chlorophyte Chlorella sp. MF1 isolated from Suez Bay

El‐Sheekh

Abu-Faddan

Abo-Shady

et al. 2020

Journal of Genetic Engineering and Biotechnology

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Background An Egyptian indigenous unicellular green microalga was isolated from the coastal water of Suez Bay (N 29.92°, E 32.473°), Red Sea, Egypt. The molecular analysis based on 18S rRNA sequence showed that the gene sequence for this strain was highly similar (100% identity and 98% query cover) to different Chlorella strains isolated from different habitats. Results The observed morphological characters together with the molecular phylogeny assigned the isolated microalga as Chlorella sp. MF1 with accession number KX228798. This isolated strain was cultivated for estimation of its growth and biochemical composition. The mean specific growth rate ( μ ) was 0.273 day −1 . Both the biomass productivity and the cellular lipid content increased by increasing salinity of the growth medium, recording a maximum of 6.53 g DW l −1 and 20.17%, respectively, at salinity 40.4. Fourteen fatty acids were identified. The total saturated fatty acid percentage was 54.73% with stearic (C18:0), arachidic (C20:0), and palmitic acids (C16:0) as major components, while the total unsaturated fatty acid percentage was 45.27% with linoleic acid (C18:2c) and oleic acid (C18:1) as majors. Conclusion This algal strain proved to be a potential newly introduced microalga as one of the most proper options available for microalgae-based biodiesel production. The proximate analysis showed the protein content at 39.85% and carbohydrate at 23.7%, indicating its accessibility to various purposes.

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Section: Introductionmentioning

confidence: 99%

Molecular identification, biomass, and biochemical composition of the marine chlorophyte Chlorella sp. MF1 isolated from Suez Bay

El‐Sheekh

Abu-Faddan

Abo-Shady

et al. 2020

Journal of Genetic Engineering and Biotechnology

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“…Previous researchers studied the effects of abiotic stress on microalgal growth in efforts to enhance biomass and lipid accumulation [ 16 , 25 , 35 ]. Different abiotic stressors can lead to changes in physiological and biochemical processes [ 36 ] and stimulate production of antioxidants [ 17 ], leading to changes in morphology and growth.…”

Section: Resultsmentioning

confidence: 99%

Improvement of Chemical Composition of Tisochrysis lutea Grown Mixotrophically under Nitrogen Depletion towards Biodiesel Production

Al-Mutairi

2020

Molecules

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In the present study, the marine microalga Tisochrysis lutea was cultivated mixotrophically in F2 growth medium with sodium acetate as exogenous carbon source. The medium was composed of different concentrations of nitrogen to determine the impact of nitrogen depletion on cellular growth and chemical composition. Nitrogen depletion led to severely decreased growth and protein content. However, mild nitrogen depletion (0.22 mM NaNO3) led to maximum lipid yield. The fatty acid methyl ester profile also showed increased unsaturation as the nitrogen content decreased. Growth in nitrogen-free medium increased the proportions of mono- and poly-unsaturated fatty acids, while the proportion of saturated fatty acids decreased. Growth under all tested nitrogen levels showed undetectable fatty acids with ≥4 double bonds, indicating these fatty acids had oxidative stability. In addition, all tested nitrogen concentrations led to specific gravity, kinematic viscosity, iodine value, and cetane number that meet the standards for Europe and the U.S.A. However, growth in the presence of nitrogen deficiency enhanced the higher heating value of the resulting biodiesel, a clear advantage from the perspective of energy efficiency. Thus, mixotrophic cultivation of T. lutea with nitrogen limitation provides a promising approach to achieve high lipid productivity and production of high-quality biodiesel.

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“…3) (p < 0.05), indicating that HS stress does not promote lipid accumulation in D. salina Y6. In general, lipid accumulation increased significantly in microalgae under HL, ND, and HS conditions (Abomohra et al 2019;Abomohra et al 2020;Monte et al 2020;Paliwal et al 2017). Nevertheless, the final lipid contents under HL, ND, and HS conditions were not considerably greater than that of the control group, potentially indicating that the stress treatments did not promote lipid production in D. salina Y6.…”

Section: Fatty Acid Composition and Accumulationmentioning

confidence: 85%

“…The unicellular green microalga Dunaliella salina (Chlorophyta) is rich in β-carotene, which accumulates at approximately 5-10 mg/L dry weight under suitable growth conditions, similar to other higher plants, fungi, and bacteria (Ku et al 2019;Miller et al 2013;Yen et al 2019). However, D. salina produces a large amount of β-carotene, up to 10% cellular dry weight, under abiotic-stress conditions such as high light (HL), nitrogen depletion (ND), high salt (HS), and low temperature (Abomohra et al 2019;Abomohra et al 2020;Mai et al 2017;Nguyen et al 2016;Zarandi-Miandoab et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Effects of different abiotic stresses on carotenoid and fatty acid metabolism in the green microalga Dunaliella salina Y6

Zhu

et al. 2020

Ann Microbiol

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Purpose: Under different abiotic-stress conditions, the unicellular green microalga Dunaliella salina accumulates large amounts of carotenoids which are accompanied by fatty acid biosynthesis. Carotenoids and fatty acids both possess long carbon backbones; however, the relationship between carotenoid and fatty acid metabolism is controversial and remains poorly understood in microalgae. Methods: In this study, we investigated the growth curves and the β-carotene, lutein, lipid, and fatty acid contents of D. salina Y6 grown under different abiotic-stress conditions, including high light, nitrogen depletion, and high salinity. Results: Both high-salinity and nitrogen-depleted conditions significantly inhibited cell growth. Nitrogen depletion significantly induced β-carotene accumulation, whereas lutein production was promoted by high light. The accumulation of lipids did not directly positive correlate with β-carotene and lutein accumulation under the three tested abiotic-stress conditions, and levels of only a few fatty acids were increased under specific conditions. Conclusion: Our data indicate that cellular β-carotene accumulation in D. salina Y6 positive correlates with accumulation of specific fatty acids (C16:0, C18:3n3, C14:0, and C15:0) rather than with total fatty acid content under different abiotic stress conditions.

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Night illumination using monochromatic light-emitting diodes for enhanced microalgal growth and biodiesel production

Cited by 69 publications

References 38 publications

Molecular identification, biomass, and biochemical composition of the marine chlorophyte Chlorella sp. MF1 isolated from Suez Bay

Molecular identification, biomass, and biochemical composition of the marine chlorophyte Chlorella sp. MF1 isolated from Suez Bay

Improvement of Chemical Composition of Tisochrysis lutea Grown Mixotrophically under Nitrogen Depletion towards Biodiesel Production

Effects of different abiotic stresses on carotenoid and fatty acid metabolism in the green microalga Dunaliella salina Y6

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