Cited by 227Algal biology and biofuel productionAquaculture Nutrition and GrowthMarine and coastal ecosystems

Effect of nitrogen concentration on the growth rate and biochemical composition of the microalga, Isochrysis galbana

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Zarrinmehr, Mohammad Javad, Farhadian, Omidvar, Heyrati, Fatemeh Paykan, Keramat, Javad, Koutra, Eleni, Kornaros, Michael, Daneshvar, Ehsan·2020·Egyptian Journal of Aquatic Research

Abstract

Nitrogen represents a critical macronutrient that regulates the metabolism and consequently, the growth and biochemical composition of microalgae. In this study, the effect of different nitrogen concentrations (0, 36, 72, 144 and 288 mg/L) on the growth rate and biochemical composition of Isochrysis galbana was investigated. Cell growth, pigments and protein content of I. galbana biomass decreased with diminishing nitrogen concentration; while carbohydrates showed the highest value, 47%, in case of total nitrogen deprivation. Poly unsaturated fatty acids (PUFAs) increased five-fold under sufficient nitrogen concentrations (72 mg/L), compared to nitrogen deprivation. In contrast, concentration of saturated fatty acids (SFAs), 75.79% under nitrogen deprivation, was higher than in case of nitrogen sufficiency, 36.63%. The highest carbohydrate, protein and lipid productivities observed were 156.7, 326.2 and 264.6 mg/L under nitrogen concentrations of 72, 0 and 72 mg/L, respectively. The results of this study indicate that nitrogen concentration significantly affects the growth and biochemical compositions of I. galbana.

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Crossref · 10.1016/j.ejar.2019.11.003

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  • The maximum nitrogen content in the modified media in the analysed experiments was 0.494 g L−1, and the minimum was 0 g L−1.

    “The maximum nitrogen content in the modified media in the analysed experiments was 0.494 g L− 1 [68, 104], and the minimum was 0 g L− 1 [39].”

    From Nitrogen and phosphorus stress as a tool to induce lipid production in microalgae (2023) · cites this paper as [39]

    The citation to this paper is attached to the claimed maximum of 0.494 g/L. The Microalgal strain and medium preparation section lists the tested nitrogen concentrations as 0, 36, 72, 144, and 288 mg/L, making this paper’s maximum 0.288 g/L, not 0.494 g/L. The separate citation attached to the minimum is not assessed here. (LLM, conf=0.88)

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  • The slow growth of G. sulphuraria in half-strength CF-WW was due to nutrient, more specifically nitrogen, limitation.

    “Growth in half-strength CF-WW was slow presumably due to nutrient, more specifically nitrogen limitation (Pancha et al. 2014;Zarrinmehr et al. 2020).”

    From Quantification of phototrophically grown Galdieria sulphuraria and other microalgae using diphenylamine (2025) · cites this paper as Zarrinmehr et al. 2020

    The Discussion reports that low nitrogen concentrations limited growth of I. galbana, supporting nitrogen limitation as a plausible explanation for slow microalgal growth. The paper does not study G. sulphuraria or half-strength CF-WW, so it cannot establish that explanation for the conditions in the citing sentence. (LLM, conf=0.87)

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2 of the 37 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Tebbani, S., Filali, R., Lopes, F., Dumur, D., Pareau, D., 2014. CO 2 Biofixation by Microalgae: Modeling, Estimation and Control. John Wiley & Sons.

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Authors
Zarrinmehr, M. J., Farhadian, O., Heyrati, F. P., Keramat, J., Koutra, E., Kornaros, M., & Daneshvar, E.
Affiliations
  • Isfahan University of Technology (IR)
  • University of Patras (GR)
  • University of Eastern Finland (FI)
Corresponding author
Farhadian, Omidvar
Venue
Egyptian Journal of Aquatic Research
Publisher
Elsevier BV
Published
2020-06
Volume
46
Issue
2
Pages
153-158
ISSN
1687-4285 (ISSN-L)
OpenAlex
W2990955573
Cited by
227
References
37
Citations by year
2026: 27 · 2025: 47 · 2024: 44 · 2023: 42 · 2022: 44 · 2021: 20 · 2020: 3
FWCI
3.57
Type
journal article
Language
en
Open access
Locations
  • The Egyptian Journal of Aquatic Research (publishedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Ministry of Science Research and Technology
  • Isfahan University of Technology
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
Keywords
Isochrysis galbana, nitrogen content, nitrogen starvation, microalgae growth rate, biochemical composition, pigments, protein content, carbohydrates, polyunsaturated fatty acids, saturated fatty acids, lipid productivity, microalgal biomass

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