Exogenous carbon source and phytohormone supplementation enhanced growth rate and metabolite production in freshwater microalgae Scenedesmus obtusus Meyen

Vijay, Aravind K.; Salim, Said Ali M.; Prabha, Syama; George, Basil

doi:10.1016/j.biteb.2021.100669

Cited by 23 publications

(6 citation statements)

References 47 publications

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“…The biomass, carbohydrate, and lipid productivity are crucial factors to optimize or enhance the economic viability of microalgae-based biofuels. Changes in medium ingredients or growing conditions can easily increase the biomass content of microalgae resulting in a greater yield of value-added products ( Vijay et al, 2021 ; Siddiki et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

“…Several strains of freshwater microalgae Scenedesmus and Chlorella have been documented as potential candidates for the large-scale production of biofuel owing to its high biomass productivity and favorable biochemical composition. In addition, the ability to modulate their metabolic productivity under varying nutritional conditions, which showed significant morphological variability and phenotypic plasticity in response to changing environmental factors ( Chung et al, 2018 ; Yun et al, 2019 ; Vijay et al, 2021 ). Microalgal biomass production on a large-scale is difficult as is microalgal strains that can develop robustly under stress conditions.…”

Section: Introductionmentioning

confidence: 99%

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Physiological and Biochemical Responses of Bicarbonate Supplementation on Biomass and Lipid Content of Green Algae Scenedesmus sp. BHU1 Isolated From Wastewater for Renewable Biofuel Feedstock

et al. 2022

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In the present study, different microalgae were isolated from wastewater environment and evaluated for higher growth and lipid accumulation. The growth adaptability of all the isolated microalgae were tested for carbon source with supplementation of sodium bicarbonate in BG-11 N+ medium. Further based on the uptake rate of sodium bicarbonate and growth behavior, microalgal strains were selected for biofuel feedstock. During the study, growth parameters of all the isolates were screened after supplementation with various carbon sources, in which strain Scenedesmus sp. BHU1 was found highly effective among all. The efficacy of Scenedesmus sp. BHU1 strain under different sodium bicarbonate (4–20 mM) concentration, in which higher growth 1.4 times greater than control was observed at the concentration 12 mM sodium bicarbonate. In addition, total chlorophyll content (Chl-a + Chl-b), chlorophyll fluorescence (Fv/Fm, Y(II), ETR max, and NPQmax), and biomass productivity were found to be 11.514 μg/ml, 0.673, 0.675, and 31.167 μmol electrons m−2 s−1, 1.399, 59.167 mg/L/day, respectively, at the 12 mM sodium bicarbonate. However, under optimum sodium bicarbonate supplementation, 56.920% carbohydrate and 34.693% lipid content were accumulated, which showed potential of sodium bicarbonate supplementation in renewable biofuel feedstock by using Scenedesmus sp. BHU1 strain.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physiological and Biochemical Responses of Bicarbonate Supplementation on Biomass and Lipid Content of Green Algae Scenedesmus sp. BHU1 Isolated From Wastewater for Renewable Biofuel Feedstock

et al. 2022

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“…Some are adapted to high carbonaceous environments, while others do not tolerate high levels of this ion, which in turn may synthesize more or carbohydrates, lipids, or even proteins. In a recent study, Vijay et al [60] found that the addition of NaHCO 3 substantially increased the protein content in S. obtusus. Since the first two are the goal for many studies, the last may hinder the thermal efficiency of the biomass produced [61][62][63][64][65].…”

Section: Discussionmentioning

confidence: 95%

Application of Chlorella sp. and Scenedesmus sp. in the Bioconversion of Urban Leachates into Industrially Relevant Metabolites

et al. 2022

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This paper explores the ability of Chlorella sp. and Scenedesmus sp. to convert landfill leachates into usable metabolites. Different concentrations (0.5, 1, 5, and 10% v/v) of leachate coupled with an inorganic carbon source (Na2CO3, and NaHCO3) were tested to improve biomass production, metabolites synthesis, and removal of NO3 and PO4. The result shows that both strains can effectively grow in media with up to 5% (v/v) leachate, while significantly reducing the concentrations of NO3, and PO4 (80 and 50%, respectively). The addition of NaHCO3 as a carbon source improved the final concentration of biomass, lipids, carbohydrates, and the removal of NO3 and PO4 in both strains.

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“…Despite the augmented expenses incurred by the incorporation of phytohormones into the growth medium for microalgal cultures, extant research posits that judicious adjustments in supplementation and cultivation methodologies may yield cost savings while concurrently augmenting biomass and biomolecule output [15,16,24,38,72]. The accomplishment of a cost reduction exceeding fifty percent in the production of biomass and biomolecules constitutes a significant milestone.…”

Section: Discussionmentioning

confidence: 99%

“…Despite the extensive literature documenting the impact of phytohormone stimulation on microalgae biomass and biomolecule productivity [15,16,18,[20][21][22][23][24], no research to date has explored the role of phytohormones within outdoor microalgae cultivation systems employing nonsterile media and operating on a larger scale [25].…”

Section: Introductionmentioning

confidence: 99%

Indole-3-Acetic Acid Action in Outdoor and Indoor Cultures of Spirulina in Open Raceway Reactors

Silveira,

Rosa,

Morais

et al. 2024

Applied Sciences

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A significant research gap exists in investigating large-scale microalgae cultures exposed to outdoor conditions, with the addition of phytohormones using non-sterile growth media. Implementing these conditions is crucial for verifying the industrial viability of this strategy. This study aimed to evaluate the effect of indole-3-acetic acid (IAA) supplementation on Spirulina sp. LEB 18 cultures conducted indoors and outdoors in raceway bioreactors. The outdoor experiments were performed under uncontrolled environmental conditions. The indoor cultures were maintained within a thermostat-controlled chamber at a consistent temperature and lighting intensity. The outdoor experiments supplemented with IAA achieved a biomass concentration of 5.43 g L−1 and productivity of 173.9 mg L−1 d−1. These values increased 122.5% and 130.9% in biomass concentration and productivity, respectively, compared to the indoor experiments with the same supplementation. Moreover, roughly half of the biomass generated from outdoor cultivation with IAA consisted of carbohydrates (45%). Compared to indoor cultivation, this approach reduced production costs for biomass (55%) and lowered production costs for carbohydrates, proteins, and lipids by 86%, 44%, and 50%, respectively. The successful application of phytohormones in microalgae cultures, particularly under larger scale, nonsterile, and outdoor conditions, represents a significant advancement toward industrial implementation.

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Exogenous carbon source and phytohormone supplementation enhanced growth rate and metabolite production in freshwater microalgae Scenedesmus obtusus Meyen

Cited by 23 publications

References 47 publications

Physiological and Biochemical Responses of Bicarbonate Supplementation on Biomass and Lipid Content of Green Algae Scenedesmus sp. BHU1 Isolated From Wastewater for Renewable Biofuel Feedstock

Physiological and Biochemical Responses of Bicarbonate Supplementation on Biomass and Lipid Content of Green Algae Scenedesmus sp. BHU1 Isolated From Wastewater for Renewable Biofuel Feedstock

Application of Chlorella sp. and Scenedesmus sp. in the Bioconversion of Urban Leachates into Industrially Relevant Metabolites

Indole-3-Acetic Acid Action in Outdoor and Indoor Cultures of Spirulina in Open Raceway Reactors

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