Effect of nitrogen concentration on lipid productivity and fatty acid composition of Monoraphidium sp.

Dhup, Saumya; Dhawan, Vibha

doi:10.1016/j.biortech.2013.11.068

Cited by 57 publications

(28 citation statements)

References 7 publications

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“…Ferriols 14 observed that although the difference between the removal efficiencies of nitrogen with varying phosphorus was not significant, there was a slight increase in nitrogen uptake rate with elevated levels of phosphorus. Therefore, from these and the previous study 11 , it can be inferred that in both cases (varying phosphorus and nitrogen concentration), nitrogen is the major source of nutrient which is taken up first when present in optimum amounts. In the absence of nitrogen, phosphorus, considered the next best optimum source is taken up; therefore, it acts as a replacement nutrient to negate the nutrient stress caused to the cell.…”

Section: Effect Of Phosphorus Concentrations On Nutrient Removal By Msupporting

confidence: 54%

“…In a previous study 11 , it was reported that lower nitrogen concentration led to an increased removal of phosphorus from the medium, suggesting that nitrogen concentration has a significant effect on phosphorus usage. This observation was further investigated to obtain more information on whether phosphorus removal increased as a result of replacement of nitrogen or is it an equally important nutrient needed for growth and metabolism of the cells.…”

Section: Effect Of Phosphorus Concentrations On Nutrient Removal By Mmentioning

confidence: 93%

“…At concentration 0.1 g/l, an evident decline in growth rate and dry weight concentration of cells was observed (Table 1 and Figure 1 b). From this, it can be inferred that increasing concentration of the nutrient beyond a limit results in toxicity for the cells, leading to decrease in growth and metabolism 11 . The medium with 0.005 g/l phosphorus concentration showed an increase in biomass productivity by 66% in 23 days compared to control and medium with concentration of di-potassium phosphate -0.001 g/l (0.5 mg/l of phosphate) showed an increase of 33%.…”

Section: Effect Of Phosphorus Concentrations On Growth Kineticsmentioning

confidence: 99%

“…A concentration of 0.5 g/l of sodium nitrate was used in the medium. This concentration was optimized in a previous study 11 . A preincubation step was carried out to negate the carry-over effect of the strain on the experiment.…”

Section: Methodsmentioning

confidence: 99%

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Growth, Lipid Productivity and Cellular Mechanism of Lipid Accumulation in Microalgae <i>Monoraphidium</i> sp. Following Different Phosphorous Concentrations for Biofuel Production

Dhup¹,

Kannan²,

Dhawan³

2017

Current Science

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Stress to an algal species can be caused by several factors ranging from temperature extremes to varying light intensities under which they accumulate lipids. Stress caused by nutrient limitation is known to induce maximum lipid accumulation in microalgae. In order to obtain an appropriate phosphate concentration exhibiting both high biomass and high lipid contents, four different concentrations of phosphate were implemented. Mechanism of lipid accumulation was also studied. Of the tested concentrations, no significant difference between growth rates was observed. Cultures with phosphate concentration 2.7 mg/l exhibited maximum increase in biomass productivity compared to control. But phosphate concentration 0.5 mg/l demonstrated the highest lipid productivity (8.75 mg/l/day), in accordance with lipid content (21.8%). Further, representation of TEM and fluorescent microscopic images depicted differences in lipid accumulation and sub-cellular ultrastructure at different concentrations of phosphate. Disappearance of phosphate and nitrate from the medium was also evaluated to study the efficient nutrient concentration and to better understand mechanism of lipid enhancement.

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Section: Effect Of Phosphorus Concentrations On Nutrient Removal By Msupporting

confidence: 54%

Section: Effect Of Phosphorus Concentrations On Nutrient Removal By Mmentioning

confidence: 93%

Section: Effect Of Phosphorus Concentrations On Growth Kineticsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Growth, Lipid Productivity and Cellular Mechanism of Lipid Accumulation in Microalgae <i>Monoraphidium</i> sp. Following Different Phosphorous Concentrations for Biofuel Production

Dhup¹,

Kannan²,

Dhawan³

2017

Current Science

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“…A study of Monoraphidium sp. T4X cultured by Dhup and Dhawan [21] grown in BG11 for 15 d showed a similar characteristic of algae growth to FXY-10, with <l g L À1 in biomass concentration. In morphology SDEC-17 was twice as big as FXY-10, with cell length ranging from 11 to 18 lm and width ranged from 1 to 4 lm, although SDEC-17 is close to FXY-10 isolated by…”

Section: Growth Properties Of Monoraphidium Sp Sdec-17mentioning

confidence: 90%

Biomass production and nutrient assimilation by a novel microalga, Monoraphidium spp. SDEC-17, cultivated in a high-ammonia wastewater

Jiang

Pei

et al. 2016

Energy Conversion and Management

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Effect of nitrate feeding strategies on lipid and biomass productivities in fed‐batch cultures of Nannochloropsis gaditana

Devasya

Bassi

2021

Biotechnology Progress

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Controlled nitrate feeding strategies for fed-batch cultures of microalgae were applied for the enhancement of lipid production and microalgal growth rates. In particular, in this study, the effect of nitrate feeding rates on lipid and biomass productivities in fed-batch cultures of Nannochloropsis gaditana were investigated using three feeding modes (i.e., pulse, continuous, and staged) and under two light variations on both lipid productivity and fatty acid compositions. Higher nitrate levels negatively affected lipid production in the study. Increasing the light intensity increased the lipid contents of the microalgae in all three fed-batch feeding modes. A maximum of 58.3% lipid-to dry weight ratio was achieved when using pulse-fed cultures at an illumination of 200 μmol photons m −2 s −1 and 10 mg/day of nitrate feeding. This condition also resulted in the maximum lipid productivity of 44.6 mg L −1 day −1 . The fatty acid compositions of the lipids consisted predominantly of long-chain fatty acids (C:16 and C:18) and accounted for 70% of the overall fatty acid methyl esters. Pulse feeding mode was found to significantly enhance the biomass and lipid production.The other two feeding modes (continuous and staged) were not ideal for lipid and biomass production. This study demonstrates the applicability of pulse feeding strategies in fed-batch cultures as an appropriate cultivation strategy that can increase both lipid accumulation and biomass production.

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Effect of nitrogen concentration on lipid productivity and fatty acid composition of Monoraphidium sp.

Cited by 57 publications

References 7 publications

Growth, Lipid Productivity and Cellular Mechanism of Lipid Accumulation in Microalgae <i>Monoraphidium</i> sp. Following Different Phosphorous Concentrations for Biofuel Production

Growth, Lipid Productivity and Cellular Mechanism of Lipid Accumulation in Microalgae <i>Monoraphidium</i> sp. Following Different Phosphorous Concentrations for Biofuel Production

Biomass production and nutrient assimilation by a novel microalga, Monoraphidium spp. SDEC-17, cultivated in a high-ammonia wastewater

Effect of nitrate feeding strategies on lipid and biomass productivities in fed‐batch cultures of Nannochloropsis gaditana

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