Influence of nutrient deprivations on lipid accumulation in a dominant indigenous microalga Chlorella sp., BUM11008: Evaluation for biodiesel production

Praveenkumar, Ramasamy; Shameera, Kalifulla; Mahalakshmi, G.; Akbarsha, Mohammad Abdulkader; Thajuddin, Nooruddin

doi:10.1016/j.biombioe.2011.12.035

Cited by 168 publications

(70 citation statements)

References 18 publications

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“…[23,25], Tetraselmis suecica [23], Chlorella vulgaris [2,12,26,27], Chlorella sp. [28], Chlorella minutissima [29], Phaeodactylum tricornutum [30], Dunaliella tertiolecta [1], and Neochloris oleabundans [25]. The increase in microalgal lipid content, corresponding to a decrease in nitrate in the culture medium has been attributed to the fact that when nitrogen is limited, photosynthetically derived energy (normally channeled into producing more cells and therefore more proteins) is in part diverted into making storage products such as carbohydrates and lipids, most of which lack nitrogen [31].…”

Section: Effect Of Nitrate On Lipid Production By Microalgaementioning

confidence: 99%

Effect of nitrate on lipid production by T. suecica, M. contortum, and C. minutissima

et al. 2013

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Abstract:Microalgae are an alternative and sustainable source of lipids that can be used as a feedstock for biodiesel production. Nitrate is a good nitrogen source for many microalgae and affects biomass and lipid yields of microalgae. In this study, the effect of nitrate on cell growth and lipid production and composition in Monoraphidium contortum, Tetraselmis suecica, and Chlorella minutissima was investigated. Nitrate affected the production of biomass and the production and composition of lipids of the three microalgae tested. Increasing the nitrate concentration in the culture medium resulted in increased biomass production and higher biomass productivity. Furthermore, increasing the nitrate concentration resulted in a reduction in lipid content and productivity in M. contortum; however, the opposite effect was observed in T. suecica and C. minutissima cultures. diesel infrastructure for storage and distribution. Biodiesel offers several advantages over petroleumbased diesel. For example, biodiesel is a renewable and biodegradable energy resource, it produces fewer toxic emissions (carbon monoxide, aromatic compounds, hydrocarbons, particulate matter, sulfur oxides, nitrogen oxides, and metals), it is less volatile and safer to transport, store and handle, and it increases efficiency, reduces wear, and extends engine life [2,3].Currently, biodiesel is produced from vegetable oils (edible or inedible), waste oils, and animal fats. However, this practice has raised serious concerns in the international community regarding the production, price, and availability of food. Other concerns include the deforestation of large areas of land that could be used to grow oleaginous vegetables, the huge amounts of water needed for irrigation, and the inability of these biodiesel sources to meet current and future fuel demands [4,5]. A sustainable biodiesel industry needs alternative raw materials that can be obtained easily from alternative renewable and biodegradable sources, allowing continuous operation and avoiding the limitations described [6].Currently, there is a consensus that microalgae are an alternative and sustainable source of lipids that can be used as a feedstock for biodiesel production. Microalgae are suitable for this purpose because they are photosynthetic microorganisms with a simple cellular structure and are easy to culture. Furthermore, microalgae grow in a variety of environments, their growth rate is 20 to 30 times faster than other sources of biofuels, they exhibit high photosynthetic efficiency, contribute greatly to the sequestration of atmospheric CO 2 , thereby mitigating climate change, can be harvested 365 days a year, can be grown in areas unsuitable for agriculture, livestock, industry, or tourism, require smaller volumes of water than oleaginous plants and can use water unsuitable for human consumption, their intracellular lipid content is high and the productivity of lipids per unit area is considerably higher than that of oleaginous plants [7][8][9][10].Several studies have shown that...

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Section: Effect Of Nitrate On Lipid Production By Microalgaementioning

confidence: 99%

Effect of nitrate on lipid production by T. suecica, M. contortum, and C. minutissima

et al. 2013

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“…Conversely, during periods of reduced nitrogen availability there is an accumulation of carbohydrate and a decrease of protein production (Silva et al, 2009). The lipid content also tends to increase under nitrogen limitation (Praveenkumar et al, 2012). Higher values of protein were found in the exponential growth phase, under sufficiency in nitrogen (see the previous discussion on dissolved nutrients), decreasing in the stationary growth phase.…”

Section: Gross Chemical Compositionmentioning

confidence: 95%

“…On the other hand, increments in lipid productivity may be attained through proper induction, such as that represented by nitrogen deprivation (Rodolfi et al, 2009;Praveenkumar et al, 2012). Previous studies performed with the cyanobacterium Synechococcus subsalsus revealed high growth rates, despite its lipid content is relatively low (Lourenço et al, 2002.…”

Section: Introductionmentioning

confidence: 99%

An assessment of the usefulness of the cyanobacterium Synechococcus subsalsus as a source of biomass for biofuel production

Setta¹,

Barbarino²,

Passos³

et al. 2014

lajar

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ABSTRACT. Nowadays algal biofuels are considered one of the most promising solutions of global energy crisis and climate change for the years to come. By manipulation of the culture conditions, many algal species can be induced to accumulate high concentrations of particular biomolecules and can be directed to the desired output for each fuel. In this context, the present study involved the assessment of the effects of CO 2 availability and nitrogen starvation on growth and chemical composition of the cyanobacterium Synechococcus subsalsus, testing a fast-growing native strain. The control experiments were performed with Conway culture medium in 12-day batch cultures, in 6-liter flasks and 12 h photoperiod, with addition of 2 L min -1 filtered air to each flask. Other two experimental conditions were also tested: (i) the placement into the cultures of additional dissolved nutrients except nitrogen, one week after the start of growth (N-), and (ii) the input of pure CO 2 into the flasks from the 5 th day of growth (C+). In all cultures, daily cell counts were done throughout the cultivation, as well as measurements of pH and cell biovolumes. Maximum cell yield were found in N-experiments, while cell yields of C+ and control were similar. Dissolved nitrogen was exhausted before the end of the experiments, but dissolved phosphorus was not totally consumed. Protein and chlorophyll-a concentrations decreased from the exponential to the stationary growth phase of all experiments, except for protein in the control. In all experiments, carbohydrate, lipid and total carotenoid increased from the exponential to the stationary growth phase, as an effect of nitrogen limitation. Increments in carbohydrate concentrations were remarkable, achieving more than 42% of the dry weight (dw), but concentrations of lipid were always lower than 13% dw. The addition of pure CO 2 did not cause a significant increase in biomass of S. subsalsus nor generated more lipid and carbohydrate than the other treatments. Nitrogen starvation caused an intense accumulation of carbohydrate, but the increments of lipid were small. Despite the fast growth, the cyanobacterium S. subsalsus has a virtually null potential for biodiesel production, given its low lipid concentrations. The high concentrations of carbohydrate combined with fast growth point to the potential use of this species as raw material for other possible biotechnological processes, after a demonstration of technical and economic viability. Keywords: biodiesel, biomass, cultivation, lipid, microalgae, cyanobacteria, productivity.Evaluación de la utilidad de la cianobacteria marina Synechococcus subsalsus como fuente de biomasa para la producción de biocombustibles RESUMEN. Actualmente los biocombustibles elaborados con algas se consideran una de las soluciones más prometedoras de la crisis energética mundial y el cambio climático para los años venideros. Mediante la manipulación de las condiciones de cultivo, muchas especies de algas pueden ser inducidas para acumular altas concentracione...

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“…Growth rate of the alga under different culture conditions were monitored following the values given by Praveenkumar et al (2012b). The initial pH and salinity was measured.…”

Section: Introductionmentioning

confidence: 99%

Bioethanol Production Using Starch Extracted from Microalga Stigeoclonium sp., Kutz. BUM11007 Cultivated in Domestic Wastewater

LewisOscar¹,

Praveenkum²,

Thajuddin³

2015

Research J. of Environmental Sciences

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Influence of nutrient deprivations on lipid accumulation in a dominant indigenous microalga Chlorella sp., BUM11008: Evaluation for biodiesel production

Cited by 168 publications

References 18 publications

Effect of nitrate on lipid production by T. suecica, M. contortum, and C. minutissima

Effect of nitrate on lipid production by T. suecica, M. contortum, and C. minutissima

An assessment of the usefulness of the cyanobacterium Synechococcus subsalsus as a source of biomass for biofuel production

Bioethanol Production Using Starch Extracted from Microalga Stigeoclonium sp., Kutz. BUM11007 Cultivated in Domestic Wastewater

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