Integrated process of two stage cultivation of Nannochloropsis sp. for nutraceutically valuable eicosapentaenoic acid along with biodiesel

Mitra, Madhusree; Patidar, Shailesh Kumar; Mishra, Sandhya

doi:10.1016/j.biortech.2015.06.033

Cited by 60 publications

(32 citation statements)

References 32 publications

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“…In that case, higher PUFA levels would be measured in LL culture condition. It is consistent with numerous studies that suggest that PUFA content is inversely related to growth light intensity in most microalgae species [70][71][72][73][74][75].…”

Section: Effect Of Light Intensity On Antioxidant Activitysupporting

confidence: 92%

Impact of Light Intensity on Antioxidant Activity of Tropical Microalgae

Coulombier¹,

Nicolau

Déan

et al. 2020

Marine Drugs

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Twelve microalgae species isolated in tropical lagoons of New Caledonia were screened as a new source of antioxidants. Microalgae were cultivated at two light intensities to investigate their influence on antioxidant capacity. To assess antioxidant property of microalgae extracts, four assays with different modes of action were used: 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2'-azino-bis (3-éthylbenzothiazoline-6-sulphonique) (ABTS), oxygen radical absorbance capacity (ORAC), and thiobabituric acid reactive substances (TBARS). This screening was coupled to pigment analysis to link antioxidant activity and carotenoid content. The results showed that none of the microalgae studied can scavenge DPPH and ABTS radicals, but Chaetoceros sp., Nephroselmis sp., and Nitzschia A sp. have the capacity to scavenge peroxyl radical (ORAC) and Tetraselmis sp., Nitzschia A sp., and Nephroselmis sp. can inhibit lipid peroxidation (TBARS). Carotenoid composition is typical of the studied microalgae and highlight the siphonaxanthin, detected in Nephroselmis sp., as a pigment of interest. It was found that xanthophylls were the major contributors to the peroxyl radical scavenging capacity measured with ORAC assay, but there was no link between carotenoids and inhibition of lipid peroxidation measured with TBARS assay. In addition, the results showed that light intensity has a strong influence on antioxidant capacity of microalgae: Overall, antioxidant activities measured with ORAC assay are better in high light intensity whereas antioxidant activities measured with TBARS assay are better in low light intensity. It suggests that different antioxidant compounds production is related to light intensity.

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Section: Effect Of Light Intensity On Antioxidant Activitysupporting

confidence: 92%

Impact of Light Intensity on Antioxidant Activity of Tropical Microalgae

Coulombier¹,

Nicolau

Déan

et al. 2020

Marine Drugs

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“…N. oceanica on the other hand, similarly to S. limacinum can grow in marine and estuarial environments, including aquaculture wastewater (Jung & Lovitt, 2010). They are intensively investigated microorganisms (Mitra et al, 2015;Taisir et al, 2016). S. quadricuada species are frequently used in phycoremediation studies (Gonçalves et al;Kim et al, 2014), S. limacinum is being investigated due to its key feature of heterotrophic production of lipids such as poly-unsaturated fatty acids (PUFA), particularly omega-3 fatty acids, including docosahexaenoic acid (DHA) or eicosapentaenoic acid (EPA), that could be potentially used for nutrition, for example in aquaculture (Mitra et al, 2015Taisir et al, 2016.…”

Section: Introductionmentioning

confidence: 99%

Formulation and utilisation of spent anaerobic digestate fluids for the growth and product formation of single cell algal cultures in heterotrophic and autotrophic conditions

Silkina

Zacharof

Hery

et al. 2017

Bioresource Technology

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Spent anaerobically digested effluents of agricultural origin were collected and treated using membrane filtration to achieve three-large particle free-nutrient streams of N:P ratios of 16.53, 3.78 and 14.22. Three algal species were grown on these streams, achieving good levels of bioremediation of digester fluids simultaneously with biomass and associated end product formation. Nannochloropsis oceanica and Scenedesmus quadricuada, where proven highly effective in remediating the streams achieving ammonia and phosphate reduction over 60% while for Schizochytrium limacinum SR21 these serve as an ideal production medium for lipids and biomass reaching 16.70w/w% and 1.42gL correspondingly. These processes thus provide treatment of sludge, avoiding the disposal problems by land spreading. The solid components are nutrient depleted but rich in organic matter as a soil enhancer, while the fluids rich in nutrients can be efficiently utilised for growth to generate high value materials of microalgae facilitating water reclamation.

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“…This alga has emerged as a model organism due to its ability to produce triacylglycerols and ω3-fatty acids [16, 17], as well as pigments and antioxidants [18]. …”

Section: Introductionmentioning

confidence: 99%

The plastoquinone pool of Nannochloropsis oceanica is not completely reduced during bright light pulses

2017

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The lipid-producing model alga Nannochloropsis oceanica has a distinct photosynthetic machinery. This organism possesses chlorophyll a as its only chlorophyll species, and has a high ratio of PSI to PSII. This high ratio of PSI to PSII may affect the redox state of the plastoquinone pool during exposure to light, and consequently may play a role in activating photoprotection mechanisms. We utilized pulse-amplitude modulated fluorometry to investigate the redox state of the plastoquinone pool during and after bright light pulses. Our data indicate that even very intense (5910 μmol photons s-1m-2 of blue light having a wavelength of 440 nm) light pulses of 0.8 second duration are not sufficient to completely reduce the plastoquinone pool in Nannochloropsis. In order to achieve extensive reduction of the plastoquinone pool by bright light pulses, anaerobic conditions or an inhibitor of the photosynthetic electron transport chain has to be utilized. The implication of this finding for the application of the widely used saturating pulse method in algae is discussed.

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Integrated process of two stage cultivation of Nannochloropsis sp. for nutraceutically valuable eicosapentaenoic acid along with biodiesel

Cited by 60 publications

References 32 publications

Impact of Light Intensity on Antioxidant Activity of Tropical Microalgae

Impact of Light Intensity on Antioxidant Activity of Tropical Microalgae

Formulation and utilisation of spent anaerobic digestate fluids for the growth and product formation of single cell algal cultures in heterotrophic and autotrophic conditions

The plastoquinone pool of Nannochloropsis oceanica is not completely reduced during bright light pulses

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