Lc-pufa-enriched oil production by microalgae: accumulation of lipid and triacylglycerols containing n-3 lc-pufa is triggered by nitrogen limitation and inorganic carbon availability in the marine haptophyte pavlova lutheri
Guihéneuf, Freddy Stengel, Dagmar
Guihéneuf, Freddy
Stengel, Dagmar
Publication Date
2013-10-30
Keywords
microalgae, sodium bicarbonate, triacylglycerol, n-3 lc-pufa, pavlova lutheri, fatty-acid-composition, diatom phaeodactylum-tricornutum, alga parietochloris-incisa, light-intensity, chlamydomonas-reinhardtii, nannochloropsis sp, concentrating mechanisms, biochemical-composition, co2 concentration, arachidonic-acid
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Article
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Guihéneuf, Freddy; Stengel, Dagmar (2013). Lc-pufa-enriched oil production by microalgae: accumulation of lipid and triacylglycerols containing n-3 lc-pufa is triggered by nitrogen limitation and inorganic carbon availability in the marine haptophyte pavlova lutheri. Marine Drugs 11 (11), 4246-4266
Abstract
In most microalgal species, triacyglycerols (TAG) contain mostly saturated and monounsaturated fatty acids, rather than PUFA, while PUFA-enriched oil is the form most desirable for dietary intake. The ability of some species to produce LC-PUFA-enriched oil is currently of specific interest. In this work, we investigated the role of sodium bicarbonate availability on lipid accumulation and n-3 LC-PUFA partitioning into TAG during batch cultivation of Pavlova lutheri. Maximum growth and nitrate uptake exhibit an optimum concentration and threshold tolerance to bicarbonate addition (similar to 9 mM) above which both parameters decreased. Nonetheless, the transient highest cellular lipid and TAG contents were obtained at 18 mM bicarbonate, immediately after combined alkaline pH stress and nitrate depletion (day nine), while oil body and TAG accumulation were highly repressed with low carbon supply (2 mM). Despite decreases in the proportions of EPA and DHA, maximum volumetric and cellular EPA and DHA contents were obtained at this stage due to accumulation of TAG containing EPA/DHA. TAG accounted for 74% of the total fatty acid per cell, containing 55% and 67% of the overall cellular EPA and DHA contents, respectively. These results clearly demonstrate that inorganic carbon availability and elevated pH represent two limiting factors for lipid and TAG accumulation, as well as n-3 LC-PUFA partitioning into TAG, under nutrient-depleted P. lutheri cultures.
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MDPI AG
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Attribution-NonCommercial-NoDerivs 3.0 Ireland