Effects of nitrogen and phosphorous stress on the formation of high value LC-PUFAs in Porphyridium cruentum

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Detail(s)

Original languageEnglish
Pages (from-to)5763-5773
Journal / PublicationApplied Microbiology and Biotechnology
Volume102
Issue number13
Online published18 Apr 2018
Publication statusPublished - Jul 2018

Abstract

This study systematically examined the effect of nitrogen and phosphorous stress on the formation of linoleic acid (LA), arachidonic acid (ARA), and eicosapentaenoic acid (EPA) in Porphyridium cruentum gy-h56. P. cruentum was cultivated in six different media conferring different conditions of nitrogen (N) sufficiency/deprivation and phosphorous (P) sufficiency/limitation/deprivation. Over a 16-day cultivation process, the dry-weight content, proportion of total fatty acids (TFAs), and the concentration in the medium of linoleic acid (LA) were greatly improved by a maximum of 2.5-, 1.6-, and 1.1-fold, respectively, under conditions of N or P deprivation compared with N and P sufficiency. In contrast, levels of EPA or ARA were not enhanced under N or P stress conditions. Additionally, the results showed that N deprivation weakened the impact of P deficiency on the content and proportions of LA and EPA, while P deprivation enhanced the impact of N starvation on the content and proportions of LA and EPA. The conditions of N sufficiency and P deprivation (N+P-) were the optimal conditions for the production of LA, while the optimal conditions for EPA, ARA, and TFAs production were N sufficiency and P limitation (N+P-lim). This study suggests the potential application of combining N removal from saline wastewater with the production of LA, ARA, EPA, and biodiesel.

Research Area(s)

  • Nitrogen or phosphorous stress, Eicosapentaenoic acid (EPA), Linoleic acid (LA), Arachidonic acid (ARA), Total fatty acids (TFAs), Porphyridium cruentum, FATTY-ACIDS, EICOSAPENTAENOIC ACID, PHAEODACTYLUM-TRICORNUTUM, BIODIESEL PRODUCTION, ARACHIDONIC ACIDS, LINOLEIC-ACID, MICROALGAE, PURPUREUM, GROWTH, LIGHT