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effect of nitrogen and phosphorus starvation on the polyunsaturated triacylglycerol composition including positional isomer distribution in the alga trachydiscus minutus

descriptionPublicationkeyboard_double_arrow_right Article 01 Dec 2011Publisher:Elsevier BVJournal:Phytochemistry, volume 72, pages 2,342-2,351 (issn: 0031-9422,

Authors: Jaromír Lukavský; Karel Sigler; Tomas Rezanka; Linda Nedbalová; Linda Nedbalová;

doi: 10.1016/j.phytochem.2011.08.017

pmid: 21911235

effect of nitrogen and phosphorus starvation on the polyunsaturated triacylglycerol composition including positional isomer distribution in the alga trachydiscus minutus

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Abstract

The yellow-green alga Trachydiscus minutus (Eustigmatophyceae, Heterocontophyta) was cultivated in a standard medium and under nitrogen- and phosphorus-starvation and its triacylglycerols were analyzed by RP-HPLC/MS-APCI. The molecular species of triacylglycerols included a total of 74 triacylglycerols having at least one polyunsaturated fatty acid. Polyunsaturated triacylglycerols were identified for the first time in a yellow-green alga. N-starvation brought about a nearly 50% drop in TAGs containing EPA, and also decreased TAGs containing ARA, while P-starvation had a sizable effect on those TAGs that contain two or three arachidonic acids. In four TAGs containing PUFA, i.e. EEE, EEA, EAA and AAA, N-starvation caused a rapid fivefold increase in ARA content and the ratio of TAGs containing ARA, i.e. AEE to AAA increased tenfold relative to control. Regioisomeric characterization of triacylglycerols containing palmitic, arachidonic (ARA) and eicosapentaenoic acids (EPA) showed that the proportion of positional isomers is affected by N- and P-starvation. N- and P-starvation also changed the ratio of symmetrical to asymmetrical TAGs. Positional isomers exhibited identical ratios of symmetrical and asymmetrical TAGs irrespective of the type of FAs. In control cultivation the major TAGs with a single PUFA were symmetrical ones (PEP or PAP) whose ratio to asymmetrical counterparts (PPE or PPA) was about 3:1, whereas N- and P-starvation yielded opposite ratios, 1:3-1:5. The control cultivation yielded ~90% asymmetrical TAGs with two PUFAs (i.e. PEE and PAA), whereas with N- and P-starvation the ratio of symmetrical to asymmetrical TAGs increased to 2:1 and 3:2, respectively.

Related Organizations

Charles University
Czech Republic
Czech Academy of Sciences
Czech Republic

Keywords

Nitrogen, Phosphorus, Chromatography, High Pressure Liquid, Mass Spectrometry, Stramenopiles, Triglycerides

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RESPONSE OF TRACHYDISCUS MINUTUS (XANTHOPHYCEAE) TO TEMPERATURE AND LIGHT¹
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Stanovení optimálních podmínek pro růst buněk a akumulaci zásobních lipidů řasy Trachydiscus minutus
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Trachydiscus guangdongensis sp. nov., a new member of Eustigmatophyceae (Stramenopiles) isolated from China: morphology, phylogeny, fatty acid profile, pigment, and cell wall composition
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Red-shifted light-harvesting system of freshwater eukaryotic alga Trachydiscus minutus (Eustigmatophyta, Stramenopila)
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Trachydiscus minutus, a new biotechnological source of eicosapentaenoic acid
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effect of nitrogen and phosphorus starvation on the polyunsaturated triacylglycerol composition including positional isomer distribution in the alga trachydiscus minutus

effect of nitrogen and phosphorus starvation on the polyunsaturated triacylglycerol composition including positional isomer distribution in the alga trachydiscus minutus

6 Research products, page 1 of 1

Způsob kultivace kmenů mikrořas

RESPONSE OF TRACHYDISCUS MINUTUS (XANTHOPHYCEAE) TO TEMPERATURE AND LIGHT1

Stanovení optimálních podmínek pro růst buněk a akumulaci zásobních lipidů řasy Trachydiscus minutus

Trachydiscus guangdongensis sp. nov., a new member of Eustigmatophyceae (Stramenopiles) isolated from China: morphology, phylogeny, fatty acid profile, pigment, and cell wall composition

Red-shifted light-harvesting system of freshwater eukaryotic alga Trachydiscus minutus (Eustigmatophyta, Stramenopila)

Trachydiscus minutus, a new biotechnological source of eicosapentaenoic acid

RESPONSE OF TRACHYDISCUS MINUTUS (XANTHOPHYCEAE) TO TEMPERATURE AND LIGHT¹