NDLI: Fatty acids profile and temperature in the cultured marine diatom Odontella aurita

Content Provider	Springer Nature Link
Author	Pasquet, Virginie Ulmann, Lionel Mimouni, Virginie Guihéneuf, Freddy Jacquette, Boris Morant Manceau, Annick Tremblin, Gérard
Copyright Year	2014
Abstract	The diatom Odontella aurita has now been industrially cultured and commercialized as a dietary supplement rich in omega-3 fatty acids for several years. In this study, we investigated the effect of three temperatures (8, 16, and 24 °C) on the growth and fatty acid composition of cells harvested during the exponential and stationary growth phases. These temperatures were selected on the basis of photosynthesis responses previously obtained at different temperatures using a modulated fluorometer. Our results confirm that both growth and lipid composition were sensitive to culture temperature. Growth was reduced when O. aurita was cultured at low temperature (8 °C) compared to when it was cultured at high temperatures (16 and 24 °C), but the proportion of polyunsaturated fatty acids (PUFAs, 20:5 n-3 and 22:6 n-3) increased while the level of saturated fatty acids (SFAs, 14:0 and 16:0) decreased in the cells harvested during both the exponential and stationary growth phases. On the other hand, the cells grown at 24 °C displayed a marked decrease in PUFA and an increase in SFA levels. Harvesting time is also a critical parameter in achieving optimum n-3 PUFA productivity during batch cultivation. Indeed, changes in fatty acid composition with growth phase seem to be dependent on the culture temperature, with the most marked effects being observed at 24 °C. PUFA levels (i.e., levels of 20:5 n-3 and 22:6 n-3) increased during the stationary growth phase, while the proportion of SFAs and monounsaturated fatty acids (MUFAs) fell with time. As this species is currently grown in outdoor ponds with seasonal temperature variations (minimal and maximal average temperatures in winter and summer, from 3 to 9 °C and from 13 to 26 °C, respectively), this factor can be expected to have a strong influence on the fatty acid content and composition of the algal biomass harvested and commercialized.
Starting Page	2265
Ending Page	2271
Page Count	7
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	26
Issue Number	6
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-02-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diatom Odontella aurita Temperature Lipids n-3 Fatty acids EPA DHA Plant Sciences Freshwater & Marine Ecology Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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