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Impact of nutrient stress on antioxidant production in three species of microalgae

Tijdschriftbijdrage - Tijdschriftartikel

Microalgae are a novel source of sustainable natural antioxidants with various applications,including food preservation. To optimize antioxidant production in microalgae, we investigated theinfluence of nutrient limitation on antioxidant content in three species, Phaeodactylum tricornutum,Tetraselmis suecica and Chlorella vulgaris. Microalgae were cultivated in batch culture under nutrientreplete, P- and N-limited conditions. Total antioxidant activity of the biomass was measured usingTrolox equivalent antioxidant capacity and square wave voltammetry. Additionally, contents ofcarotenoids, phenolics, tocopherols and ascorbic acid were measured. Nutrient limitation, particularlyN-limitation, resulted in low antioxidant content. Both phenolic and carotenoid contents weresignificantly reduced in nutrient-limited cultures. In contrast tocopherols and ascorbic acid levels werehigher in nutrient-limited cultures, particularly under P-limitation. Our results indicate that nutrientstress is not an effective strategy to enhance overall antioxidant content in microalgae, although it maybe useful to enhance production of some vitamin antioxidants such as tocopherols or ascorbic acid.
Tijdschrift: Algal Research
ISSN: 2211-9264
Volume: 7
Pagina's: 51 - 57
Jaar van publicatie:2015