Journal
JOURNAL OF FUNCTIONAL FOODS
Volume 96, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jff.2022.105215
Keywords
Nannochloropsis oceanica; Selenium; Selenite; Aquaculture; Se speciation; Chemical similarity
Categories
Funding
- Green Aquaculture Intensification in Europe (GAIN) from the European Union's Horizon [773330]
- Spanish Ministry of Science and innovation (MCIN) [PG2018-096608-B-C21]
- Generacion del Conocimiento. MCIN/AEI
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This study investigated the effect of sulphur on selenite accumulation in the microalga Nannochloropsis oceanica. The results showed that low concentrations of sulphur significantly increased selenium accumulation, while high concentrations of sulphur reduced selenium accumulation. Additionally, sulphur had no significant effect on total fatty acid content.
Sulphur (S) and selenium (Se) are chemically similar. Once Se is taken up, it substitutes S in S-containing amino acids. This study investigated the effect of S on selenite accumulation in the microalga Nannochloropsis oceanica. [0-28 mM] S concentrations and selenite concentrations of 0 and 30 mu M were tested. S concentrations of <= 3 mM led to decreased cell growth whereas cultures with >= 4 mM were not growth limited. Se accumulation increased up to 8-fold when using S <= 2 mM and decreased with S 28 mM. The average relative abundance of organic Se species was selenomethionine (SeMet) 98.2 %, selenocystine (SeCys(2)) 1.4 % and selenomethyl selenocysteine (SeMeSeCys) 0.4 %. Total fatty acids were not affected by S limitation or Se presence. This is the first study on the effect of S on selenite accumulation, organic Se speciation of N. oceanica and its potential as an organic Se-enriched food/feed ingredient.
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