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Speciation of seleno-metabolites and selenoproteins in Se-enriched Chlorella sorokiniana microalgae, in vitro and in vivo extracts has been performed by HPLC-ICP-MS. Selenium bioaccesibility in Se-enriched Chlorela sorokiniana evaluated by in vitro gastrointestinal digestion of the selenized microalga was 81% (79% as SeMet). Mice supplemeted with Se-enriched C. sorokiniana presented increased Se concentration in kidney, reflecting a potencial mechanism of excretion by urine. In addition, selenium bioavailavility, which was in the range of 3–15% depending on the diet was 1.13-fold higher in mice fed with Se-enriched microalgae against the basal diet, but decreased with higher amounts of selenium. Regarding bioactivity (∑Se as selenoproteins in serum/total Se in serum = 76–85% depending on the diet), selenium and selenoproteins (SeP) increased in serum from animals fed high supplemental Se levels. These results showed that Se-enriched algae can be considered as an alternative selenized food for humans, due to their high Se bioavailability.

journal of functional foods

In vitro selenium bioaccessibility combined with in vivo bioavailability and bioactivity in Se-enriched microalga (Chlorella sorokiniana) to be used as functional food