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Selenocysteine from yeast

Selenocysteine is the 21st proteinogenic amino acid and therefore an interesting supplement for food and health products. Yeasts that grow at high selenium concentrations are considered to integrate much of ionic selenium into organic selenium and thus could be a reliable source for selenocysteine. That is why CCOS checked some of its Saccharomyces cerevisiae strains for the grow on agar plates with high concentrations of selenium.

CCOS No.  Growth on 500 ppm Selenium Growth on 1500 ppm Selenium
227 good no
298 weak no
375 good good
376 good good
377 good good
378 good good
379 good weak
380 good weak
381 good good (reddish colonies)
382 good good
383 good good
384 good good
392 good good
538 good good
581 good weak
582 good weak
583 good good (reddish colonies)
584 good no
585 good good
777 good good
779 good good (reddish colonies)
792 good weak
809 good weak
834 good good
835 good no
912 good no