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Selenium incorporation to amino acids in cultures grown in phototrophic and heterotrophic regime.

07:00 EST 14th January 2020 | BioPortfolio

Summary of "Selenium incorporation to amino acids in cultures grown in phototrophic and heterotrophic regime."

Microalgae accumulate bioavailable selenium containing amino acids (Se-AAs) and these are useful as a food supplement. While this accumulation has been studied in phototrophic algal cultures, little data exists for heterotrophic cultures. We have determined Se-AAs content, selenium/sulphur (Se/S) substitution rates and overall Se accumulation balance in photo- and heterotrophic Chlorella cultures. Laboratory trials revealed that heterotrophic cultures tolerate Se doses ~8-fold higher compared to phototrophic cultures, resulting in a ~2-3-fold higher Se-AAs content. In large-scale experiments both cultivation regimes provided comparable Se-AAs content. Outdoor phototrophic cultures accumulated up to 400 μg g-1 of total Se-AAs and exhibited a high level of Se/S substitution (5-10%) with 30-60% organic/total Se embedded in the biomass. A slightly higher content of Se-AAs and ratio of Se/S substitution was obtained for a heterotrophic culture in pilot-scale fermentors. The data presented here shows that heterotrophic Chlorella cultures provide an alternative for Se-enriched biomass production and provides information on Se-AAs content and speciation in different cultivation regimes.

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This article was published in the following journal.

Name: Journal of agricultural and food chemistry
ISSN: 1520-5118
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Medical and Biotech [MESH] Definitions

A myodegeneration most frequent in calves and lambs whose dams have been fed during gestation or longer on feeds, especially legumes (FABACEAE), grown in certain areas where selenium is either deficient or unavailable in the soil. It has been recorded in many countries. It has been produced experimentally in several species of animals on low-selenium intake. A similar myopathy occurs naturally in goats, deer, foals, and dogs but proof of the etiology is lacking. (Merck Veterinary Manual, 5th ed)

A selenium compound used as a source of SELENIUM, especially for patients that develop selenium deficiency following prolonged PARENTERAL NUTRITION.

Unstable isotopes of selenium that decay or disintegrate emitting radiation. Se atoms with atomic weights 70-73, 75, 79, 81, and 83-85 are radioactive selenium isotopes.

A group of proteins that covalently attach to selenium or SELENIUM-containing compounds.

Amino acids and chains of amino acids connected by peptide linkages.

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