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International Journal of Medicinal Mushrooms
Fator do impacto: 1.423 FI de cinco anos: 1.525 SJR: 0.431 SNIP: 0.716 CiteScore™: 2.6

ISSN Imprimir: 1521-9437
ISSN On-line: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.v7.i3.51
340 pages

Selenium Enrichment of Grifola frondosa (Dicks.:Fr.) S.F.Gray (Maitake) Mushrooms

Robert B. Beelman
Department of Food Science, 116D Borland Laboratory, College of Agricultural Sciences, The Pennsylvania State University, University Park, Pennsylvania, 16802-4507, USA
Daniel J. Royse
Borland Laboratory, Departments of Food Science and Plant Pathology, College of Agricultural Sciences, The Pennsylvania State University, University Park, PA 16802-4507, USA

RESUMO

Grifola frondosa (Dicks.:Fr.) S.F.Gray (Maitake) is a popular culinary mushroom that is well known to contain unique β-glucans, which have potent immune-modulating and antitumor properties. However, they generally contain low levels of important micronutrient minerals, such as selenium. Selenium has recently generated great interest in nutritional and medical research, because it serves as a cofactor for the enzyme glutathione peroxidase, which is involved in quenching free radicals. Thus, the objective of this study was to determine if G. frondosa can be enriched with selenium by addition of sodium selenite to the growth substance, as was done previously with Agaricus bisporus (J. Lge) Imbach. Two separate crops were grown using a sawdust-based synthetic medium with various levels of selenium added by addition of appropriate amounts of sodium selenite prior to pasteurization and inoculation. Basidiomes were harvested from the treated substrates, weighed for yield determination, freeze-dried for solids determination, and than analyzed for selenium content using graphite-furnace atomic absorption spectrophotometry. Yield was not significantly affected by addition of selenium to the substrate, but basidiomes were harvested 5—7 days earlier when selenium was added. No selenium (<0.5 μg/g) was detected in the untreated (control) substrate and the basidiomes harvested from it. Selenium increased in the basidiomes in direct response to levels added to the substrate. Treated substrates contained 0.6, 2.4, and 7.2 μg/g (d.w.) selenium and basidiomes harvested from them contained 0.6, 2.2, and 9.3 μg/g (d.w.), respectively. These results indicate that G. frondosa can be predictably enriched with selenium in a manner similar to Agaricus bisporus to become an excellent nutritional source of selenium. Also, production of Maitake extracts or powders for nutraceutical or medicinal purpose that can contain significant levels of selenium in addition to β-glucans would be possible.


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