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KMID : 1025520050470020305
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Journal of Animal Science and Technology
2005 Volume.47 No. 2 p.305 ~ p.316
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Studies on the Selenium Type and Metabolism of Selenium Accumulation in the Selenium-Enriched Mushroom, Flammulina Velutipes, and Its Spent Mushroom Composts
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Lee Seong-Hun
Kwak Wan-Sup
Kim Wan-Young
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Abstract
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This study was conducted to determine the total amount and type of selenium (Se) in the Se-enriched mushroom and its spent mushroom composts (SMC), and to investigate the metabolism in relation to Se accumulation in the mushroom. Mushrooms, Flammulina velutipes, used in this study were grown for 60days by adding 2mg of inorganic Se (Na2SeO3) per kg of mushroom composts (MC) on as-fed basis and were compared with normal mushrooms grown on the non Se-supplemented MC.
Total Se contents for Se-treated mushrooms were significantly increased (P<0.0001) by 20-fold (4.51μg/g of dry) compared to Se-untreated (0.23μg/g of dry). On the contrary, organic Se ratio was significantly lower (P<0.0001) in the Se-treated mushroom (72.3%) than the Se-untreated one (100%, not analytically detected of inorganic Se). Se distribution upon a length in the Se-treated mushrooms was the highest in the bottom part (6.86μg/g of dry) near to MC, and top and middle parts were significantly lower (3.71 and 3.01μg/g of dry, respectively; P<0.001) than the bottom. In the SMC from Se-treated mushrooms, the significant amount of Se (5.04μg/g of dry) was remained, but that from the Se-untreated mushrooms was significantly low (P<0.0001) as 0.08μg/g of dry. Se-treated SMC showed a high ratio of organic Se (65.67%), suggesting that the significant amount of inorganic Se in the SMC was converted to organic Se by mushroom mycelia. Prior to mycelia inoculation in the mushroom culture, the sterilization of MC brought approximately 18% of Se loss in the MC. Apparent and net accumulation rates (%) for Se into mushrooms were 14.81 and 10.14%, respectively, resulting from the Se volatilization into the air via metabolic process of mushroom itself.
The result of this study shows that inorganic Se addition to MC for mushroom improved the organic Se contents in the mushroom and SMC. This study showed the possibility that Se in Se-enriched mushroom and SMC could be utilized as Se sources of food for human as well as feed for livestock.
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KEYWORD
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Selenium, Mushrooms, Spent mushroom composts, Selenium type, Metabolism
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