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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

셀레늄 강화 팽이버섯과 폐배지의 셀레늄 형태 및 팽이버섯내 셀레늄 축적대사에 관한 연구

  • Lee, S.H. (Department of Animal Science, Korea National Agricultural College, RDA) ;
  • Kwak, W.S. (Department of Animal Science, Konkuk University) ;
  • Kim, W.Y. (Department of Animal Science, Korea National Agricultural College, RDA)
  • 이성훈 (한국농업전문학교 축산학과) ;
  • 곽완섭 (건국대학교 축산학과) ;
  • 김완영 (한국농업전문학교 축산학과)
  • Published : 2005.04.30

Abstract

This study was conducted to determine the total amount and type of seleniwn (Se) in the Se-enriched mushroom and its spent mushroom composts (SMC), and to investigate the metabolism in relation to Se accwnulation in the mushroom. Mushrooms, Flammulina velutipes, used in this study were grown for 60 days by adding 2 rng of inorganic Se (Na2Se03) per kg of mushroom composts (MC) on as-fed basis and were compared with normal mushrooms grown on the non Se-supplemented Me. Total Se contents for Se-treated mushrooms were significantly increased (P < 0.0001) by 20-fold (4.51 $\mu$/ g of dry) compared to Se-untreated (0.23 $\mu$/ 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 (6.86 $\mu$/ g of dry) near to MC, and top and middle parts were significantly lower (3.71 and 3.01 $\mu$/ g of dry, respectively; P < 0.001) than the bottom. In the SMC from Se-treated mushrooms, the significant amount of Se (5.04l1g/g of dry) was remained, but that from the Se-untreated mushrooms was significantly low (P$\mu$ / 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.

Keywords

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