Food Science and Biotechnology

  • 제16권1호
  • /
  • Pages.154-158
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  • 2007
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  • 1226-7708(pISSN)
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  • 2092-6456(eISSN)
한국식품과학회 (Korean Society of Food Science and Technology)
권호 표지

Moisture Sorption Isotherm Characteristics of Chaga Mushroom Powder as Influenced by Particle Size

  • Lee, Min-Ji (Department of Food Science and Engineering, Daegu University) ;
  • Lee, Jun-Ho (Department of Food Science and Engineering, Daegu University)
  • 발행 : 2007.02.28
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초록

Adsorption isotherms for chaga mushroom powder as influenced by particle size were investigated using a gravimetric technique. Samples were equilibrated in desiccators containing sulfuric acid solutions of known water activity (0.11-0.93), then placed in temperature-controlled chambers for approximately ten days. Equilibrium moisture content (EMC) of chaga mushroom powder increased with water activity in all samples. EMC was slightly greater in the samples comprised of smaller particle size, however there was no marked difference in appearance between the three samples. The chaga mushroom powder exhibited Type II behavior. When the BET model was used to determine mean monolayer values, 0.077, 0.077, and 0.070 $H_2O/dry$ solid was observed for <250, 250-425, and $425-850\;{\mu}m$ sized samples, respectively, however mean monolayer values were 0.121, 0.111, and 0.101 $H_2O/dry$ solid, respectively, when the GAB model was used. The experimental EMC values were related to the computed values from Henderson's model. The coefficient of determination and standard error for the linear regression were 0.997 and 0.003, respectively.

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