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Analysis of Moisture Change during Far-Infrared Drying of Agaricus bisporus

LIU Zongbo1, ZHANG Zhongyuan2, LI Dajing2,*, LI Dehai1, JIANG Ning2, LIU Chunquan2   

  1. 1. College of Forestry, Northeast Forestry University, Harbin 150040, China; 2. Engineering Research Centre of Agricultural
    Products Processing, East China (Jiangsu) Innovation Center of National Agricultural Science and Technology,
    Institute of Farm Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
  • Online:2016-05-15 Published:2016-05-18


The moisture distribution and change of Agaricus bisporus during far-infrared drying was analyzed by lowfield
nuclear magnetic resonance (NMR) technology. Agaricus bisporus slices (3, 5 and 7 mm thickness) were dried at
three different temperatures (50, 60 and 70 ℃). Results showed that the water states in Agaricus bisporus included free
water, immobilized water and bound water. Free water (M23) was the most dominant among the three water states, which
was 9 048.26, 12 038.71 and 17 532.27, respectively, for 3, 5 and 7 mm thick Agaricus bisporus slices. The removal of free
water and immobilized water from 3 mm thick Agaricus bisporus slices was the fastest at the same drying temperature.
The contents of free water and immobilized water in Agaricus bisporus slices were decreased gradually with increasing
temperature, independent of the thickness of slices, while the content of bound water had no obvious downtrend at different
temperatures. These findings indicated that free water and partial immobilized water were mainly removed during the drying
process, and bound water was hardly removed. Thus, the content of bound water had no significant effect on Agaricus
bisporus during far infrared drying.

Key words: nuclear magnetic resonance, drying, Agaricus bisporus, moisture change

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