FOOD SCIENCE ›› 2017, Vol. 38 ›› Issue (23): 8-13.doi: 10.7506/spkx1002-6630-201723002

• Basic Research • Previous Articles     Next Articles

Effect of Ultrasound-Assisted Osmotic Pretreatment on Freeze-Drying Efficiency and Quality of Agaricus bisporus

CHEN Lifu, PEI Fei, ZHANG Liming, ZHANG Rongjie, LI Jing, FANG Yong, HU Qiuhui*   

  1. Key Laboratory of Grains and Oils Quality Control and Processing, Collaborative Innovation Center for Modern Grain Circulation and Safety, College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China
  • Online:2017-12-15 Published:2017-12-07

Abstract: In order to produce high-quality freeze-dried products and simultaneously reduce energy consumption for cost saving during the freeze drying process, the effect of osmotic dehydration (OD) and ultrasound-assisted osmotic dehydration (UOD) pretreatment on the eutectic point, melting point and temperature of Agaricus bisporus during freezing and freeze-drying and the texture, microstructure, color and nutritional quality of freeze-dried product were investigated. The results showed that 45 min UOD treatment, compared to the fresh treatment, reduced freezing time by 21.24% and freezedrying time by 28.62%. Moreover, this treatment retained more titratable acids, proteins and polyphenols than did 120 min OD treatment. Meanwhile, the hardness and rehydration ratio of 45 min UOD treatment were higher than those of 120 min OD treatment, and its microstructure was more similar to that of fresh samples.

Key words: Agaricus bisporus, ultrasound-assisted osmotic pretreatment, freeze-drying, nutrition quality, microstructure

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