Optimization of heat pump-hot air combined drying on sweet potato leaf powder

  • ZHANG Yingmin ,
  • REN Guangyue ,
  • DUAN Xu ,
  • LIU Panpan
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  • 1(College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000,China)
    2(Collaborative Innovation Center of Grain Storage Security, Zhengzhou 450000,China)

Received date: 2020-06-07

  Revised date: 2020-07-16

  Online published: 2021-02-03

Abstract

To determine ensure the quality of sweet potato leaf powder and reduce processing energy consumption, this study used heat pump-hot air combined drying technology to treat sweet potato leaves, based on a single factor test, the Box-Behnken Design (BBD) method was used to design and optimize the test to study the heat pump drying temperature, The influence of hot air drying temperature and moisture content of conversion point on unit energy consumption, chlorophyll content, color L* value and hygroscopicity, a polynomial regression model is derived by weighted comprehensive scoring method, and the parameters of combined drying process are optimized.The optimized parameters of the response surface are:heat pump drying temperature 52 ℃, hot air drying temperature 73 ℃, conversion point moisture content 58%, unit energy consumption under this process is 3 621.36 kJ/g, chlorophyll content 6.42 mg/g, color L value 46.21, moisture absorption 7.19%, and the comprehensive score value and the predicted value are as high as 99.63%, which lays a theoretical foundation for the comprehensive utilization of sweet potato leaves.

Cite this article

ZHANG Yingmin , REN Guangyue , DUAN Xu , LIU Panpan . Optimization of heat pump-hot air combined drying on sweet potato leaf powder[J]. Food and Fermentation Industries, 2021 , 47(1) : 198 -205 . DOI: 10.13995/j.cnki.11-1802/ts.024666

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