Food and Fermentation Industries >

2023 , Vol. 49 >Issue 5: 230 - 236

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.030888

Effect of ultrasonic+alkaline ethyl oleate pretreatment on heat pump drying characteristics of Lycium barbarum

  • WANG Zhaokai ,
  • REN Guangyue ,
  • DUAN Xu ,
  • LI Linlin ,
  • ZHU Kaiyang ,
  • CHU Qianqian
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  • 1(College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China)
    2(Henan Collaborative Innovation Center for Grain Storage Security, Zhengzhou 450001, China)

Received date: 2022-01-25

  Revised date: 2022-03-23

  Online published: 2023-04-06

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Abstract

To investigate the effects of ultrasonic (US) and ethyl oleate (AEEO) pretreatments on drying and physicochemical properties of Lycium barbarum, Lycium barbarum was dried by heat pump with the US, AEEO (1, 3, and 5 min), and US+AEEO (1, 3, and 5 min) pretreatment, then the drying efficiency, nutrient content, antioxidant capacity, microstructure, rehydration capacity, and energy consumption of Lycium barbarum were determined and analyzed respectively. Results showed that US+AEEO pretreatment could increase the effective water diffusion coefficient significantly (P<0.05), with the drying time, shorten by 47.37%-57.89%, and the rehydration rate increased by 5.86%-13.51%. Fourier transform infrared spectroscopy (FTIR) analysis showed that all pretreatment methods did not change the chemical composition of Lycium barbarum, but with the increase of AEEO treatment time, the contents of total phenols and flavonoids and antioxidant capacity of dried samples increased first and then decreased. Compared with the control group, the heat pump drying energy consumption after US+AEEO pretreatment was reduced by 45.67%-57.21%. The results of scanning electron microscopy (SEM) showed that the waxy epidermal layer of Lycium barbarum dissolved and ruptured with the increase of AEEO treatment time, and the changes of ultrastructure promoted water migration and chemical release in the samples. Therefore, the US+AEEO pretreatment mode can effectively improve drying efficiency and drying quality.

Key words： Lycium barbarum; ultrasound; ethyl oleate; wax layer; heat pump drying; cell permeability

Cite this article

WANG Zhaokai , REN Guangyue , DUAN Xu , LI Linlin , ZHU Kaiyang , CHU Qianqian . Effect of ultrasonic+alkaline ethyl oleate pretreatment on heat pump drying characteristics of Lycium barbarum[J]. Food and Fermentation Industries, 2023 , 49(5) : 230 -236 . DOI: 10.13995/j.cnki.11-1802/ts.030888

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