Study of heat pump combined with far-infrared final-stage drying of Zizania latifolia and its rehydration characteristics

doi:10.3969/j.issn.1004-1524.20240339

Acta Agriculturae Zhejiangensis ›› 2025, Vol. 37 ›› Issue (4): 909-919.DOI: 10.3969/j.issn.1004-1524.20240339

• Food Science • Previous Articles Next Articles

Study of heat pump combined with far-infrared final-stage drying of Zizania latifolia and its rehydration characteristics

WU Kunlin¹^,²(), LIU Ruiling², FANG Xiangjun², WANG Guannan², NIU Ben², CHEN Huizhi², CHEN Hangjun², WU Weijie², GAO Haiyan²^,^*()

1. College of Life Science, Zhejiang Normal University, Jinhua 321004, Zhejiang, China
2. Key Laboratory of Post-Harvest Fruit Processing, Ministry of Agriculture and Rural Affairs, Key Laboratory of Postharvest Preservation and Processing of Vegetables (Co-Construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Zhejiang Key Laboratory of Intelligent Food Logistics and Processing, Key Laboratory of Postharvest Preservation and Processing of Fruits and Vegetables, China National Light Industry, Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China

Received:2024-04-12 Online:2025-04-25 Published:2025-05-09

Abstract

Abstract:

In order to study the heat pump combined with far-infrared final-stage drying process of Zizania latifolia and its effect on the moisture migration characteristics after rehydration, this study investigated the drying characteristics of Z. latifolia under different heat pump temperatures and heat pump combined with far-infrared final-stage drying. Low-field nuclear magnetic resonance technology (LF-NMR) was used to analyze the relaxation characteristics of moisture in dried Z. latifolia, and the determination of rehydration rate and imaging technology were used to further study the rehydration capacity after drying. The results showed that under different temperatures of the heat pump, the dry-based water content of Z. latifolia decreased rapidly with extending the drying time. With the increase in treatment temperature, the maximum point of drying rate was increased, and the rehydration performance of Z. latifolia at 60 ℃ was better than that of other temperatures. After pre-drying with heat pump at 60 ℃ for 30 min, then combining with different far-infrared radiation intensities (0, 400, 800 W) for the final-stage drying treatment, the mobility of free water decreased with the prolongation of drying time. At the end of the drying process, the relaxation peak corresponding to T₂₃ in the 60 ℃, 60 ℃+400 W and 60 ℃+800 W treatment groups disappeared, indicating that the free water was completely removed. The main moisture state of rehydrated Z. latifolia was immobilized water, which was concentrated in the outer part of Z. latifolia. The rehydration moisture signal of dried Z. latifolia made by 60 ℃ heat pump combined with 400 W far-infrared final-stage drying was significantly stronger than that of the other treatment groups, with greater rehydration capacity and shorter drying time than that of the single heat pump treatment at 60 ℃. Overall, heat pump combined with far-infrared final-stage drying can significantly improve the rehydration efficiency of dried Z. latifolia, and the LF-NMR technology can accurately analyze the dynamic migration law of moisture in the drying process, providing non-destructive testing method support for the optimization of the combined drying process of fruits and vegetables.

Key words: Zizania latifolia, heat pump combined with far-infrared drying, low-field nuclear magnetic resonance, moisture distribution, rehydration

CLC Number:

TS254.58

WU Kunlin, LIU Ruiling, FANG Xiangjun, WANG Guannan, NIU Ben, CHEN Huizhi, CHEN Hangjun, WU Weijie, GAO Haiyan. Study of heat pump combined with far-infrared final-stage drying of Zizania latifolia and its rehydration characteristics[J]. Acta Agriculturae Zhejiangensis, 2025, 37(4): 909-919.

Figures/Tables 8

Fig.1 Dry-based water content curve (A) and drying rate curve (B) of Zizania latifolia at different heat pump temperatures

Fig.2 Rehydration rate (A) and T2 inversion spectrum (B) of Zizania latifolia dried products made at different heat pump temperatures Bars marked without the same lowercase letters in the figure indicate significant differences (P<0.05) between treatments. The same as below.

Fig.3 Rehydration MRI of Zizania latifolia dried products made at different heat pump temperatures Red represents high water content, and blue represents low water content. The same as below.

Fig.4 Specific moisture extraction rate (SMER) of Zizania latifolia under 60 ℃ heat pump drying process

Fig.5 Dry-based water content (A) and drying rate (B) of Zizania latifolia under heat pump combined with far-infrared final-stage drying

Fig.6 The change of T2inversion spectrum with drying time under heat pump combined with far-infrared final-stage drying A,60 ℃;B,60 ℃+400 W;C, 60 ℃+800 W。

Fig.7 Rehydration rate (A) and T2 inversion spectrum (B) of Zizania latifolia dried products made by heat pump combined with far-infrared final-stage drying

Fig.8 Rehydration MRI of Zizania latifolia dried products made by heat pump combined with far-infrared final-stage drying

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Study of heat pump combined with far-infrared final-stage drying of Zizania latifolia and its rehydration characteristics

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