Development of Green and Advanced Food Freezing/Anti-Freezing Technologies

A special issue of Foods (ISSN 2304-8158). This special issue belongs to the section "Food Engineering and Technology".

Deadline for manuscript submissions: 28 May 2025 | Viewed by 2132

Special Issue Editors

1. School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
2. Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
Interests: green cryopreservation; passive anti-freezing soft materials; advanced freezing technology (ultrasound-assisted freezing)

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Guest Editor Assistant
1. School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
2. Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
Interests: green cryopreservation; advanced freezing; thawing technology

Special Issue Information

Dear Colleagues,

The frozen food industry has undergone development for nearly 150 years, during which numerous perceived problems with frozen products have been overcome as the freezing technology advanced. However, freezing can be a two-edged sword when employed practically in the food industry. In recent decades, thanks to the extensive introduction of physical fields, a series of advanced freezing technologies such as ultrasound-assisted freezing, high-pressure-assisted freezing, and high-voltage electric field-assisted freezing have increasingly garnered attention regarding the endowment of frozen foods with better post-thaw quality. Although reliable freezing can “pause” biological activities and ensure a longer shelf-life, the damage caused by freezing in more hidden microworlds is inevitable, causing the severe loss of texture in frozen products and the irreversible cryoinjury of cryopreserved strains. In this regard, green and efficient anti-freezing technologies are urgently needed. Given the aforementioned facts, both freezing and anti-freezing technologies are equally crucial in the iterative upgrade of the frozen food industry. Hence, this Special Issue aims to provide an overview of research on green and advanced freezing/anti-freezing technologies, and it is hoped that our joint efforts can create a brighter future for the frozen food industry.

Dr. You Tian
Guest Editor

Dr. Rui Hu
Guest Editor Assistant 

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Keywords

  • freezing technologies
  • physical fields
  • supercooling
  • ice nucleation
  • ice recrystallization
  • thawing
  • post-thaw quality
  • anti-freezing
  • cryopreservation
  • cryoprotectants

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Published Papers (2 papers)

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Research

15 pages, 4178 KiB  
Article
Novel Strategies for Yuba Quality Improvement: Protein Modification Based on Physical Fields
by Wenchao Liu, You Tian, Lijuan Wang, Rui Hu, Yan Zhang, Linlin Li, Weiwei Cao, Xu Duan and Guangyue Ren
Foods 2025, 14(6), 1033; https://doi.org/10.3390/foods14061033 - 18 Mar 2025
Viewed by 275
Abstract
This study investigated the effects of physical field protein modification methods on the mechanical properties, color, rehydration performance, thermal stability, and sensory quality of yuba. The results showed that all three modification methods shortened the drying time of yuba, and each method enhanced [...] Read more.
This study investigated the effects of physical field protein modification methods on the mechanical properties, color, rehydration performance, thermal stability, and sensory quality of yuba. The results showed that all three modification methods shortened the drying time of yuba, and each method enhanced the tensile strength and thermal stability of yuba. Yuba treated with microwave–vacuum for 10 min demonstrated the best performance in terms of tensile strength, elongation, color, and overall sensory score, making it the optimal method for the physical field modification of yuba. In addition, microwave–vacuum treatment led to better rehydration performance, thermal stability, and a faster rehydration rate. Through the analysis of the microstructure of yuba as well as its protein secondary and tertiary structures, it was found that microwave–vacuum treatment can maintain the tissue network structure of yuba while promoting more heat-induced protein conformational changes, showing a greater increase in the content of β-sheets, which contribute to enhancing the tensile strength and water-holding capacity of yuba, thereby improving its product quality. Full article
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11 pages, 1967 KiB  
Article
The Evolution of Mechanical Properties and Cellular Structure of Apples During Freeze Drying Combined with Hot Air Drying (FD-HAD) Process
by Lili Li, Mengmeng Yang, Lewen Zhu, Wenchao Liu, Linlin Li, Weiwei Cao, Junliang Chen, Linlin Zhao, Chung Lim Law, Tongxiang Yang, Guangyue Ren and Xu Duan
Foods 2024, 13(23), 3951; https://doi.org/10.3390/foods13233951 - 7 Dec 2024
Viewed by 1212
Abstract
Apples are one of the most popular fruits in the world and have a significant share in domestic and international fruit production. Drying is a common method used to extend the shelf life of apples. However, it also induces irregular morphological changes in [...] Read more.
Apples are one of the most popular fruits in the world and have a significant share in domestic and international fruit production. Drying is a common method used to extend the shelf life of apples. However, it also induces irregular morphological changes in apples, which are essential to maintaining the structural integrity of the material. Therefore, it is necessary to understand the effect of cellular changes at the microscopic level on the macroscopic deformation of the material during drying. In this paper, the evolution of cell wall pectin fractions and viscoelastic properties of apples during freeze drying combined with hot air drying was investigated. The findings indicated that during the HAD stage, a decrease in the relaxation modulus (E1) of the samples was observed in the compression tests when the sample temperature was significantly higher than the glass transition temperature (Tg). As the difference between the two decreased, the samples exhibited increased stiffness and higher E1. The results of the pectin content analysis showed that the HAD process accelerated the loss and degradation of water-soluble pectin in the samples with high moisture content at the transition point. Simultaneously, the esterification degree of chelator-soluble pectin increased, leading to a reduction in the support provided to the cellular structure of the samples, which consequently affected their mechanical properties. These findings may provide valuable information for the application of freeze drying combined with hot air drying in the efficient processing of dried fruit and vegetable products. Full article
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