Thermal and Non-thermal Technologies in Food Waste Processing

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

Deadline for manuscript submissions: 31 July 2024 | Viewed by 777

Special Issue Editor

School of Food Science and Technology, Jiangnan University, Wuxi, China
Interests: non-conventional technology; food waste; non-thermal effect; extraction; modification
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, food waste has received considerable attention as a social, economic, and environmental issue. Every year, billions of tonnes of food are wasted, with 54% of that wasted during production and 46% wasted during post-market operations. Food waste and byproducts possess great potential for producing valuable components. Most of them consist of cereal residues, fruit pomace, and peels, which are rich in bioactive compounds like carotenoids, polyphenols, vitamins, oils, etc. Depending on the nature and type of component/matrix, the processing of food waste involves one or more steps of pretreatment, separation, extraction, isolation, and purification to produce high-value products. Various technologies can be used to treat these byproducts, thereby contributing to sustainable development. These aspects contribute to the efficient use of available resources to drive the circular economy.

In this case, the Special Issue provides a distinctive overview of the latest developments in emerging technologies for the treatment of food waste, as well as an in-depth analysis of each process. Topics include separation, extraction, isolation, modification, and purification. Also, applied technologies include, but are not limited to, various thermal (ohmic heating, microwave heating, etc.) and non-thermal (magnetic field, electric field, ultrasonic, high-pressure, etc.) processing.

Dr. Na Yang
Guest Editor

Manuscript Submission Information

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Keywords

  • non-conventional technology
  • food waste
  • thermal effect
  • nonthermal effect
  • bioactive compound
  • extraction
  • modification

Published Papers (1 paper)

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Research

16 pages, 4334 KiB  
Article
Novel Electromagnetic Heat Hydrodistillation for Extraction of Essential Oil from Tangerine Peel
by Na Yang and Yamei Jin
Foods 2024, 13(5), 677; https://doi.org/10.3390/foods13050677 - 23 Feb 2024
Viewed by 662
Abstract
A novel electromagnetic heat method is presented for green extraction of natural compounds from peel residue. In the processing cavity obtained through 3D printing, a core made of amorphous alloy was applied to strengthen the magnetic flux. During the process, an induced electric [...] Read more.
A novel electromagnetic heat method is presented for green extraction of natural compounds from peel residue. In the processing cavity obtained through 3D printing, a core made of amorphous alloy was applied to strengthen the magnetic flux. During the process, an induced electric field was produced in the extract medium owing to an oscillating magnetic field at 50 kHz rather than a pair of electrodes; thus, electrochemical reactions could be avoided. A thermal effect and temperature rise were observed under the field, and essential oil was obtained via this electromagnetic heat hydrodistillation. In addition, the numerical relationships between magnetic field, induced electric field (IEF), induced current density, and temperature profile were elaborated; they were positively correlated with the extraction yield of essential oils. It was found that the waveforms of the magnetic field, induced electric field, and excitation voltage were not consistent. Using a higher magnetic field resulted in high current densities and terminal temperatures in the extracts, as well as higher essential oil yields. When the magnetic field strength was 1.39 T and the extraction time was 60 min, the maximum yield of essential oil reached 1.88%. Meanwhile, conventional hydrodistillation and ohmic heating hydrodistillation were conducted for the comparison; all treatments had no significant impact on the densities. In addition, the essential oil extracted by electromagnetic heat had the lowest acid value and highest saponification value. The proportion of monoterpenoids and oxygen-containing compounds of essential oil extracted by this proposed method was higher than the other two methods. In the end, the development of this electromagnetic heat originating from magnetic energy has the potential to recover high-value compounds from biomass waste. Full article
(This article belongs to the Special Issue Thermal and Non-thermal Technologies in Food Waste Processing)
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