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Model-Based Real Time Operation of the Freeze-Drying Process
Open AccessFeature PaperReview

Effect of Freeze-Drying on Quality and Grinding Process of Food Produce: A Review

1
Department of Food Science and Biotechnology, College of Agricultural and Life Science, Kangwon National University, Chuncheon 24341, Korea
2
Elderly-Friendly Food Research Center, Agriculture and Life Science Research Institute, Kangwon National University, Chuncheon 24341, Korea
*
Author to whom correspondence should be addressed.
Processes 2020, 8(3), 354; https://doi.org/10.3390/pr8030354
Received: 30 January 2020 / Revised: 5 March 2020 / Accepted: 12 March 2020 / Published: 20 March 2020
(This article belongs to the Special Issue Drying Kinetics and Quality Control in Food Processing)
Freeze-drying is an important processing unit operation in food powder production. It offers dehydrated products with extended shelf life and high quality. Unfortunately, food quality attributes and grinding characteristics are affected significantly during the drying process due to the glass transition temperature (during drying operation) and stress generated (during grinding operation) in the food structure. However, it has been successfully applied to several biological materials ranging from animal products to plants products owning to its specific advantages. Recently, the market demands for freeze-dried and ground food products such as spices, vegetables, and fruits are on the increase. In this study, the effect of the freeze-drying process on quality attributes, such as structural changes, the influence of glass transition during grinding, together with the effect on grinding efficiency in terms of energy requirement, grinding yield, and morphological changes in the powder as a result of temperature, drying time were discussed. An overview of models for drying kinetics for freeze-dried food sample, and grinding characteristics developed to optimize the drying processes, and a prediction of the grinding characteristics are also provided. Some limitations of the drying process during grinding are also discussed together with innovative methods to improve the drying and grinding processes. View Full-Text
Keywords: freeze-drying; grinding; kinetic model; grinding characteristics freeze-drying; grinding; kinetic model; grinding characteristics
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Oyinloye, T.M.; Yoon, W.B. Effect of Freeze-Drying on Quality and Grinding Process of Food Produce: A Review. Processes 2020, 8, 354.

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