<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The research material was prune plums (<italic>Prunus domestica</italic> L.), subjected to osmotic pre-treatment, with variable process time parameters and osmotic solution concentration. Plums thus fixed were frozen and stored for 6 months. At even (monthly) intervals, the product was defrosted by the vacuum-steam method, using the s-p-p chamber, until the thermocouple indicated a temperature of 4ºC in the sample’s thermal center. In order to study the kinetics of phenomena occurring during the defrosting process, the chamber was equipped with a measuring system to enable measurement and recording of temperature changes in time in the geometric center of the sample, as well as the temperature on the sample surface. The conducted tests proved that the time of vacuum-steam defrosting of fruit depended on the amount of water contained in it. In plums dehydrated in 45-65% sucrose solutions, duration of the defrosting process was shortened already after three months of frozen storage. After 6 months of storage, defrosting of these fruits was twice as fast as that of control samples.</p></abstract>

The research material was prune plums (Prunus domestica L.), subjected to osmotic pre-treatment, with variable process time parameters and osmotic solution concentration. Plums thus fixed were frozen and stored for 6 months. At even (monthly) intervals, the product was defrosted by the vacuum-steam method, using the s-p-p chamber, until the thermocouple indicated a temperature of 4ºC in the sample’s thermal center. In order to study the kinetics of phenomena occurring during the defrosting process, the chamber was equipped with a measuring system to enable measurement and recording of temperature changes in time in the geometric center of the sample, as well as the temperature on the sample surface. The conducted tests proved that the time of vacuum-steam defrosting of fruit depended on the amount of water contained in it. In plums dehydrated in 45-65% sucrose solutions, duration of the defrosting process was shortened already after three months of frozen storage. After 6 months of storage, defrosting of these fruits was twice as fast as that of control samples.

Analysis of the Vacuum-Steam Defrosting Process of Plums Pre-Treated with Dehydrofreezing

Department of Machinery Exploitation and Management of Production Processes

Department of Agricultural Machines and Equipment

Agricultural Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The research material was prune plums (Prunus domestica L.), subjected to osmotic pre-treatment, with variable process time parameters and osmotic solution...

Analysis of the Vacuum-Steam Defrosting Process of Plums Pre-Treated with Dehydrofreezing

Published Online: Mar 30, 2020

Page range: 103 - 111

Received: Jan 01, 2020

Accepted: Mar 01, 2020

DOI: https://doi.org/10.1515/agriceng-2020-0010

Keywords
plums, chamber, defrosting, dehydrofreezing, process

© 2020 Agnieszka Szparaga et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Analysis of the Vacuum-Steam Defrosting Process of Plums Pre-Treated with Dehydrofreezing

Published Online: Mar 30, 2020

Page range: 103 - 111

Received: Jan 01, 2020

Accepted: Mar 01, 2020

DOI: https://doi.org/10.1515/agriceng-2020-0010

Keywordsplums, chamber, defrosting, dehydrofreezing, process

© 2020 Agnieszka Szparaga et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
plums, chamber, defrosting, dehydrofreezing, process