A Proposed Method for Quantifying Thermal Exposure Incurred during Rough-Rice Drying
| Autor: | Terry J. Siebenmorgen, Seth Graham-Acquaah |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0303 health sciences
Moisture 030309 nutrition & dietetics Biomedical Engineering Thermal desorption food and beverages Soil Science Forestry 04 agricultural and veterinary sciences Thermal treatment Sterilization (microbiology) Pulp and paper industry 040401 food science 03 medical and health sciences 0404 agricultural biotechnology Desorption Environmental science Relative humidity Tempering Agronomy and Crop Science Water content Food Science |
| Zdroj: | Transactions of the ASABE. 64:475-484 |
| ISSN: | 2151-0040 |
| Popis: | HighlightsDrying conditions affect rice end-use functionality.Thermal exposure incurred by rough rice may differ depending on drying conditions.A framework is proposed for deriving an index that can show how much heat exposure rough rice incurs during drying.Abstract. Heated air is used to dry most rice in the U.S. Thus, commercial rice drying can be considered a thermal process that aims to remove moisture from rough rice until a desired moisture content is reached. Parallels can be drawn between rice drying and thermal sterilization that is targeted at reducing microbial load because moisture content reduction during drying follows similar decay rate kinetics as the reduction in microbial load during thermal sterilization. Given the different combinations of drying air conditions (air temperature and relative humidity), as well as drying and tempering durations, employed in various dryer designs for rice drying and the impact that these conditions have on rice end-use functionality, this study sought to derive a thermal treatment index (drying process values) that is similar to the F0 value concept used in thermal sterilization for quantifying and comparing the thermal exposure incurred by rice during drying under various scenarios. Using data collected from rough-rice drying experiments, a decimal desorption value (Dmv) that represents the duration required to cause a 90% reduction in moisture ratio during drying at a specified temperature was determined, from which a thermal desorption constant (Zmv) that represents the increase in temperature necessary to cause a 90% reduction in Dmv during drying was established. Subsequently, a thermal desorption value (Fmv) was derived to express the duration that a rice lot would have been heat treated at a reference temperature during drying to produce an equivalent effect on moisture content as that produced by the actual drying process. Keywords: End use, Moisture content, Peak viscosity, Postharvest, Relative humidity, Rice, Temperature. |
| Databáze: | OpenAIRE |
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