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Developing Effective Radio Frequency Vacuum Drying Processes for Moutan Cortex: Effect on Moisture Migration, Drying

Zepeng Zang1, Fangxin Wan1, Haiwen Jia1

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Foods (Basel, Switzerland)
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Summary

Radio frequency vacuum (RFV) drying significantly enhances Moutan Cortex quality by reducing dehydration time and increasing drying rates. Optimal conditions preserve color, bioactive compounds, and cellular structure for industrial processing.

Keywords:
Moutan Cortexdrying kineticsmicrostructurephysicochemical qualityradio frequency vacuum

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Area of Science:

  • Agricultural Engineering
  • Food Science
  • Traditional Chinese Medicine Processing

Background:

  • Moutan Cortex quality degrades post-harvest, necessitating efficient processing.
  • Traditional drying methods are energy-intensive and can compromise quality.
  • Radio frequency vacuum (RFV) drying offers a potential solution for rapid and high-quality dehydration.

Purpose of the Study:

  • To optimize RFV drying parameters for Moutan Cortex.
  • To evaluate the impact of RFV drying on drying kinetics, quality, and microstructure.
  • To reduce energy consumption during Moutan Cortex processing.

Main Methods:

  • Investigated effects of drying temperature, plate spacing, and vacuum degree on Moutan Cortex.
  • Utilized radio frequency vacuum (RFV) technology for dehydration.
  • Analyzed drying kinetics, physicochemical properties, and microstructure.

Main Results:

  • RFV drying reduced dehydration time by 10.71-28.57% and increased drying rate by 15.79-54.39% compared to hot-air drying.
  • Optimal conditions (50 °C, 90 mm spacing, 0.025 MPa vacuum) preserved color, polysaccharides, phenolics, flavonoids, and key compounds.
  • RFV drying prevented cellular shrinkage, creating a porous structure for efficient moisture removal.

Conclusions:

  • RFV drying is an effective method for improving Moutan Cortex post-harvest quality.
  • Optimized RFV parameters provide a theoretical basis for industrial application.
  • This technology offers reduced energy consumption and enhanced product quality.