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Updated: Jan 21, 2026

Treating Surfaces with a Cold Atmospheric Pressure Plasma using the COST-Jet
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Development and Optimization of Cold Plasma Pretreatment for Drying on Corn Kernels.

Shuai Li1,2, Shanshan Chen1, Feng Han3

  • 1School of Food Science and Engineering, Jilin Univ., Changchun, 130022, PR China.

Journal of Food Science
|July 30, 2019
PubMed
Summary

Cold plasma pretreatment significantly enhances hot-air drying efficiency for corn kernels. This method optimizes drying time and rate, offering potential energy savings in grain processing.

Keywords:
cold plasma pretreatmentcorn kernelsdryingoptimization

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Area of Science:

  • Agricultural Engineering
  • Food Science and Technology
  • Plasma Physics

Background:

  • Hot-air drying of corn kernels is a crucial process in agriculture.
  • Optimizing drying parameters is essential for efficiency and quality preservation.
  • Cold plasma technology presents a novel approach for surface modification and pretreatment.

Purpose of the Study:

  • To optimize the cold plasma pretreatment process for hot-air drying of corn kernels.
  • To investigate the effects of plasma pretreatment time, power, and drying temperature on drying kinetics.
  • To determine the optimal operational conditions for improved drying efficiency.

Main Methods:

  • Utilized a Box-Behnken design for optimizing three factors: plasma pretreatment time, power, and drying temperature.
  • Established polynomial equations to model the relationship between process parameters and drying outcomes.
  • Employed Atomic Force Microscopy (AFM) to analyze surface topography changes.

Main Results:

  • Identified optimal conditions: 52.5 °C drying temperature, 50 s plasma pretreatment time, and 500 W plasma power.
  • Achieved a drying rate of 3.6163 (g/g h⁻¹) and a drying time of 1.29 hours under optimal conditions.
  • AFM revealed micro-hole formation on the corn kernel surface due to plasma treatment, explaining enhanced drying.

Conclusions:

  • Cold plasma pretreatment effectively improves the hot-air drying efficiency of corn kernels.
  • The process shows potential for reducing energy consumption in grain drying applications.
  • Cold plasma pretreatment is a promising technology for the broader grain drying industry.