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Turmeric (Curcuma longa L.) drying: an optimization approach using microwave-vacuum drying.

Sathira Hirun1, Niramon Utama-Ang2, Paul D Roach3

  • 1Division of Food Science and Technology, Faculty of Agro-industry Chiang Mai University, Chiang Mai, Thailand.

Journal of Food Science and Technology
|September 6, 2014
PubMed
Summary

High microwave power (3,500-4,000 W) and longer drying times (27-30 min) optimize dried turmeric quality. This method enhances antioxidant and curcuminoid content while inhibiting enzymatic browning.

Keywords:
CurcuminoidsDehydrationMicrowave-vacuumOptimizationTurmeric

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Area of Science:

  • Food Science and Technology
  • Agricultural Engineering

Background:

  • Turmeric quality is affected by drying parameters.
  • Optimizing drying is crucial for preserving bioactive compounds and sensory attributes.

Purpose of the Study:

  • To investigate the impact of microwave power and drying time on dried turmeric quality.
  • To optimize vacuum-microwave drying conditions for enhanced turmeric quality using Response Surface Methodology.

Main Methods:

  • Vacuum-microwave drying experiments were conducted varying power (2,400-4,000 W) and time (10-30 min).
  • Quality parameters including color (L*, a*, b*), moisture content, water activity (aw), ash, antioxidant activity (DPPH), total phenolics, and curcuminoids were analyzed.
  • Response Surface Methodology (RSM) with a central composite design was used to model and optimize drying parameters.

Main Results:

  • Optimal drying conditions (3,500-4,000 W, 27-30 min) significantly improved water activity, color values (L*), moisture content, phenolic content, and curcuminoid content.
  • High microwave power and extended drying times enhanced antioxidant activity (EC50) and curcuminoid levels.
  • Enzymatic browning was inhibited by suppressing polyphenol oxidase activity, preserving color and bioactive compounds.

Conclusions:

  • Vacuum-microwave drying at high power and long durations is effective for producing high-quality dried turmeric.
  • Optimized conditions preserve turmeric's color, bioactive compounds, and antioxidant properties.
  • The study provides a framework for optimizing drying processes for other agricultural products.