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Optimization of Microwave-Assisted Extraction of Water-Soluble Dietary Fiber from Zingiber striolatum Diels Fruits by Response Surface Methodology

CHEN Shi-xue1, YU Jian-ping2,*, YANG Jun3, DAI Ming1   

  1. 1. Key Laboratory of Special Animal and Plant Resource in Fanjing Mountain, College of Material and Chemical Engineering,
    Tongren University, Tongren 554300, China; 2. College of Life Science, Guizhou University, Guiyang 550025, China;
    3. Yinjiang Knife Dam Junior High School, Yinjiang 555200, China
  • Online:2014-09-25 Published:2014-09-17
  • Contact: YU Jian-ping

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Abstract:

The microwave-assisted extraction of water-soluble dietary fiber (SDF) from Zingiber striolatum Diels fruits
was optimized by response surface methodology. An experimental design was carried out involving four variables at three
levels each. An extraction time of 151.4 s with a microwave power of 264 W using sulphuric acid solution at pH 3.65 as
the extraction solvent with a solid-to-solvent ratio of 1:33 (g/mL) was found to be optimal. Experiments carried out under
the optimized conditions resulted in an extraction yield of 5.52%, agreeing with the predicted value (5.75%). The extraction
procedure presented in this study is characterized by time saving, low energy consumption and high extraction efficiency.

Key words: wild Zingiber striolatum Diels, water-soluble dietary fiber, microwave-assisted extraction, response surface methodology

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