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Highly Selective and Considerable Subcritical Butane Extraction to Separate Abamectin in Green Tea
Yating Zhang1, Lingbiao Gu1, Fei Wang2
1School of Physics and Engineering, Zhengzhou University.
Journal of Oleo Science
|May 19, 2017
Summary
Subcritical butane extraction effectively separates abamectin pesticide from tea leaves, optimizing conditions for high efficiency and minimal impact on tea quality. This method preserves aroma and significantly reduces other compounds.
Area of Science:
- Agricultural Chemistry
- Food Science
- Analytical Chemistry
Background:
- Pesticide residues in tea pose health risks.
- Effective methods for abamectin removal from tea are needed.
Purpose of the Study:
- To develop and optimize a subcritical butane extraction method for abamectin removal from tea leaves.
- To evaluate the impact of this extraction method on tea quality.
Main Methods:
- Subcritical butane extraction was employed.
- Response surface methodology (Box-Behnken design) was used for parameter optimization (temperature, time, cycles, solid-liquid ratio).
- High-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) were used for analysis.
Main Results:
- Optimal conditions: 42°C, 1 cycle, 30 min, 1:10 solid-liquid ratio.
- Achieved 93.95% separation efficiency for abamectin.
- Minimal loss of aroma components; slight reduction in catechins (0.7%-13.1%), caffeine (1.81%), and theanine (2.6%).
Conclusions:
- Subcritical butane is effective for extracting lipid-soluble pesticides like abamectin from tea.
- The optimized method is efficient and preserves desirable tea components, making it a practical approach.
