NATURAL PRODUCT RESEARCH AND DEVELOPMENT ›› 2017, Vol. 29 ›› Issue (3): 489-496. doi: 10.16333/j.1001-6880.2017.3.023

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Optimization of Ionic Liquids Extraction of Caffeine from the Discarding Tea by Box-Behnken Design and Response Surface Analysis

HUANG Fei1*,XU Hui-min1,WANG Jie1,HUANG Tao1,HUANG Cheng-xiang1,WU Kong-lin2   

  1. 1 College of Chemistry and Chemical Engineering,Huangshan University,Huangshan 245041,China;2College of Chemistry and Materials Science,The Key Laboratory of Functional Molecular Solids, Ministry of Education,Anhui Normal University,Wuhu 241000,China
  • Online:2017-03-31 Published:2017-04-06

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Abstract: With extraction yield of caffeine as evaluation index,the effects of liquid-solid ratio,extraction temperature,extraction time,concentration of ionic liquids ［HSO3-pmim］+［HSO4］- were investigated through Box-Behnken design and response surface methodology based on single factor experiment.The results suggested that the optimal conditions of extraction technology were as follows:liquid-solid ratio was 0.05 g/mL,extraction time was 160 min,extraction temperature was 90 ℃,ionic liquids［HSO3-pmim］+［HSO4］- concentration was 70%.Under these conditions the extraction yield of caffeine was 95.1 mg/ 5g tea sample.The optimized extraction technology was reasonable,simple,precise and with good predictability.

Key words: Box-Behnken design and response surface methodology, ionic liquids［HSO3-pmim］+［HSO4］-, discarding tea, caffeine

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