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2018 Volume 43 Issue 4
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ZHANG Feng-xiu ZHU Lin ZHANG Guang-xian. Research on Ultrasonic Assisted with Ethanol to Extract Caffeine from Green tea for University Teaching Experiment[J]. Journal of Southwest China Normal University(Natural Science Edition), 2018, 43(4): 63-68.
Citation: ZHANG Feng-xiu ZHU Lin ZHANG Guang-xian. Research on Ultrasonic Assisted with Ethanol to Extract Caffeine from Green tea for University Teaching Experiment[J]. Journal of Southwest China Normal University(Natural Science Edition), 2018, 43(4): 63-68.
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Research on Ultrasonic Assisted with Ethanol to Extract Caffeine from Green tea for University Teaching Experiment

  • college of Chemistry and Chemical Engineering, Southwest University; college of Textile Garment, Southwest University;

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  • In this paper, the best scheme on caffeine extraction from green tea has been investigated by a method of combining ultrasonic assisted with ethanol extraction.The best extraction parameters have been optimized by using single-factor and orthogonal tests.The results indicate that after ultrasonic pretreatment of green tea in 95%alcohol solution for 5 min, the amount of caffeine extraction is highest in which 99 mg caffeine per 6 g green tea can be extracted and the extraction rate reaches 82.5% under the best test condition that is 20% ultrasonic power ratio, 100 mL 95%alcohol and 60 min extraction at 70℃.The extraction method exhibits many advantages such as simple, no environmental pollution, aproduct of high purity and high extraction efficiency.The gained optimal parameters can be applied in both teaching experiment and industrial production.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Research on Ultrasonic Assisted with Ethanol to Extract Caffeine from Green tea for University Teaching Experiment

Abstract: In this paper, the best scheme on caffeine extraction from green tea has been investigated by a method of combining ultrasonic assisted with ethanol extraction.The best extraction parameters have been optimized by using single-factor and orthogonal tests.The results indicate that after ultrasonic pretreatment of green tea in 95%alcohol solution for 5 min, the amount of caffeine extraction is highest in which 99 mg caffeine per 6 g green tea can be extracted and the extraction rate reaches 82.5% under the best test condition that is 20% ultrasonic power ratio, 100 mL 95%alcohol and 60 min extraction at 70℃.The extraction method exhibits many advantages such as simple, no environmental pollution, aproduct of high purity and high extraction efficiency.The gained optimal parameters can be applied in both teaching experiment and industrial production.

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