茶叶中咖啡因的提取实验装置的改进与探索

doi:10.3866/PKU.DXHX201807053

University Chemistry ›› 2019, Vol. 34 ›› Issue (3): 42-46.doi: 10.3866/PKU.DXHX201807053

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Improvement and Exploration of Experimental Setup for Extraction of Caffeine from Tea

Yunying WU¹,Jianxin XIE¹,Xianxue WU¹,Wenjing CHEN¹,Gaozhang GOU^2,*()

¹ College of Chemistry Biology and Environment, Yuxi Normal University, Yuxi 653100, Yunnan Province, P. R. China
² School of Science, Honghe University, Mengzi 661199, Yunnan Province, P. R. China

Received:2018-07-28 Accepted:2018-09-04 Published:2019-03-09
Contact: Gaozhang GOU E-mail:hhxylxyhxx@126.com
Supported by:
玉溪师范学院教学改革研究与实践项目(201739);红河学院教学建设与改革项目(JJG171009);云南省教育厅科学研究基金项目资助(2018JS421);云南省应用基础研究计划青年项目(2017FD155)

Abstract

Abstract:

The extraction experiment of caffeine from tea was a classic experiment in Organic Chemistry Laboratory. In this paper, the original Soxhlet extractor device used in the experiment was modified and obtained the internal ventilation Soxhlet extractor, which was used in laboratory teaching. The extraction effects of the improved Soxhlet extractor and the original Soxhlet extractor were compared by the control experiment. The results showed that the improved device keeps the function and characteristics of the original devicewith the shorter the extraction time, higher extraction temperature and the extraction rate. Thus, it may provide an alternative for college organic laboratory teaching.

Key words: Caffeine, Organic chemistry laboratory, Soxhlet extractor, Device improvement

Yunying WU,Jianxin XIE,Xianxue WU,Wenjing CHEN,Gaozhang GOU. Improvement and Exploration of Experimental Setup for Extraction of Caffeine from Tea[J].University Chemistry, 2019, 34(3): 42-46.

Figures/Tables 4

References 14

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	平行次数	提取时间/h	首次虹吸用时/min	总虹吸次数/次	虹吸一次平均用时/min	提取筒上部温度/℃	提取筒中部温度/℃	提取筒下部温度/℃	咖啡因质量/g	提取率/%	平均提取率/%
原索氏提取器	1	1	20	7	8.6	60	58	61	0.0583	0.583	0.5817
	2	1	19	8	7.5	61	58	61	0.0575	0.575
	3	1	18	8	7.5	60	59	60	0.0587	0.587
改进索氏提取器	1	1	15	9	6.7	67	67	68	0.0646	0.646	0.6497
	2	1	15	10	6.0	67	68	68	0.0649	0.649
	3	1	14	10	6.0	68	68	68	0.0654	0.654

	提取时间/h	虹吸次数/次	咖啡因质量/g	提取率/%
原索氏提取器	0.5	2	0.0254	0.254
	1	8	0.0575	0.575
	1.5	10	0.0587	0.587
	2	15	0.0605	0.605
改进索氏提取器	0.25	1	0.0474	0.474
	0.5	7	0.0621	0.621
	1	10	0.0649	0.649
	1.5	15	0.0663	0.663
	2	19	0.0670	0.670

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Improvement and Exploration of Experimental Setup for Extraction of Caffeine from Tea

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