Isolation of Caffeine from Tea Leaves
Extraction of Caffeine from Lipton® Tea Leaves
Nathaniel Camangon*, Kaila Bumagat, Franz Mari Burgos, Remigio Callanta
Department of Chemistry, College of Science, University of Santo Tomas, Manila, Philippines
Abstract This experiment mainly focuses on the extraction of pure caffeine by multiple extraction from commercially acquired tea leaves and determining its purity by melting point determination. A 0.02% yield of pure caffeine was obtained from 10.4978g of tea leaves (4 tea bags). The acquired pure caffeine’s purity was determined by melting point and was found to have a melting point range of 3℃. The temperature range of the melting point will serve as the basis of purity of the pure caffeine.
Introduction Caffeine is a bitter substance found in coffee, tea, soft drinks, chocolate, kola nuts, and certain medicines. It has many effects on the body 's metabolism, including stimulating the central nervous system. This can make us more alert and gives us, as well, a boost of energy. [1] And like most adults, caffeine has been a part of our daily routine. But do we know the caffeine content of our favorite drink? We may want to take a look at just how much caffeine we get in a typical day, especially if we’re bothered by restlessness, anxiety and the likes. According to the American Academy of Pediatrics, it is only recommended that adolescents gets no more than 100 mg of caffeine a day. [2] In this lab we will extract and purify caffeine from tea leaves. First water soluble compounds will be extracted from dry tea leaves with boiling water. Then, caffeine will be preferentially extracted from the water into organic solvent. The solvent will be removed and the crude material will be purified by sublimation This experiment has the following objectives: (1) to isolate caffeine using multiple extraction, (2) to purify caffeine using sublimation, (3) to determine the purity using melting point and (4) to calculate the % yield of the crude purified
Nathaniel Camangon*, Kaila Bumagat, Franz Mari Burgos, Remigio Callanta
Department of Chemistry, College of Science, University of Santo Tomas, Manila, Philippines
Abstract This experiment mainly focuses on the extraction of pure caffeine by multiple extraction from commercially acquired tea leaves and determining its purity by melting point determination. A 0.02% yield of pure caffeine was obtained from 10.4978g of tea leaves (4 tea bags). The acquired pure caffeine’s purity was determined by melting point and was found to have a melting point range of 3℃. The temperature range of the melting point will serve as the basis of purity of the pure caffeine.
Introduction Caffeine is a bitter substance found in coffee, tea, soft drinks, chocolate, kola nuts, and certain medicines. It has many effects on the body 's metabolism, including stimulating the central nervous system. This can make us more alert and gives us, as well, a boost of energy. [1] And like most adults, caffeine has been a part of our daily routine. But do we know the caffeine content of our favorite drink? We may want to take a look at just how much caffeine we get in a typical day, especially if we’re bothered by restlessness, anxiety and the likes. According to the American Academy of Pediatrics, it is only recommended that adolescents gets no more than 100 mg of caffeine a day. [2] In this lab we will extract and purify caffeine from tea leaves. First water soluble compounds will be extracted from dry tea leaves with boiling water. Then, caffeine will be preferentially extracted from the water into organic solvent. The solvent will be removed and the crude material will be purified by sublimation This experiment has the following objectives: (1) to isolate caffeine using multiple extraction, (2) to purify caffeine using sublimation, (3) to determine the purity using melting point and (4) to calculate the % yield of the crude purified
References: [1] Caffeine: MedlinePlus. (n.d.). National Library of Medicine - National Institutes of Health. Retrieved July 17, 2013, from http://www.nlm.nih.gov/medlineplus/caffeine.html [2] The Mayo Clinic diet: eat well, enjoy life, lose weight. (2010). Intercourse, PA: Good Books. [3] Extraction of Caffeine from Tea (Theory) : Biochemistry Virtual Lab II : Biotechnology and Biomedical Engineering : Amrita Vishwa Vidyapeetham Virtual Lab . (n.d.). Amrita Vishwa Vidyapeetham Virtual Lab . Retrieved July 18, 2013, from http://amrita.vlab.co.in/?sub=3&brch=64&sim=169&cnt=1 [4] Liquid/Liquid Extraction. (n.d.). PSU Chemistry. Retrieved July 17, 2013, from courses.chem.psu.edu/chem36/Experiments/PDF 's_for_techniques/Liquid_Liquid.pdf [5] Chemistry Online @ UTSC. (n.d.). Information & Instructional Technology Services | Information & Instructional Technology Services. Retrieved July 17, 2013, from http://webapps.utsc.utoronto.ca/chemistryonline/sublimation.php [6] Engel, R. G. (2011). Introduction to organic laboratory techniques: a small-scale approach (3. ed., International ed.). Singapore: Brooks/Cole, Cengage Learning.