PPT-Lecture 3a Extraction of Caffeine from Tea Leaves

Caffeine Background Caffeine is a naturally occurring alkaloid that belongs to a class of compounds called xanthines It is found in varying quantities in the seeds leaves and fruits . Caffeine is found in numerous plants the most widely consumed being coffee tea cola nut cocao pod guarana and mat It is estimated that in North America between 80 and 90 percent of adults and children habitually consume caffeine About 15 of the gene Manmade caffeine is sometimes added to foods drinks and medicines Ninety percent of people in t he world use caffeine in one form or another In the US 80 percent of adul ts consume caffeine every day the average adult has an intake of 200 mg per da To the average Joe questioning the existence of caffeine addiction probably seems absurd The web abounds with quotes and expos57577s about the addictive nature of caffeine using catchy slogans about coffee that borrow from other substance addiction By Sarah French. Eng 104-43. November 16,2009. Addiction is defined as being abnormally tolerant to and dependant on something that is psychologically or physically habit forming. Once caffeine enters the blood stream it only takes minutes for the caffeine to reach the entire body . Jennifer Velez. Kaplan University. HW499. What is Caffeine?. Caffeine . is a chemical found it plants that stimulates . the . central nervous system (. CNS), heart, muscles, and the centers that control blood . Caffeine. Alkaloid. Purine Ring System. Stimulant (50 – 200 mg). Diuretic. Caffeine. Found in natural sources. Coffee. Tea. Kola nuts. Cocoa beans. Tea. Caffeine . 5% by weight. Soluble in hot water. Organics in MST using Micro Extraction with LVI . GC/MS. Method developed by Michael Muramoto. Presentation by Felix Zboralski. Objective & Challenge. . Develop . an Organic Analysis . method that is quick and economical and can be used to support microbial analysis in tracking waste water intrusion into storm water pathways. . Names. Anhydrous Caffeine. Cafeina. Caffeine Anhydrous Citrated. Caffeine . Trimethylxanthine. . Sodium . Benzonate. Scientific names. 1,3,7-Trimethylpurine-2,6-dione. C. 8. H. 10. N. 4. O. 2. Slang Terms. Sawada Taiki. Takahashi Y. usuke. （. Hayashi . Haruka. ）. I don’t feel sleepy!!!. . We are sometimes sleepy during class.. . . And . we drink energy . drink or coffee.. 　　. 　. Caffeine. Caffeine, the common name for . 1,3,7-trimethylxanthine. , . It belongs to a group of . methylxanthene. Sources of . caffein. Caffeine is a chemical . that is found naturally in the leaves and seeds of various plants. . CIS, LMU . München. Winter Semester . 2015-2016. . Dr. Alexander Fraser, CIS. Administravia. Suggested Klausur date is in the last week of the Vorlesung (the week before Fasching). Klausur: February . Extraction using hexane (Polarity 0.1) . Remaining Plant tissue. Hexane (H) extract residue. Extraction using diethyl ether (Polarity 2.8) . Remaining Plant tissue. Diethyl ether (DEE) extract residue. PART . II. Pure caffeine is a white, tasteless substance that makes up as much as 5% of the weight of tea leaves. Caffeine found in deoxyribonucleic acid (DNA).. Many natural products contain caffeine that helps the nerve system to be relaxed and . Protoalkaloids. . By: Noor . Hisham. Al-. Atraqchi. MSc . pharmacognosy. The purines are consisting of a six-membered pyrimidine ring fused to a five-membered imidazole . ring.. three well-known examples are :.