Isolation of Caffeine from Tea Leaves - 1831 Words

Isolation of Caffeine from Tea Leaves Introduction Caffeine is a member of the class of compounds organic chemists call alkaloids. Alkaloids are nitrogencontaining basic compounds that are found in plants. They usually taste bitter and often are physiologically active in humans. The names of some of these compounds are familiar to you even if the structures aren’t: nicotine, morphine, strychnine, and cocaine. The role or roles these compounds play in the life of the plants in which they are found is not well understood. In some cases they may act as pesticides; nicotine is found in tobacco and has been sprayed onto other plants, in which it is not found, to function as an insecticide. The structure of caffeine is shown to the right. It†¦show more content†¦Detergents and soap are surfactants. It is the purpose of surfactants to cause materials that do not dissolve in water (like oil, grease and dichloromethane) to form an emulsion with water. We want to be able to separate the aqueous phase from the dichl oromethane phase, so the last thing we want is an emulsion of the two. Consequently, as you extract the caffeine from the water into the dichloromethane do not shake the separatory funnel vigorously. The flow diagram below summarizes the extraction portion of the experiment. insoluble material: cellulose, etc. tea leaves hot water solids aqueous tannin salts, water-soluble aqueous phase water-soluble material: Na 2CO3 mainly tannins, caffeine caffeine dichloromethane phase ArO- Na + + Na + HCO3tannin salts -soluble in water, insoluble in dichloromethane ArOH + Na +2CO3-2 tannins -soluble in water, dichloromethane Experiment #6 Procedure Isolation of Caffeine from Tea Leaves Page 3 1. Open two tea bags by removing the staple, trying to not tear the paper. Weigh the total contents to the nearest milligram and record this weight. Place the tea back into the bags and staple the bags shut. 2. Place the tea bags into the bottom of a clean, but not necessarily dry, 150 ml beaker. Add 30 ml of deionized water and 2.0 g of anhydrous sodium carbonate. Place the beaker on a wire gauze supported by a ring on a ringShow MoreRelatedCaffeine Lab Report769 Words   |  4 PagesIsolation of a Natural product, in the experiment caffeine [C8H10N4O2], is based on a series of procedures. Firstly, it is important to examine the structure of caffeine which is an alkaloid. Typically alkaloids are nitrogen based and found in plants, caffeine itself is composed of a purine ring with functional groups of a amide, amine and alkene respectively. Furthermore, Caffeine includeds a lone pair on the nitrogen atom asserting several functional properties(Zhao et al. 206). 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