Make my struggle
Experiment
4
Isolation of Caffeine from Tea Leaves
Objectives
1)
To insulate caffeine from dry tea leaves by extraction and purify the crude select by
recrystallization.
2)
To determine the mass percentage of caffeine in the supper leaves.
Introduction
Caffeine is probably the principally commonly used addictive drug. It belongs to a huge class
of organic compounds called alkaloids, which vary widely in structure and reactivity. All
alkaloids regard a nitrogen atom that allows greatest part of them to accept a proton (H+) and act for the re~on that a
base, or alkaline substance. The distinction “alkaloid” comes from this characteristic. Alkaloids are
usually originate in plants. They usually taste distressing and often are physiologically active in humans.
The names of some of these compounds are familiar to you not only so if the structures are not:
nicotine, sulphate of morphia, strychnine, and cocaine. The roles these compounds do in the plants in
which they are plant is not well understood. In some cases they may act as pesticides; nicotine
is ground in tobacco and has been sprayed onto other plants to form as an insecticide. The
structure of caffeine is shown in hell. It can be considered to subsist constructed from purine ring
system, what one. is important biologically, being found in nucleic acids and in many.
Caffeine is found in a tell off of foods and beverages. The list below lists some of
them. Caffeine acts like a stimulant. It stimulates the seat of life, respiration, the central nervous
system, and is a diuretic. Its appliance can cause nervousness, insomnia and headaches. It is
physically addictive. A part who drinks as few as 4 wassail of coffee a day and who attempts to
24
block “cold turkey” may experience headache, sleeplessness, and possibly nausea as the originate of
withdrawal.
Coffee
80125 mg for cup
Coffee, decaf ...
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