Exp 5 Flashcards
Two main principal varieties of tea plants
Small leaved china plant
Large leaved assam plant
Small leaved china plant scientific name
Camellia sinensis sinensis
Large leaved assam plant scientific name
Camellia sinensis assamica
Unfermented teas
Green tea
Fermented tea
Black tea
Partially fermented tea
oolong
A member of the class called alkaloids
caffeine
In which class does caffeine belong
alkaloids
What are examples of caffeine
Cocoa beans
Coffee beans
Kola nuts
Tea leaves
Formula of caffeine
C8H10N402
What is the IUPAC name of caffeine
1,3,7 trimethylxanthine
Caffeine is a stimulant for (3)
CNS
Heart
respiration
Caffeine pharmacologic effect
Stimulant
diuretic
Caffeine can cause
Insomnia
Headaches
nervousness
tea leaves composition
caffeine
ceullulose
small amount of chlorophyll
tannins
a water insoluble polymer of glucose
cellulose
how is caffeine extracted from water with
with dichloromethane (methylene chloride)
anhydrous sodium sulfate or -
calcium chloride
how is solid/liquid extraction done
using soxhlet extractor or by brewing a cup of tean
in order to get the solid natural product into the liquid solvemt
solid/liquid extraction
isolate the desired reaction compounds from the natural product
liquid/liquid extraction
liquid/liquid extraction can be
neutral or acid/base
Caffein extraction is
acial base liquid/liquid extraction
ideal solvent should be
low BP
not react with the solute other solvents
not toxic or highly flammable
not be miscible with water
be inexpensive
readily dissolve caffeine
Common liquid/liquid solvent pair for the extraction of caffeine is
water-dichloro methane
Caffeine layer is located
below the aqueous layer
in our experiment it was above
liquid w lower density is above
______ of the solvent, dichloro methane, would leave a crude version of caffeine
evaporation
______ would produce more pure version of caffeine
sublimation
method to purity caffeine
sublimation
caffeine can also be extracted by using
a vacuum filtration
Caffeine is metabolized in and by the??
in the liver by the cytochrome P450
what specific cyp?
CYP1A2
Disadvantages of caffeine
Anxiety
causes physical dependance
sleep disturbances
Caffeine advantages
exercise performance
improving alertness
learning capacity
E FSA meaning
European Food safety Authority
caffeine intake advise
400 mg per day and single doses of 200 mg
single doses it _____mg may increase sleep latency and reare sleep duration in some adult individuals, particularly when consumed close to bedtime
100 mg
