Experiment#4: Isolation of Caffeine from Dried Tea Leaves

A basic alkaloid from the Methylxanthine family. [1,3,7 - trimethylxanthine]

In this compund’s pure form, it is odorless, white and fleecy.

CAFFEINE Caffeine is an alkaloid from what family exactly?

CAFFEINE Caffeine has the _____ ___ system, a framework that plays an important role in living systems.

CAFFEINE Caffeine is odorless, has a bitter taste and is ___ ____ in water.

CAFFEINE Medications designed to increase the amount of water and salt expelled from the body as urine. Caffeine acts as one of these.

CAFFEINE The stimulation of the heart resulting in a relaxation of the blood vessels.

CAFFEINE A) Small doses of Caffeine (50-200 mg) and b) high doses of Caffeine (over 200 mg) result in what sort of effects on the human body?

COMPOSITION OF TEA LEAVES The principal structural material of all plant cells. Tea leaves are primarily made up of this.

COMPOSITION OF TEA LEAVES Cellulose is insoluble in water, and thus can be separated from caffeine by…?

TYPES OF TEA This type of tea is produced through complete fermentation.

TYPES OF TEA Catechins, which make up 20% of black tea’s dry weight, is oxidized during fermentation to form _________ and ___________.

TYPES OF TEA These contribute to the sensory characteristic bright orange-red color of black tea.

COMPOSITION OF TEA LEAVES Basic nitrogen containing compounds found in plants.

TYPES OF TEA These leaves for this tea are heated immediately after harvesting, mechanically wound and compressed, and then dried to ensure the preservation of color.

COMPOSITION OF TEA LEAVES Astringent, bitter plant polyphenols that either bind and precipitate or shrink proteins that have acidic behavior.

COMPOSITION OF TEA LEAVES Colored polyphenolic compounds of high molecular weight that thave acidic behavior and are water-soluble complex substances.

COMPOSITION OF TEA LEAVES As much as __% by weight of the leaf material in tea plants consists of caffeine.

TYPES OF TEA Also known as silver needle tea, this type of tea is a slightly-fermented type of tea.

TRUE or FALSE | COMPOSITION OF TEA LEAVES Chlorogenic Acids are water soluble and have acidic properties.

TRUE or FALSE | COMPOSITION OF TEA LEAVES Plant fats are soluble due to them having large hydrophilic groups present in their molecular structure.

The body’s secondary source of energy (the first being glucose). This contains a high percentage of saturated fatty acids.

COMPOSITION OF TEA LEAVES Any type of colored substance produced by a plant.

COMPOSITION OF TEA LEAVES Based on the Schematic Procedure during the post-lab discussion, provide the 4 possible Insoluble Cellular Materials present in tea leaves.