Courses for Kids
Free study material
Offline Centres


Last updated date: 29th Feb 2024
Total views: 299.7k
Views today: 4.99k
hightlight icon
highlight icon
highlight icon
share icon
copy icon

Introduction to Caffeine

Caffeine may be a bitter and white crystalline purine that is a methylxanthine alkaloid and is chemically associated with the adenine and guanine bases of desoxyribonucleic acid and RNA. It is found within the seeds, fruits, nuts, or leaves of a variety of plants. These plants belong to a native of Africa, East Asia, and South America. These help to guard them against herbivores and from the competition by preventing the germination of nearby seeds. It also encourages consumption by select animals like honey bees. 

The best-known source of caffeine is the coffee bean, the seed of the coffee plant. People may drink beverages containing caffeine to alleviate or prevent drowsiness. To make these drinks, caffeine is extracted by steeping the plant product in water, through a process called infusion. Caffeine-containing drinks, like coffee, tea, and cola, are consumed globally in high volumes. In 2020, almost 10 million tonnes of coffee beans were consumed globally.

The world's primary source of caffeine is the coffee berry, from which coffee is brewed. The caffeine content in coffee varies widely depending on the type of coffee bean and the method of preparation used. Generally, dark-roast coffee has less caffeine than lighter roasts because the roasting process reduces the bean's caffeine content. Arabica coffee normally contains less caffeine than the robusta variety.

[Image will be Uploaded Soon]

Caffeine Structure and Chemical Formula

Caffeine is a methylxanthine alkaloid that is found in the seeds, nuts, or leaves of a number of plants native to South America and East Asia. These are structurally related to adenosine and act primarily as an adenosine receptor antagonist with psychotropic and anti-inflammatory activities. Upon ingestion, caffeine binds to adenosine receptors in the central nervous system, which inhibits adenosine binding. Stimulating the activity of the medullary, vagal, vasomotor, and respiratory centres within the brain. This agent also promotes neurotransmitter release that further stimulates the CNS. The anti-inflammatory effects of caffeine are due to the inhibition of the intracellular concentration of cyclic AMP (cAMP), which activates protein kinase A. It also inhibits leukotriene synthesis, which results in reduced inflammation and natural immunity.

Caffeine Chemistry is as Follows:

Caffeine IUPAC name is as follows 1, 3, 7-Trimethylpurine-2,6-dione, is an organic compound that is part of the list of the Most Essential Medicines of the WHO. It is also part of the much-extended drink coffee and is a very popular stimulant. The caffeine chemical formula is C\[_{8}\]H\[_{10}\]N\[_{4}\]O\[_{2}\] and its molar mass is 194.19 g mol\[^{-1}\].

Caffeine Chemical Structure

The molecule may be a typical natural alkaloid that is formed by a pyrimidinedione consisting of a six-member ring with two nitrogen atoms. And an imidazole is a five-member ring with two nitrogen atoms rings that are fused. Its chemical structure is often written as below, within the common representations used for organic molecules.

[Image will be Uploaded Soon]

Caffeine Physical and Chemical Properties

Physical Properties: Caffeine molecules are usually obtained from different plants which are cultivated thereupon purpose. It is calculated that tea or coffee leaves contain a maximum of five% of caffeine. The caffeine is isolated by extraction using organic solvents and through the process of a high-pressure extraction, it's obtained a maximum possible quantity of caffeine. There are a couple of methods to organize caffeine in chemical laboratories. These methods include the reaction between dimethylurea and malonic acid.

Chemical Properties: Caffeine may be a stimulant of the central nervous system. It is suspected the mechanism of action involved reversibly blocks the action of adenosine in some receptors and thus, it stimulates the nervous system. The caffeine molecule can act this way because the molecule structure is very almost like an adenosine molecule, particularly on the part like the nitrogen base adenine.

Caffeine Molecule Side Effects

  • When taken by mouth, caffeine is safe for most healthy adults when used in doses of up to 400 mg per day. This amount of caffeine is analogous to what's found in about four cups of coffee.

  • Caffeine is possibly unsafe when taken by mouth for a long time or in high doses supposedly greater than 400 mg per day. Caffeine can cause insomnia, nervousness and restlessness, stomach irritation, nausea, increased pulse and respiration, and other side effects. Larger doses might cause headaches, anxiety, agitation, and pain.

  • Caffeine when taken orally in very high doses can cause health issues because it can cause irregular heartbeats and even death. Products with very concentrated or pure caffeine have a high risk of getting used in doses that are too high. So, one should avoid using these products.

  • Bipolar disorder, by the excessive amount of caffeine consumption that might make this condition worse. In one case, a 36-year-old man with controlled manic depression was hospitalized with symptoms of mania. After drinking several cans of an energy drink containing caffeine, taurine, and other ingredients over a period of four days. Use caffeine with care and in low amounts if you've got manic depression.

  • There is concern that caffeine might aggravate bleeding disorders. Use caffeine with care if you've got a bleeding disorder.

  • Caffeine can increase the quantity of calcium that can be flushed through urine. If one has got osteoporosis or low bone density, caffeine should be limited to but 300 mg per day. If a person is generally healthy and getting enough calcium from food or supplements, then in such persons taking over 400 mg of caffeine per day doesn't seem to increase the risk of getting osteoporosis. Older women with a genetic disease that affects the way vitamin D is employed should use caffeine with caution. Vitamin D works with calcium to build bones.


Caffeine may be a stimulant of the central nervous system of the methylxanthine class. It is the world's most generally consumed mind-altering drug. There are several known mechanisms of action to elucidate the consequences of caffeine. The most prominent is that it has the capability to reversibly block the action of adenosine on its receptors. Consequently, it can also prevent the onset of drowsiness that is induced by adenosine. Certain portions of the autonomic nervous system can be stimulated by caffeine.

FAQs on Caffeine

1. Is Caffeine Alkaloid Addictive?

Ans: There is no fact that caffeine addiction is not as intense or dangerous as drug addiction. One may feel addicted or hooked to it and it is often dangerous to overdo it. By experimenting one can see how they feel with and without low to moderate amounts of caffeine. In some people, when they consume caffeine or when they stop consuming it they don’t feel any change.

Those who disagree with the idea that people can be dependent on caffeine point to the fact. The studies do not show that 100% of people who consume caffeine experience symptoms of withdrawal or dependence. Instead of the addiction aspect, they believe that the pleasurable aroma, social aspects, and taste of coffee are the explanations for consumption.

2. Write Down the Caffeine Molecular Formula and Caffeine Chemical Name.

Ans: Caffeine formula is C8H10N4O2. And the chemical name of the caffeine is 1, 3, 7-Trimethylpurine-2,6-dione.