A single molecule, two names inherited from the 19th century
In 1820, the German chemist Friedlieb Ferdinand Runge isolated a stimulant substance in the coffee bean and named it caffeine. Seven years later, the researcher Oudry extracted from the leaf of Camellia sinensis a similar-looking substance and named it theine, convinced that he was dealing with a distinct compound. Analysis settled the matter definitively in 1838: theine and caffeine are exactly the same alkaloid molecule, 1,3,7-trimethylxanthine, with the molecular formula C8H10N4O2.
In the human brain, this single molecule binds to adenosine receptors, mainly the A1 and A2a subtypes, and temporarily masks the signals of fatigue and drowsiness. The commercial distinction between the two terms therefore has no biochemical basis.
The plant matrix: why tea awakens without overstimulating
While the molecule is identical, the true physiological difference lies in the matrix that carries it during infusion.
In coffee: free caffeine
Caffeine circulates freely. As soon as it is ingested, it crosses the intestinal barrier within minutes and causes a rapid peak in blood plasma levels, often reached within 30 to 45 minutes. This rise is followed by a sharp metabolic clearance, the well-known energy crash, sometimes accompanied by nervousness or tachycardia.
In tea: captive caffeine
Caffeine is chemically bound to tannins, specifically polyphenols from the catechin subclass such as EGCG, with which it forms non-covalent supramolecular complexes. This bond considerably slows gastrointestinal absorption. The result is no longer an aggressive peak but an energy plateau smoothed over 3 to 6 hours, a clear and sustained alertness, without palpitations. It is the signature of our green teas and our black teas whole-leaf.
L-theanine, the amino acid of calm alertness
Tea’s distinctive calming effect is explained by L-theanine, or N-ethyl-L-glutamine, a non-protein amino acid synthesised by the tea plant. It crosses the blood-brain barrier via LAT1 amino acid transporters.
- It induces the production of alpha brain waves, from 8 to 12 Hz, a physiological marker of deep relaxation and calm alertness close to a meditative state.
- It promotes the release of calming neurotransmitters: GABA, dopamine and serotonin.
- It inhibits the oxidation of EGCG by acting as a natural chelator of the copper ions responsible for its degradation, thereby prolonging the antioxidant bioavailability of the cup.
The available review studies on the combined cognitive effects of caffeine and L-theanine describe precisely this synergy between alertness and calm, found in no other stimulating drink.
Not all teas release the same energy
Theine concentration depends on cultivation methods and the thermokinetic parameters of the infusion. The Matcha leads by a wide margin. Produced from shade-grown leaves using the kabuse method to maximise amino acid production, then ground on a stone mill, it is consumed as a colloidal suspension: all of the theine, or 50 to 70 mg per 2 grams, is absorbed, tempered by record levels of L-theanine.
For gentler attention, a white tea infused at 80 degrees for two minutes provides a very delicate extraction. As caffeine is highly temperature-dependent, less hot water produces a liquor rich in L-theanine with limited caffeine extraction.
One persistent myth remains to be dispelled: rinsing tea in boiling water for 30 seconds does not decaffeinate it. Kinetic studies show that this step removes only 9 to 20 per cent of the caffeine, while irreversibly stripping away the finest aromas and catechins. True control over energy comes through time, temperature, or the practice of short multiple infusions in gongfu cha, with the brewing objects appropriate.
The HOLLIN commitment: the imperative of zero added flavouring
Understanding this biochemical engineering reveals what the industry destroys. Pyramid-shaped plastic tea bags release up to 11,6 billion microplastics per cup under the effect of hot water. The artificial flavourings added to mask the poor quality of tea dust disrupt the vital hydrophobic interactions between EGCG and caffeine.
At HOLLIN, we reject industrial tea bags and artificial flavourings that mask and destroy this natural balance. To truly understand this difference in energy, come and taste our pure teas, without any added flavourings.
Discover our complete collection, our shade-grown Matcha and our traditional tools at the HOLLIN du Goût counter, our contemporary Asian grocery located at 22 avenue de la République, 78500 Sartrouville (Île-de-France).