Epicatechin
The smallest and mildest tea catechin, present in cocoa and apples as well, and the other half of a simple theaflavin.
What a drinker notices
- Bitterness — a taste
Mildly bitter and barely drying. On its own it would be close to unremarkable, and in a green tea it is background rather than character.
What this gets credited for, wrongly
Tea's kinship with cocoa is sometimes drawn from shared aroma. The genuine shared chemistry is this compound and theobromine, neither of which is what the cocoa descriptor is describing.
What it is
Epicatechin is the plainest member of the group: no gallate group, no extra hydroxyl, and correspondingly the least drying and least bitter. It is present in a great many plants — cocoa, apples, grapes — so it is the one tea catechin a drinker has certainly met elsewhere. Its interest here is structural. Oxidation pairs a catechin-type unit with a gallocatechin-type unit to make a theaflavin, and epicatechin is the simplest catechin-type unit available, so a leaf's EC share is part of what decides the theaflavin mix and therefore the briskness of the black tea it becomes.
Chemically: Non-galloylated flavan-3-ol — the simplest of the tea catechins.
Where it occurs in the plant
A minor but consistent share of the catechin pool, present through the shoot and less variable between cultivars than the gallated catechins.
What processing does to it
In tea, processing is not a modifier applied to a fixed composition — it is what decides the composition. These are the steps that move this compound, and each links to the step itself.
- Oxidation — Turns it into something else
- Pairs with EGC to form the simplest theaflavin, and with EGCG to form a monogallated one. The four theaflavins of a black tea are the four ways these pairings can happen.
How brewing brings it out
Extraction rate: Moderate
Readily soluble and only moderately temperature-dependent, so it is present in almost any brew including a cold one.
Across infusions: Comes out steadily rather than early or late, which makes it one of the few things about a long session that does not change much.
Water: The least affected of the four principal catechins by water hardness, having neither the gallate group nor the extra hydroxyl that make its relatives bind and precipitate.
Leaf, ratio and agitation: Present in smaller amounts than its galloylated relatives and contributing correspondingly less. It is not a compound anybody adjusts their brewing for.
What you can change
- Moves with the non-gallated catechins; no lever isolates it
Teas this compound defines
Read next
- EGC (epigallocatechin) — The catechin without a gallate group — bitter more than drying, and the partner EGCG needs to make a theaflavin.
- Catechins — The largest soluble fraction of a green tea leaf, the source of astringency, and the compounds oxidation turns into everything a black tea is.
- Theaflavins — The bright orange-red pigments oxidation builds from catechins, and the compounds the tea trade means by briskness.
What this page does not say
This record describes a compound in the leaf and its part in oxidation. It says nothing about it in a body, in tea or in any of the other foods that contain it.
Sources
- TeaHQ editorial synthesis — TeaHQ
This page is TeaHQ’s own synthesis of well-established tea chemistry. No external technical document stands behind it, and that constraint is why there are almost no numbers here: directions, rankings and mechanisms are stated plainly, quantities are not, because a figure nobody can check would look more authoritative than it deserves.