Methylated catechins
A small family of catechin variants that a handful of Japanese cultivars carry unusually — and the clearest case on this site of a compound famous for a reason TeaHQ will not discuss.
What a drinker notices
- Astringency — a tactile sensation
Drying, in the way their unmethylated parents are. A tea carrying them tastes like a fairly brisk green tea and nothing about the cup announces them.
What this gets credited for, wrongly
Teas sold on this family are often described as tasting distinctive because of it. What makes those teas taste distinctive is the cultivar as a whole — its total catechin load, its amino acid level, its aroma profile — not the methyl group.
What it is
Most tea plants carry only traces of methylated catechins. A few Japanese cultivars carry a great deal more, and one of them was selected and released substantially because of it. In the cup they behave much as their unmethylated parents do — they are galloylated catechins and they dry the mouth — and no taster identifies them by taste alone. Their significance is agronomic and commercial rather than sensory: they are a cultivar marker, they survive processing, and a tea sold on them is being sold on a laboratory figure rather than on anything a drinker can verify at the table.
Chemically: Flavan-3-ols carrying an added methyl group — chiefly methylated forms of EGCG.
Where it occurs in the plant
Present at trace level in most Camellia sinensis and at substantially higher level in a small number of Japanese registered cultivars. The trait is varietal rather than agricultural — shading and fertilisation do not create it.
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.
- Kill-green (fixation) — Locks it in place
- Fixation preserves them as it preserves the other catechins, which is why the cultivars carrying them are made as green tea. Full oxidation consumes them along with everything else in the group.
How brewing brings it out
Extraction rate: Slow — needs heat and time
Extracts like the galloylated catechins it belongs with: slowly, and much more readily in hot water than cool. A low-temperature brew of such a tea leaves a large share of the group in the leaf.
Across infusions: Track the catechins they are derived from, arriving with the middle of a session rather than the opening of it.
Water: Behave as their unmethylated parents do in water. What distinguishes them is where they occur — a handful of cultivars — rather than how they extract.
Leaf, ratio and agitation: Cultivar decides whether they are present at all. No brewing choice creates them, and a tea made from a cultivar without them cannot be brewed into having any.
What you can change
- Moves with the galloylated catechins — hotter and longer extracts more
- No brewing decision distinguishes them from ordinary catechins by taste
Where this gets misdescribed
That a cultivar bred for a compound is a better tea. It is a tea with more of one measured thing in it, which is a different statement, and on this site the second is the only one that can be checked.
Cultivars notable for it
Read next
- EGCG (epigallocatechin gallate) — The most abundant catechin in green tea, and the clearest single demonstration that astringency and bitterness are different things.
- 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.
What this page does not say
There is one reason this family is famous, and it is a claim about a body rather than about a cup. This record does not make that claim, repeat it, hedge it or deny it. Declining is deliberate: the claim belongs to TeaHQ's held health surface, and a chemistry page is exactly where it would otherwise arrive without anybody deciding to publish 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.