Nerolidol
A woody-floral aroma compound that rises when the leaf is stressed — by bruising, and famously by insects.
What a drinker notices
- Aroma — an aroma
Woody and floral together, with an apple or apple-skin quality that reads as depth rather than as a top note. It sits under the lighter terpenoids and lasts longer in the cup than they do.
What this gets credited for, wrongly
The honey note of Oriental Beauty is credited to the leafhopper as though the insect deposited something. The insect deposits nothing; it damages the leaf, and the plant's own response produces the aroma.
What it is
Nerolidol is heavier and less volatile than linalool, and it smells woody and floral at once, with an apple-skin quality. What makes it interesting is that the plant makes more of it under attack. Leaf damaged by the tea green leafhopper responds by raising its defensive volatiles, and nerolidol is prominent among them — which is the compositional basis of Oriental Beauty and of the honey character of bug-bitten teas generally. Repeated bruising during oolong manufacture provokes something related by mechanical means, which is one way of describing what oolong processing is for.
Chemically: Sesquiterpene alcohol — a heavier terpenoid than linalool or geraniol.
Where it occurs in the plant
Low in undisturbed leaf and rising sharply in response to damage, whether from insects, from bruising or from a long wither. It is a stress compound rather than a stored one.
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.
- Bruising (shaking) — Raises it
- Mechanical damage provokes the same class of response that insect damage does, which is a fair description of why oolong is bruised repeatedly rather than rolled once.
- Withering — Raises it
- A long wither raises it steadily. Heavier terpenoids build over hours where the light ones appear early.
- Oxidation — Raises it
- Persists and accumulates through partial oxidation, which is why heavily oxidised oolongs carry it more than lightly oxidised ones.
How brewing brings it out
Extraction rate: Moderate
Less volatile than the monoterpenes, so it survives longer in a hot cup and shows up more in the second and third infusions than in the first.
Across infusions: Sustained. It is one of the compounds behind an oolong session deepening rather than simply weakening as it goes.
Water: Barely water-soluble. What reaches a drinker arrives in the headspace above the cup rather than dissolved in it, which is why warming an empty vessel and smelling the lid is a real technique rather than a ritual.
What you can change
- Brew hot and continue past the first infusion
- Smell the cooled empty cup, where heavier aroma persists
Teas this compound defines
Read next
- Linalool — A major floral aroma compound of tea, largely stored bound to sugar in the leaf and set free by processing.
- Geraniol — A principal source of rose character in tea, and half of the clearest compositional difference between China-type and Assam-type plants.
- Theasinensins — The dimers formed when two catechins of the same type couple — the oxidation route oolong takes and black tea largely does not.
What this page does not say
This record describes an aroma compound and the leaf damage that raises it. It makes no statement about what it does in a body.
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.