Jasmine lactone
A creamy, peach-and-jasmine note that arrives in tea both from scenting with real flowers and from the leaf's own chemistry.
What a drinker notices
- Aroma — an aroma
Creamy floral with a stone-fruit edge — peach and apricot alongside the jasmine. Softer and rounder than the sharp floral of the monoterpenes.
What this gets credited for, wrongly
Any creamy floral quality in an oolong is often assumed to mean the tea has been scented or flavoured. Sometimes it does. Often it is the leaf's own chemistry, and the two are distinguishable by whether a flower ever touched the leaf, not by the note itself.
What it is
Jasmine lactone is one of the compounds that makes jasmine smell like jasmine, and it has a soft, creamy, peach-like quality alongside the floral. It reaches tea by two routes, and telling them apart matters commercially. In jasmine tea it is transferred from living flowers during scenting, over repeated nights of the flowers opening against the leaf. In some oolongs it is the plant's own, developed during bruising and oxidation, which is why a good Dan Cong or a well-made Tie Guan Yin can smell floral in a way that has nothing to do with added flowers.
Chemically: Lactone — a cyclic ester, one of the defining volatiles of jasmine flowers.
Where it occurs in the plant
Present at low level in tea leaf and developed during processing; present abundantly in Jasminum sambac flowers, which is the basis of scenting.
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.
- Scenting — Raises it
- Transferred from living jasmine flowers laid against dried tea over repeated nights. The flowers must be alive and opening; dried flowers give almost nothing, which is why the good product is made in a narrow season.
- Flower removal and the finishing round (qi hua, ti hua) — Leaves it broadly alone
- The spent flowers are sifted out and the aroma stays behind. A jasmine tea sold with flowers still in it is generally displaying them rather than relying on them.
- Bruising (shaking) — Raises it
- Developed by the leaf itself during oolong bruise-and-rest, which is the route that owes nothing to flowers.
- Applied flavouring — Leaves it broadly alone
- Metering a flavouring preparation onto finished dry tea adds nothing to the leaf's own aroma chemistry, and that is the entire distinction between a scented tea and a flavoured one. A flavoured jasmine tea's fragrance is not this compound arriving from a flower over several nights; it is a preparation applied in an afternoon. Both can smell good and only one is what the name has historically meant, which is why the two are worth being able to tell apart on a shelf.
How brewing brings it out
Extraction rate: Moderate
Moderately volatile and reasonably water-soluble, so it stays in the cup better than the monoterpenes do and survives into a cooled liquor.
Across infusions: Persists past the first infusion, which is why a well-scented jasmine tea is worth brewing more than once and a lightly flavoured one is not.
Leaf, ratio and agitation: Holds up better than the free terpenoids across a long steep because it is not lost to the steam in the same way, so it survives western brewing where more delicate florals do not.
What you can change
- Brew a second and third infusion to judge whether the aroma is scented or added
- Assess the cooled cup, where it persists
Where this gets misdescribed
That jasmine tea is tea with dried jasmine flowers in it. Proper scenting uses living flowers that are then removed; the flowers visible in a cheap jasmine tea are usually decoration on a tea that was flavoured another way.
Teas this compound defines
Read next
- Indole — Jasmine at trace level and something much worse above it — the clearest demonstration in tea that dose decides identity.
- Linalool — A major floral aroma compound of tea, largely stored bound to sugar in the leaf and set free by processing.
- Linalool oxides — What linalool becomes when the leaf is oxidised — sweeter, creamier and less sharply floral, and a marker of how far a tea has gone.
What this page does not say
This record describes an aroma compound and how it reaches the cup. 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.