Compound
Ethyl decanoate
The longest of the common medium-chain esters, contributing waxy and faintly floral weight rather than obvious fruit, and prone to dropping out of solution in the cold.
Also called Ethyl caprate.
- Class
- Esters
- Formula
- C12H24O2
- How often it matters
- Specialist — met in particular circumstances
What it does in cider
- Forms from decanoyl-CoA during fermentation, at concentrations that depend on the yeast strain more than on temperature.
- Contributes waxy, oily and faintly floral character rather than recognisable fruit.
- Has poor solubility, so it can precipitate or form a slight haze in a cider chilled hard.
- Adds textural weight disproportionate to its aromatic contribution.
How it is perceived
What the compound registers as, and at roughly what concentration. Perception is not a property of the molecule alone: sugar, tannin and carbonation all change where a threshold falls.
- waxy
- oily
- faint floral
- soapy
A higher threshold than the shorter esters of its family, so it is a background contributor in most ciders rather than an identifiable note.
Descriptors it is responsible for
Sensory records that name Ethyl decanoate as a cause. Each states the perception and the mechanism behind it.
- Beeswax — A dry, waxy, faintly sweet note from long-chain fatty acids and their esters, associated with lees contact.
- Peach — A soft, sweet stone-fruit aroma produced by γ- and δ-lactones formed during fermentation and maturation.
- Plum — Dark, soft stone-fruit weight from heavier ethyl esters combined with polymerised phenolics in matured cider.
The structure it moves
| Dimension | What it is |
|---|---|
| Body | How much weight and viscosity the drink has in the mouth. |
| Fermentation character | Aromas made by the ferment rather than carried in from the fruit. |
What forms it
Processes that put this compound into the drink, or increase how much of it is there.
Wild fermentation
Letting the microflora already present on the fruit and in the press house carry the ferment, in a succession rather than as a single organism.
Inoculated fermentation
Starting a ferment by pitching a chosen yeast culture so that one known strain, rather than the fruit’s resident population, does the work.
What removes or limits it
Processes that reduce it, hold it below a threshold, or stop it forming in the first place.
Organisms that produce it
Which organism is responsible usually decides whether the compound is a feature or a symptom.
About Ethyl decanoate
Ethyl decanoate completes the medium-chain ester series and contributes least in aroma terms. Its long hydrocarbon tail makes it poorly soluble in a dilute alcohol solution, so a cider carrying much of it can throw a faint haze or a light deposit when chilled sharply — one of the several things a cold-stabilisation step removes along with tartrate and protein.
What it adds is weight rather than smell: a waxy, slightly oily quality that fills out the mid-palate. In a thin cider that is welcome; in a cider already carrying its longer relatives it pushes towards soapiness.
It is recorded here mostly for completeness, because the family is easier to understand as a series than as three separate compounds, and because a cider judged as soapy is usually being judged on the top of this series rather than on any single molecule.
Related compounds
Compounds it is formed from, converted into, confused with, or routinely met alongside.
Esters
Ethyl octanoate
A medium-chain ethyl ester contributing ripe pear and a waxy sweetness, and one of the compounds that makes an ester-forward cider feel rounder as well as fruitier.
Esters
Ethyl hexanoate
One of the most powerfully aromatic esters in cider, perceptible at a few micrograms per litre, contributing green apple and aniseed to the fruit complex.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- Which yeast ferments cider — Saccharomyces cerevisiae finishes almost every cider fermentation, whether it was pitched or arrived from the press house. In a spontaneous ferment it is not the first organism present, only the one that survives the alcohol it makes.
- How does cider ferment — Yeast consumes the sugar in apple juice and produces roughly equal masses of ethanol and carbon dioxide, along with the esters and higher alcohols that give cider much of its aroma. In a wild ferment several yeast species take turns before *Saccharomyces* finishes the job.
- Can you make cider from shop bought apple juice — Yes, provided the juice contains no preservative — check for potassium sorbate or benzoate on the label. Pasteurised juice ferments perfectly well once yeast is added, because pasteurisation removes the organisms but not the sugar.
- Do i need a filter to make cider
- What is cold stabilisation in cider
Where to go next
- All compounds — Grouped by what the fruit brings and what the ferment makes of it.
- Sensory — Every descriptor, with the compound or process that causes it.
- Microbiology — The organisms whose metabolism most of this chemistry belongs to.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
The Science of Cidermaking and associated technical writing
Andrew Lea · reference work · passage verified 2026-08-24
Written by a food chemist who worked at Long Ashton on apple phenolics. Unusual among specialist cider writing in that it is primary-research-adjacent: the author is describing work he did, and cites the literature. This is why it is registered at tier 1 for chemistry while a general cider book is not.