Ethyl Maltol
Calorie-free sweetener — but accelerates metal leaching from vape coils.
⚠ Sounds harmless — it isn't
Süßstoff klingt unbedenklich — Ethyl-Maltol bindet aber Metallionen und beschleunigt nachweislich die Auswaschung von Chrom, Nickel und Blei aus Heizdrähten in das Aerosol.
At a glance
- Also known as
- 2-Ethyl-3-hydroxy-4H-pyran-4-on
- CAS number
- 4940-11-8
- Toxicity
Low
- Carcinogenic
- Not classified for cancer
- In cigarette smoke
- In vape aerosol
- Häufig in „süßen“ Liquids als Geschmacks-Verstärker; verstärkt nachweislich Metall-Auswaschung aus Coils
What is Ethyl Maltol?
Ethyl maltol is a sweet flavour compound with a caramel-fruity taste, used industrially as a flavour enhancer in confectionery, beverages and pharmaceuticals. In vape liquids, ethyl maltol is one of the most commonly added sweeteners. Toxicologically unremarkable in food contexts, it has a surprising secondary effect in vape applications.
Why is Ethyl Maltol in cigarettes?
Ethyl maltol binds metal ions — a property known in food chemistry as „chelation“ and used there to stabilise flavours. In vape liquids, this property means ethyl maltol more efficiently transports metals from heating wires (nickel, chromium, lead) into the aerosol. Studies (Reilly et al., 2018) showed that ethyl-maltol-containing liquids have measurably elevated metal concentrations in the aerosol.
What Ethyl Maltol does to your body — short term
Ethyl maltol itself barely irritates the airways acutely — the direct acute effect isn't noticeable in normal vape consumption. What matters here is the amplifier effect: liquids with high ethyl maltol content lead to higher metal exposure per puff, whose acute effects correspond to the respective metals (see chromium, nickel, lead).
What Ethyl Maltol does long term
The long-term effect of ethyl maltol itself in the inhalation context is barely studied. The documented long-term concern is indirect: through its metal-binding property, ethyl maltol increases cumulative heavy-metal exposure over years of consumption. Reilly et al. (2018) and Olmedo et al. (2018) showed that ethyl-maltol-containing liquids significantly enhance metal leaching from coils — the exact magnitude varies strongly across devices, wattages and coil materials.
Where else do you know Ethyl Maltol from?
You know ethyl maltol as a sweet enhancer in lemonades, chewing gum, baked goods and some pharmaceuticals (especially paediatric medications for taste rounding). „Maltol“ is the substance class — ethyl maltol is the somewhat sweeter variant of its sibling maltol.
How it compares
There's no separate workplace exposure limit for ethyl maltol (food additive). The toxicologically relevant magnitude isn't the substance itself but the increased metal exposure from coils it enables — against which metal limits apply (see chromium, nickel).
Workplace exposure limit: kein eigener Grenzwert (Lebensmittelzusatzstoff)
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