Material guide: ethyl vanillin — everyone says it is three times stronger than vanillin, and the database cannot tell them apart

"Ethyl vanillin is three times stronger than vanillin" is one of the most widely repeated numbers in perfumery.

I went looking for that three in the database. Here is what came back:

	Vanillin	Ethyl vanillin
Strength field	Medium, evaluate at 10% or less	Medium, evaluate at 10% or less
Blotter hours	400	400
Vapour pressure	0.002 mmHg	0.001 mmHg
Suppliers	193	76

The strength field says the same sentence about both. That field does not resolve them.

The short version

• The database cannot separate these two, so the "three times" figure does not come from there, and this article will not repeat it.
• The one measured trace supporting "stronger" is dose: across the 953-formula corpus, ethyl vanillin's median is 0.50% against vanillin's 1.00%. Formula authors spend it more sparingly.
• It is not found in nature. Vanillin occurs in the vanilla pod; this does not.
• Two 2026 studies put the pair side by side. Against Aspergillus it did not come out on top, and against pepsin the two are nearly tied. The ethyl group that makes it smell stronger does not make it more biologically active.

The basics

CAS	121-32-4
Chemical name	4-hydroxy-3-ethoxybenzaldehyde
Formula	C₉H₁₀O₃
Molecular weight	166.18
Type	Synthetic single molecule
Odour	Sweet, creamy, vanilla, caramellic, root beer
Odour family	vanilla
Strength	Medium (evaluate at 10% or below)
Longevity	400 hours @ 20% in DPG (not a neat value)
Appearance	White to off-white powder
Boiling point	285–294 °C @ 760 mmHg
Flash point	145 °C
Vapour pressure	0.001 mmHg @ 25 °C (est)
logP	1.60 (est)
Natural occurrence	Not found in nature
Storage	24 months or longer; cool, dry, sealed, away from heat and light
Regulatory	FEMA 2464, JECFA, CoE, FLAVIS
Suppliers	76
Corpus rank	32nd (80 of 953 formulas, 8.4%, median dose 0.50%, appearing as a pre-dilution in 26%)

What one ethyl group changes

Vanillin is 4-hydroxy-3-methoxybenzaldehyde; ethyl vanillin is 4-hydroxy-3-ethoxybenzaldehyde. The only difference is whether that oxygen carries a methyl or an ethyl.

The difference in smell is real: ethyl vanillin is sweeter and creamier, closer to what most people picture as vanilla ice cream, while vanillin is drier and woodier, closer to an actual vanilla pod. The root beer descriptor attaches only to ethyl vanillin.

Note though that it is not found in nature. The vanilla pod contains vanillin, not ethyl vanillin. So a "vanilla" built with it smells more like the popular memory of vanilla than real vanilla does — that reference point was constructed by the food industry rather than by a plant.

How to read the "three times"

I found no citable strength measurement, so I will not print a multiple. There is one indirect piece of evidence.

From the formula corpus:

	Formulas	Median dose
Vanillin	137	1.00%
Ethyl vanillin	80	0.50%

A factor of two, pointing the same way as the folklore. This is the collective behaviour of formula authors rather than a sensory measurement, so it supports "the industry spends it more sparingly" and not "it is twice as strong".

Incidentally this also illustrates the purchasing logic from the previous article: a 0.50% dose means one 10 g bottle makes 20 batches of 100 g concentrate. It is a one-off investment rather than a running cost.

The 26% pre-dilution share fits too — this is a material you make into a stock.

Two studies that put it beside vanillin

First, antifungal. Flores Maldonado and colleagues, in the Canadian Journal of Microbiology in 2026, tested vanillin, o-vanillin, ethyl vanillin and vanillin acetate against Aspergillus fumigatus, which the World Health Organization lists as a critical-priority fungal pathogen because of resistant strains and high mortality.

Broth microdilution gave minimum inhibitory concentrations of 0.25 to 1 mM, with o-vanillin the most active at 0.25 mM. At subinhibitory concentrations, vanillin, o-vanillin and vanillin acetate reduced conidial adhesion and biofilm formation. The compounds decreased ergosterol concentration, and in silico analysis showed interaction with ERG5, ERG6 and ERG11. In an in vivo aspergillosis model, vanillin and o-vanillin demonstrated therapeutic efficacy.

Watch the lists. Ethyl vanillin is not among the three that reduced adhesion and biofilm, nor among the two effective in vivo. It was tested, and it was not the standout.

Second, binding to a digestive enzyme. Gao and colleagues, in Spectrochimica Acta Part A in 2026, compared vanillin, ethylvanillin and veratraldehyde — three benzaldehyde-family flavorants — for their interaction with pepsin, using molecular docking, molecular dynamics, multi-spectroscopic techniques, and enzyme activity and antioxidant assays.

Docking put all three in the catalytic cleft near Asp32 and Asp215 with comparable binding energies, with ethyl vanillin slightly more favourable. Thermodynamic analysis showed vanillin's binding driven mainly by electrostatic interactions, while ethyl vanillin and veratraldehyde were governed by hydrogen bonds and van der Waals forces. All three formed stable complexes via static quenching, with binding constants from 10⁴ to 10⁵ M⁻¹. CD and FT-IR showed ligand-induced conformational rearrangement, with β-sheet content rising 12.8% on vanillin binding.

Enzyme assays showed concentration-dependent inhibition: vanillin 28.79%, ethyl vanillin 28.13%, with veratraldehyde negligible.

Essentially tied. That ethyl group changed what drives the binding — from electrostatics to hydrogen bonding and van der Waals — without changing the magnitude of the inhibition.

Both studies are in vitro and model work, supporting no health claim. They are here for the comparison itself: the same molecular skeleton plus one ethyl group changes the smell noticeably and leaves the biological activity where it was. Odour strength and biological activity are not the same axis.

Discount that 400 hours

The database records "400 hours @ 20% in DPG".

As with musk ketone, that is not a neat value but a diluted measurement. 400 hours is the ceiling of the source scale, where 13.3% of materials pile up, and a material that passes 400 hours at 20% dilution looks identical in a numeric column to one recorded at 400 hours neat.

What you actually notice is that it lasts a very long time, and stays sweet the whole way.

When you smell it

• It is a powder. For handling solids see the cinnamic alcohol article: make a 10% stock first.
• Put it beside vanillin at the same dilution. This is the comparison most worth running. Ethyl vanillin reads sweeter and creamier, vanillin drier and woodier.
• Start at 0.5%. That is the corpus median, and it will push a whole formula toward dessert very readily.
• Notice the root beer. At some concentrations it produces a distinct root beer character, which is its own and not vanillin's.

Buying and storage

Seventy-six suppliers, fewer than vanillin's 193 but still easy. On naming, keep it distinct from o-vanillin and vanillin acetate, which are different materials. CAS 121-32-4.

A 0.5% dose means a small pack lasts a long time. The 145 °C flash point removes fire concerns from storage, and shelf life is 24 months or longer.

Regulatory and safety

Six GHS statements: H302 harmful if swallowed, H315 causes skin irritation, H319 causes serious eye irritation, H335 may cause respiratory irritation, H402 harmful to aquatic life, H412 harmful to aquatic life with long lasting effects.

Acute toxicity: gavage rat LD50 3,500 to 4,470 mg/kg, dermal rabbit LD50 above 7,940 mg/kg.

Flavour listings are comprehensive (FEMA 2464, JECFA, CoE, FLAVIS). For use limits, check current IFRA Standards — here is how.

→ Ethyl vanillin in the database: full physical data, 76 suppliers and suggested blends. → Search by odour: try "vanilla sweet caramellic".

References

O. E. Flores Maldonado et al., Vanillin derivatives as antifungal agents against Aspergillus fumigatus: in vitro activity, in vivo efficacy, and mechanistic insights, Canadian Journal of Microbiology (2026). PMID 42617182. doi:10.1139/cjm-2025-0295

Y. Gao et al., Comparative binding and functional behavior of three benzaldehyde-based food flavorants with pepsin, Spectrochimica Acta Part A, 363(Pt 1), 128479 (2026). PMID 42501437. doi:10.1016/j.saa.2026.128479