alpha-ionone

CAS Number
127-41-3
EC Number
204-841-6
FEMA Number
FEMA 2594

What is alpha-ionone?

Alpha-ionone (CAS 127-41-3) is a synthetic aroma chemical with a violet, woody, and orris-like scent profile. FEMA 2594.

Where is alpha-ionone used?

  • Fragrance and flavor manufacturing: key building block for fine perfumery and food flavoring systems
  • Fine fragrance and personal care: soft violet and floral character in perfumes, body lotions, and hair care products
  • Blends with rose, iris, and musky bases for sophisticated olfactory profiles
  • Food and beverage: FEMA-approved flavoring agent imparting berry, raspberry, and woody nuances in confectionery, baked goods, and beverages
  • Functional flavor systems: supports construction of complex top and heart notes where natural orris or violet extracts would be cost-prohibitive
  • Printing and packaging: scent stability in scented inks and encapsulated fragrance coatings for consumer packaging
  • It is a clear to pale yellow liquid.

Good to know: Flavor-grade and fragrance-grade specifications exist; FEMA 2594 status confirms suitability for food and beverage use across global markets.

Commercial specifications

  • Standard packaging ranges from small drums to bulk quantities depending on application volume requirements.

Other Names (Synonyms)

alpha-(E)-ionone|(E)-alpha-Ionone|(E)-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one|(3E)-4-(2,6,6-Trimethyl-2-cyclohexen-1-yl)-3-buten-2-on|trans-alpha-Ionone|alpha-cyclocitrylideneacetone|alpha-Ionon|(3E)-4-(2,6,6-trimethylcyclohex-2-en-1-yl)but-3-en-2-one

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What are the physical properties of alpha-ionone?

Melting Point <25 °C
Boiling Point 124-126 °C @ Press: 10 Torr
Density 0.92 g/cm³ @ Temp: 30 °C
Flash Point 230 °F
Appearance clear yellow liquid
Color Clear Colourless
Odor at 10.00 % in dipropylene glycol. sweet woody floral violet orris tropical fruity
Form Oil
Water Solubility insoluble
Vapor Pressure 0.133Pa
Refractive Index n 20/D 1.498(lit.)
Log P 3.85 at 37℃

How is alpha-ionone classified and handled safely? Learn More

Warning
GHS07· Irritant GHS08· Health Hazard

Hazard Statements

H315 Causes skin irritation
H317 May cause an allergic skin reaction
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled

Precautionary Statements

P233 Keep container tightly closed.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.

Which trade and regulatory codes apply to alpha-ionone?

HS Code 29142300
WGK (Germany) 2
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