Ingredient Dictionary

METHYLUNDECANAL

2-methyl-Undecanal is a saturated fatty aldehyde and a 2-methyl-branched fatty aldehyde.

Definition

2-methyl-Undecanal is a saturated fatty aldehyde and a 2-methyl-branched fatty aldehyde.

Source: PubChem

US FDA substance register · UNII S94QNS2VY5 · registered name 2-METHYLUNDECANAL · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Gives the product a scentPERFUMING

Safety & regulatory references

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

More data — names, identifiers, properties, test records, literature

Names & identifiers

METHYLUNDECANALINCIUndecanal, 2-methyl-Synonym

CAS No.chemical registry number: 110-41-8
EC No.EU chemical inventory number: 203-765-0
DTXSIDUS EPA chemical ID: DTXSID9047629
DTXCIDUS EPA compound ID: DTXCID7027629

IUPAC: 2-Methylundecanal
Molecular formula: C12H24O
Molecular weight: 184.323 g/mol

Measured properties

Appearance: liquid
Initial boiling point and range: 171 ℃(at 760 mmHg)
Flash point: 93 ℃
Relative density: .8300 g/cm3
n-Octanol/water partition coefficient (Kow): 4.67 (est.)
Molecular weight: 184.32

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: KOSHA safety data sheets (Korea)

What products actually use it for

What the 145 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

Fragrance143
Flavouring and nutrient2

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

2 skin studies and 1 eye studies are on record.

Classed as highly irritating1Classed as moderate1

The studies disagree (the most common conclusion covers 50%), so they do not establish that this ingredient is irritating. These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 3 studies

High Frequency of Sensitization
skin sensitisation: in vivo (LLNA) · Screening · equivalent or similar to OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay) (based on draft test guideline)
Moderate or Mild Irritation
skin irritation: in vivo · Screening · other guideline: Morikawa F, Nakayama Y, Fukuda M, Hamano M, Yokoyama Y, Nagura T, Ishihara M, Toda K (1974). Techniques for evaluation of phototoxicity and photoallergy in laboratory animals and man. Sunlight and Man, University of Tokyo Press, Tokyo, Japan. pp 529-557 equivalent or similar to
Studies Indicate No Significant Irritation
eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) according to