Isononanoic acid, C16-18 (even numbered)-alkyl esters

Direct observations: clinical cases, poisoning incidents and other

Administrative data

Endpoint:

direct observations: clinical cases, poisoning incidents and other

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

disregarded due to major methodological deficiencies

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: Documentation is insufficient for assessment. Few details on the study protocol are given.

Data source

Reference

Reference Type:

publication

Title:

Allergic contact dermatitis from cetearyl isononanoate

Author:

Le Coz C.J. and Bressieux A.

Bibliographic source:

Contact Dermatitis, 2003; 48:343

Materials and methods

Study type:

clinical case study

Endpoint addressed:

other: allergic contact dermatitis

Principles of method if other than guideline:

A woman with a history of allergic contact dermatitis reacted to a moisturising cream. Patch testing was performed using the ingredients in the cream and other known allergens, and repeated open application test (ROAT) was performed with the cream and test substance.

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Hexadecyl isononanoate

EC Number:

284-424-3

EC Name:

Hexadecyl isononanoate

Cas Number:

84878-33-1

Molecular formula:

C25 H50 O2

IUPAC Name:

hexadecyl 7-methyloctanoate

Details on test material:

- Name of test material (as cited in study report): cetearyl isononanoate, hexadecyl isononanoate
- Analytical purity: no data

Method

Type of population:

other: case report

Ethical approval:

not applicable

Route of exposure:

dermal

Reason of exposure:

accidental

Exposure assessment:

not specified

Details on exposure:

A 23-year old woman with a history of allergic contact dermatitis from medical adhesive tape, toilet waters and fantasy jewellery, presented with acute dermatitis on her lower limbs within 2 days of applying a urea-based moisturising cream. Patch testing was performed according to Lachapelle et al. (Contact Dermatitis 1997; 36:121-123) with the revised international series, other allergens and the cream. Readings on Day 2/4 showed positive reactions to colophonium (-/++), fragrance mix (-/++) and nickel sulfate (-/+) that previously caused reaction and the urea cream (+/++) causing current reaction. A repeated open application test (ROAT) performed with the cream elicited follicular itching dermatitis within 2 days. Patch tests were performed with all the ingredients of the cream, with positive reactions to the cream (++/++) and cetearyl isononanoate diluted to 4% in liquid mineral oil (-/++). 2% cetyl alcohol in liquid mineral oil was negative. A ROAT performed with the 4% cetearyl isononanoate solution applied 2 times/day on the forearm gave a positive reaction (++) after 2 days. 10 voluntary controls tested with 4% cetearyl isononanoate in liquid mineral oil had negative reactions on Day 2/3 and Day 4.

Results and discussion

Outcome of incidence:

The woman tested positive to a patch test and repeated open application test (ROAT) with cetearyl isononanoate diluted to 4% in liquid mineral oil.