Nonanal

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vivo (non-LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1963-09-30 to 1964-02-14

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

The study meets generally accepted scientific standards with acceptable restrictions for the standard test.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1964

Report date:

1964

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: Draize AH (1959). Appraisal of the safety of chemicals in food, drugs and cosmetics, The Association of Food and Drug Officials of the United States, p52

GLP compliance:

no

Remarks:

study predates GLP

Type of study:

other: Human repeat insult patch test (HRIPT)

Justification for non-LLNA method:

LLNA not available at time of testing

Test material

Test material information

Constituent 1

Reference substance name:

Decanal

EC Number:

203-957-4

EC Name:

Decanal

Cas Number:

112-31-2

Molecular formula:

C10H20O

IUPAC Name:

Decanal

Constituent 2

Reference substance name:

Aldehyde C10 decylic

IUPAC Name:

Aldehyde C10 decylic

Details on test material:

- Name of test material (as cited in study report): Sample SC-1431-A
- Substance type: Odorous liquid
- Molecular formula: C₁₀H₂₀O
- Molecular weight: 156.272
- Smiles notation: O=CCCCCCCCCC
- InChl: InChI=1S/C10H20O/c1-2-3-4-5-6-7-8-9-10-11/h10H,2-9H2,1H3
- Structural formula attached as image file.
- Physical state: Liquid
- Analytical purity: No data
- Impurities (identity and concentrations): No data
- Composition of test material, percentage of components: No data
- Isomers composition: No data
- Purity test date: No data
- Lot/batch No: No data
- Expiration date of the lot/batch: No data
- Stability under test conditions: No data
- Storage condition of test material: No data

In vivo test system

Test animals

Species:

human

Sex:

male/female

Details on test animals and environmental conditions:

SUBJECTS
- Age and sex distribution:
-- Male 16-20 yrs: 1
-- Male 31-40 yrs: 2
-- Male 41-50 yrs: 6
-- Female 21-30 yrs: 1
-- Female 31-40 yrs: 10
-- Female 41-50 yrs: 16
-- Female 51-60 yrs: 1

Study design: in vivo (non-LLNA)

Induction

Induction 1

Route:

epicutaneous, semiocclusive

Vehicle:

other: Ethanol

Induction 2

Concentration / amount:

5 %

Challenge

Challenge 1

Route:

epicutaneous, semiocclusive

Vehicle:

other: Ethanol

Challenge 2

Concentration / amount:

5 %

No. of animals per dose:

43 subjects started programme, 37 completed.

Details on study design:

INDUCTION APPLICATIONS
- Test patch was a 1 in square patch of Webril (absorbent non-woven cotton fabric) affixed to the centre of a 1 × 3 in strip of adhesive elastic bandage material.
- Immediately before application to the subject, 0.5 mL of sample was added to the Webril swatch and the bandage was then placed on the subject's upper arm.
- 6 to 9 different samples were tested simultaneously on each group of subjects, and the order of application rotated from one subject to the next.
- The subjects removed the test bandages after 24 hrs.
- Series of 9 × 24 hr exposures on a Mon-Wed-Fri sequence for 3 wks.
- The reaction to each exposure scored at the following session. Reaction to the 9th exposure on Mon of wk 4.
- Test patch applied to same site each time, except if reaction to sample or adhesive tape rendered this inadvisable, in which case the test patch was omitted or applied to a fresh site.

- Deviations: Closed patches were applied to subject #77 for the first 3 applications, and subjects #103 and #112 for the first two. Thereafter, regular semi-open patches were used.

CHALLENGE APPLICATION
- On Mon of wk 6 a challenge patch was applied to a site not previously exposed and removed after 24 hrs.
- Reactions to the challenge were scored on Wed and Fri of wk 6.
- (Minor departures from the schedule were necessary).

PRELIMINARY TEST
- Initially 10 subjects started on each sample.
- If no untoward effects were observed upon completion of these, approx. 30 subjects were added to the test group.
- Occasionally subjects failed to complete the test for reasons irrelevant to the purpose of the study. In all cases subjects exhibited no significant differences in reactions from other subjects in the group during the time that they were under observation.

SCORING SYSTEM
- Subjects scored on scale of 1-6 as follows:
-- 0: No evidence of irritation
-- 1: Slight erythema
-- 2: Marked erythema
-- 3: Erythema and papules
-- E: Erythema and oedema
-- 4: Very strong oedema and/or papules
-- 5: Vascular eruption
-- 6: Grade E or stronger reaction extending well beyond area of contact.

Positive control substance(s):

no

Results and discussion

In vivo (non-LLNA)

Results

Results 1

Reading:

1st reading

Hours after challenge:

48

Group:

test chemical

No. with + reactions:

0

Total no. in group:

37

Clinical observations:

Little or no primary irritation was caused by the test sample.

Remarks on result:

other: Reading: 1st reading. . Hours after challenge: 48.0. Group: test group. No with. + reactions: 0.0. Total no. in groups: 37.0. Clinical observations: Little or no primary irritation was caused by the test sample..

Results 2

Reading:

2nd reading

Hours after challenge:

96

Group:

test chemical

No. with + reactions:

0

Total no. in group:

37

Clinical observations:

Little or no primary irritation was caused by the test sample.

Remarks on result:

other: Reading: 2nd reading. . Hours after challenge: 96.0. Group: test group. No with. + reactions: 0.0. Total no. in groups: 37.0. Clinical observations: Little or no primary irritation was caused by the test sample..

Any other information on results incl. tables

None of the 37 subjects was sensitised by the sample.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The test substance was assessed for sensitisation over a 48 hour period. None of the subjects tested were sensitized during the test. Therefore the test substance is not classed as sensitising.