Octadecanedioic acid, 1,18-dimethyl ester

Endpoint summary

Key value for chemical safety assessment

Effects on fertility

Description of key information

To assess reproductive/development toxicity an experimental result has been read across from a supporting substance, structural analogue 9-decanoic acid, methyl ester (EC 662-772-0):

A short-term repeat dose oral toxicity study combined with a reproduction/ developmental toxicity screening test was performed in the rat in accordance with GLP and OECD Guideline 422 . The test item, 9-decenoic acid, methyl ester was administered by gavage to three groups, each of ten male and ten female Wistar Han™:RccHan™:WIST strain rats, for up to eight weeks (including a two week pre-pairing phase, pairing, gestation and early lactation for females), at dose levels of 30, 300 and 1000 mg/kg bw/day. There were no treatment related effects observed on mating, fertility or gestation length at any dose level. The offspring litter size, sex ratio, viability, growth and development were all comparable to controls and no adverse effects were noted. Since no treatment-related effects were observed for reproduction, a NOEL for reproductive toxicity was considered to be 1000 mg/kg bw/day.

Link to relevant study records

Reference

Endpoint:

screening for reproductive / developmental toxicity

Remarks:

based on test type (migrated information)

Type of information:

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

Adequacy of study:

key study

Study period:

The study was performed between 23 November 2011 and 15 May 2012

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

KL2 due to RA

Justification for type of information:

Read-across justification: A comparison target substance (9DDAME) and the read-across substance (9DAME) shows that the two substances share structural similarities, increasing from a chain length of C10 to C12 with similar functional groups and also have ‘mechanistic action’ similarities.

Reason / purpose for cross-reference:

read-across source

Qualifier:

according to guideline

Guideline:

OECD Guideline 422 (Combined Repeated Dose Toxicity Study with the Reproduction / Developmental Toxicity Screening Test)

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of inspection 2011-06-27 to 2011-07-21; Date of signature 2011-08-15

Species:

rat

Strain:

Wistar

Sex:

male/female

Route of administration:

oral: gavage

Vehicle:

arachis oil

Analytical verification of doses or concentrations:

yes

Duration of treatment / exposure:

Up to eight weeks (including a two week pre-pairing phase, pairing, gestation and early lactation for females).

Frequency of treatment:

Test item was administered daily

Remarks:

Doses / Concentrations:
0, 30, 300 and 1000 mg/kg bw/day. Treatment volume (4 ml/kg) corresponding to concentrations of 7.5, 75 and 250 mg/ml, respectively.
Basis:

No. of animals per sex per dose:

10

Control animals:

yes, concurrent vehicle

Statistics:

Where considered appropriate, quantitative data was subjected to statistical analysis to detect the significance of intergroup differences from control; statistical significance was achieved at a level of p<0.05. Statistical analysis was performed on the following parameters: Grip Strength, Motor Activity, Body Weight, Body Weight Change, Food Consumption during gestation and lactation, Haematology, Blood Chemistry, Absolute Organ Weights, Body Weight- Relative Organ Weights
Data were analysed using the decision tree from the ProvantisTM Tables and Statistics Module
Where appropriate, data transformations were performed using the most suitable method. The homogeneity of variance from mean values was analysed using Bartlett’s test. Intergroup variance were assessed using suitable ANOVA, or if required, ANCOVA with appropriate covariates. Any transformed data were analysed to find the lowest treatment level that showed a significant effect, using the Williams Test for parametric data or the Shirley Test for non-parametric data. If no dose response was found, but the data shows non-homogeneity of means, the data were analysed by a stepwise Dunnett’s (parametric) or Steel (non-parametric) test to determine significant difference from the control group. Where the data were unsuitable for these analyses, pair-wise tests was
performed using the Student t-test (parametric) or the Mann-Whitney U test (nonparametric). Data not analysed by the Provantis data capture system were assessed separately using the SPSS statistical package.

Due to the preponderance of non-normally distributed data, reproductive parameters (implantation losses, offspring sex ratio and offspring surface righting) were analysed using non-parametric analyses.

Probability values (p) were calculated as follows:
p<0.001 ***
p<0.01 **
p<0.05 *
p?0.05 (not significant)

Clinical signs:

no effects observed

Body weight and weight changes:

no effects observed

Food consumption and compound intake (if feeding study):

no effects observed

Organ weight findings including organ / body weight ratios:

no effects observed

Histopathological findings: non-neoplastic:

no effects observed

Other effects:

no effects observed

Reproductive function: oestrous cycle:

not examined

Reproductive function: sperm measures:

not examined

Reproductive performance:

no effects observed

Dose descriptor:

NOAEL

Remarks:

Sytemic toxicity

Effect level:

1 000 mg/kg bw/day

Based on:

test mat.

Sex:

male/female

Basis for effect level:

other: The oral administration of the test substance at dose levels of 30, 300 and 1000 mg/kg mg/day did not result in any toxicologically significant effects.

Dose descriptor:

NOEL

Remarks:

Reproductive toxicity

Effect level:

1 000 mg/kg bw/day

Based on:

test mat.

Sex:

male/female

Basis for effect level:

other: There were no treatment-related effects on mating performance

Critical effects observed:

no

Clinical signs:

no effects observed

Mortality / viability:

no mortality observed

Body weight and weight changes:

no effects observed

Sexual maturation:

not examined

Organ weight findings including organ / body weight ratios:

not examined

Gross pathological findings:

no effects observed

Histopathological findings:

not examined

Developmental immunotoxicity:

no effects observed

Dose descriptor:

NOAEL

Remarks:

Reproductive toxicity

Generation:

F1

Effect level:

ca. 1 000 mg/kg bw/day (nominal)

Based on:

test mat.

Sex:

male/female

Basis for effect level:

other: no treatment related effects on litters when compared to controls

Critical effects observed:

no

Reproductive effects observed:

not specified

Conclusions:

The 'No Observed Effect Level' (NOEL) for reproductive toxicity was considered to be 1000 mg/kg bw/day. The NOAEL for systemic toxicity was also considered to be 1000 mg/kg bw/day.

Executive summary:

The reproductive toxicity of the test item 9-dodecenoic acid, methyl ester via the oral route has been read-across from the substance 9-decenoic acid, methyl ester from the following study:

A 28 day repeat dose oral toxicity study combined with a reproduction/ developmental toxicity screening test of the test item was performed in the Wistar rat, according to OECD Guideline 422, in compliance with GLP. The test item, 9-decenoic acid, methyl ester was administered by gavage to three groups, each of ten male and ten female Wistar Han™:RccHan™:WIST strain rats, for up to eight weeks (including a two week pre-pairing phase, pairing, gestation and early lactation for females), at dose levels of 30, 300 and 1000 mg/kg bw/day. There were no treatment related effects observed on mating, fertility or gestation length at any dose level. The offspring litter size, sex ratio, viability, growth and development were all comparable to controls and no adverse effects were noted. Since no treatment-related effects were observed for reproduction, a NOEL for reproductive toxicity was considered to be 1000 mg/kg bw/ day (Harlan Laboratories Ltd, 2012). Based on the results of the read across study, a similar NOEL can be expected for the test item.

 

Effect on fertility: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

1 000 mg/kg bw/day

Species:

rat

Effect on fertility: via inhalation route

Endpoint conclusion:

no study available

Effect on fertility: via dermal route

Endpoint conclusion:

no study available

Effects on developmental toxicity

Description of key information

Refer to description of OECD 422 results in effects on fertility section.

Effect on developmental toxicity: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

1 000 mg/kg bw/day

Species:

rat

Effect on developmental toxicity: via inhalation route

Endpoint conclusion:

no study available

Effect on developmental toxicity: via dermal route

Endpoint conclusion:

no study available

Justification for classification or non-classification

Under the conditions of the OECD 422 study, conducted on a structural analogue substance, the test item administered to male and female rats up to a dose level of 1000 mg/kg bw/day for a period of up to 8 weeks is not toxic to reproduction and has no effect on fertility or development. No treatment-related effects were observed for reproduction; hence, a NOEL for reproductive toxicity was considered to be 1000 mg/kg bw/day.

Based on these results, octadecanedioic acid, 1,18-dimethyl ester

does not warrant classification according to the criteria described in Regulation (EC) No 1272/2008.