Nonanoic acid, esters with adipic acid and trimethylolpropane

Endpoint summary

Description of key information

Acute oral toxicity (OECD 423, GLP, read across): LD50 (rat) > 2000 mg/kg bw

Acute inhalation toxicity (OECD 403, GLP, read across): LC50 (rat) > 5.05 mg/mL

Acute dermal toxicity (OECD 402, GLP, read across): LD50 (rat) > 2000 mg/kg bw

Key value for chemical safety assessment

Acute toxicity: via oral route

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Quality of whole database:

The available information comprises adequate, reliable studies from reference substances with similar structure and intrinsic properties. Read-across is justified based on common functional group(s) (please refer to endpoint discussion for further details). Taken together, the information from these independent sources is consistent and provides sufficient information for hazard assessment leading to an endpoint conclusion in accordance with Annex XI, 1.2, of Regulation (EC) No 1907/2006. Therefore, the available information as a whole is sufficient to fulfil the standard information requirements set out in Annex VII-VIII, 8.5, in accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006.

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Quality of whole database:

The available information comprises an adequate and reliable study from a reference substance with similar structure and intrinsic properties. Read-across is justified based on common functional group(s) (please refer to endpoint discussion for further details). The selected study is thus sufficient to fulfil the standard information requirements set out in Annex VII-VIII, 8.5, in accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006.

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Quality of whole database:

The available information comprises an adequate and reliable study from a reference substance with similar structure and intrinsic properties. Read-across is justified based on common functional group(s) (please refer to endpoint discussion for further details). The selected study is thus sufficient to fulfil the standard information requirements set out in Annex VII-VIII, 8.5, in accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006.

Additional information

Justification for read-across

There are no data available on acute toxicity properties of the target substance Nonanoic acid, esters with adipic acid and trimethylolpropane. Therefore, read-across from the appropriate structural analogue substances trimethylolpropane tripelargonate (CAS 126-57-8) and Fatty acids, C8-10, mixed esters with adipic acid and trimethylolpropane (CAS 95912-89-3) is conducted in accordance with Regulation (EC) No 1907/2006, Annex XI, 1.5. in order to fulfil the standard information requirements defined in Regulation (EC) No 1907/2006, Annex VII-VIII, 8.5. Common functional groups and structural similarities combined with similar toxicokinetic properties of the source and target substances are the basis of read-across. A detailed justification for the analogue read-across approach is provided in the technical dossier (see IUCLID Section 13).

Acute Oral Toxicity

CAS 126-57-8

The acute toxicity of the source substance trimethylolpropane tripelargonate (CAS 126-57-8) following a single oral administration to the Sprague Dawley rat was investigated (Research Toxicology Center, 2014). A first group of 3 female animals was initially dosed at 2000 mg/kg bw (Step 1). No mortality occurred and no clinical signs were observed. A second group of 3 female animals was then dosed at the same dose level (Step 2). No mortality occurred and no clinical signs were noted. Body weight changes recorded during the study were within the expected range for this strain and age of animals. No abnormalities were observed at necropsy examination performed at the end of the 14-day observation period on animals of both groups. These results indicate that the test substance trimethylolpropane tripelargonate did not induce toxic effects in the rat following oral administration of a single dose at a level of 2000 mg/kg bw. The LD50 value was considered to be greater than 2000 mg/kg bw.

CAS 95912-89-3

An acute oral toxicity study was performed with the source substance Fatty acids, C8-10, mixed esters with adipic acid and trimethylolpropane (CAS 95912-89-3) under conditions of GLP and according to the up-and down method described in OECD guideline 425 (Phycher Bio, 2010). In this experiment, 3 female Sprague Dawley rats were treated sequentially with the test substance via gavage at a limit dose of 5000 mg/kg bw. No Mortality occurred and no clinical signs of toxicity were observed up to the end of the 14-day observation period. No effect on body weight was noted. Macroscopic and microscopic examinations did not reveal any treatment-related findings. Based on these data, an oral LD50 value > 5000 mg/kg bw was derived for Fatty acids, C8-10, mixed esters with adipic acid and trimethylolpropane.

Acute Inhalation Toxicity

CAS 95912-89-3

In a GLP-conform study according to OECD guideline 403, the acute inhalation toxicity of the source substance Fatty acids, C8-10, mixed esters with adipic acid and trimethylolpropane (CAS 95912-89-3) was investigated in Crl:CD(SD) rats (LPT, 2012). Using a nose-only exposure system, the 5 male and 5 female animals were exposed to the test aerosol at an analytical atmosphere concentration of 5.05 mg/L air (5050 mg/m³ air) for 4 h. No mortality occurred during the 14-day observation period. Clinical signs of toxicity included slight ataxia, slight tremor and slight dyspnoea immediately until 30 min or 3 h after end of exposure in all male and female animals. Body weights were not adversely affected by treatment and the expected weight gain was observed in all animals during the course of the study. At necropsy, no pathological findings were observed. Based on these results, the LC50 value for Fatty acids, C8-10, mixed esters with adipic acid and trimethylolpropane was considered to be > 5.05 mg/L air.

Acute Dermal Toxicity

CAS 126-57-8

The acute dermal toxicity of the source substance trimethylolpropane tripelargonate (CAS 126-57-8) was investigated following dermal administration of a single dose to the rat (RTC, 2014). A single dose of 2000 mg/kg bw was administered to a group of 5 male and 5 female animals for 24 hours. After 14 days, all animals were killed and subjected to necropsy examination. No mortality occurred and no signs of toxicity were observed in male or female animals during the observation period. The body weight changes observed during the study were within the expected range for this species and age of animals. No abnormalities were found at necropsy in the animals at termination of the study, nor at the treated site. The LD50 value was considered to be greater than 2000 mg/kg bw.

Overall conclusion

The available data with the source substances trimethylolpropane tripelargonate (CAS 126-57-8) and Fatty acids, C8-10, mixed esters with adipic acid and trimethylolpropane (CAS 95912-89-3) showed no hazardous properties after single treatment following oral and dermal administration and by inhalation, respectively. Therefore applying the read-across approach similar results are expected for the target substance.

Justification for classification or non-classification

According to Article 13 of Regulation (EC) No. 1907/2006 "General Requirements for Generation of Information on Intrinsic Properties of substances", information on intrinsic properties of substances may be generated by means other than tests e.g. from information from structurally related substances (grouping or read-across), provided that conditions set out in Annex XI are met. Annex XI, "General rules for adaptation of this standard testing regime set out in Annexes VII to X” states that “substances whose physicochemical, toxicological and ecotoxicological properties are likely to be similar or follow a regular pattern as a result of structural similarity may be considered as a group, or ‘category’ of substances. This avoids the need to test every substance for every endpoint". Since the analogue concept is applied to Nonanoic acid, esters with adipic acid and trimethylolpropane, data will be generated from data for reference source substance(s) to avoid unnecessary animal testing. Additionally, once the analogue read-across concept is applied, substances will be classified and labelled on this basis.

Therefore, based on the analogue read-across approach, the available data on acute oral, dermal and inhalation toxicity do not meet the classification criteria according to Regulation (EC) 1272/2008 and are therefore conclusive but not sufficient for classification.