Reaction product of adipic acid and sebacic acid and isotridecan-1-ol

Toxicological Summary

Workers - Hazard via inhalation route

Systemic effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Value:

24 mg/m³

Most sensitive endpoint:

developmental toxicity / teratogenicity

DNEL related information

Overall assessment factor (AF):

12.5

Modified dose descriptor starting point:

NOAEC

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

DNEL related information

Local effects

Acute/short term exposure

DNEL related information

Workers - Hazard via dermal route

Systemic effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Value:

3.4 mg/kg bw/day

Most sensitive endpoint:

developmental toxicity / teratogenicity

DNEL related information

Overall assessment factor (AF):

50

Modified dose descriptor starting point:

NOAEL

Acute/short term exposure

DNEL related information

Additional information - workers

For the test item Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol is no study available. However, it is likely that the studies conducted on the component diisotridecyl adipate and the read-across substance bis (2 -ethylhexyl) adipate are valid for Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol (please see justification for read-across).

Acute / short-term exposure - systemic effects

 

In acute toxicity studies, the comonent diisotridecyl adipate has been shown to be of low systemic toxicity.

 

LD50 oral: > 15000 mg/kg bw in rats (Moreno/Mobil, 1978a)

LD50 dermal: > 5000 mg/kg bw in rabbits (Moreno/Mobil, 1978b).

 

From present studies, reliable short-term dose response relations cannot be deduced. Available data do not provide sufficient information on sublethal toxic effects to gather NOAELs as starting points. DNELs cannot be derived.

In accordance with ECHA Guidance on information requirements and chemical safety assessment - Chapter R.8, DN(M)EL need not be derived in case of low acute toxicity.

 

Acute /short-term exposure - local effects

 

The component Diisotridecyl adipate is not irritating to skin or to eyes. Data on inhalation exposure could not be located.

From the data available, reliable dose descriptors cannot be obtained. DNELs cannot be derived as there are no suitable starting points.

 

Long term exposure systemic effects

 

To assess the risk of long-term exposure - systemic effects for Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol, data for di-2-ethylhexyl adipate as supporting substance will be used based on the close structural relationship of both substances (Justification in more detail is presented in endpoint summary to section 7.1.1 - basic toxicokinetics).

 

For di-2-ethylhexyl adipate, several valid studies concerning repeated dose toxicity are available. Besides a 28 day oral study (Miyata, 2006), the substance was investigated by NTP in subchronic and chronic studies in two species (rat and mouse) (NTP, 1982). In addition, there is an oral one-generation reproduction toxicity study with an exposure period of 10 weeks for parental animals (Cefic, 1989).

Other administration routes have been examined for diisotridecyl adipate itself (Mobil, 1989, aerosol inhalation for 14 days) and for ditridecyl adipate (HPV TP, 2003, dermal,13 weeks). This data are of low reliability and are not used for the derivation of DNELs.

The most critical NOAEL was observed in the one-generation study (170 mg/kg bw/day - effects on the offspring: reduced total litter weight and reduced mean litter size). At the same time, this is the lowest NOAEL determined in repeated dose toxicity studies. This value will be taken for derivation of a DNEL for Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol.

DNELs for Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol

The NOAEL of 170 mg/kg bw/day determined for di-2-ethylhexyl adipate is used for the DNEL-derivation.

Worker long term exposure - systemic effects (oral, dermal and inhalation) DNELs were calculated form the NOAEL, assuming a 100 % dermal

(worst case) and inhalation rate.

 

DNEL dermal - systemic effects

According to ECHA TGD Guidance on information requirements and chemical safety assessment -Chapter R.8: Characterisation of dose[concentration]-response for human health, the NOAEL oral can be used for the deduction of a DNEL dermal without further adjustment. As default, absorption for oral and dermal route is considered equal as long as more definite experimental information is not available.

Assessment factors used are a) allometric scaling factor of 4, b) factor for remaining interspecies differences of 2.5, c) intraspecies factor (worker) of 5. The factor for sub-chronic to chronic exposure extrapolation is set to 1 as for developmental effects chronic exposure is not relevant. With a starting point NOAEL dermal of 170 mg/kg bw/day and an overall assessment factor of 50, a DNEL of 3.4 mg/kg bw/day for

Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol is calculated.

 

DNEL inhalation -systemic effects

The corrected worker inhalation starting point was the corrected NOAEC of 300 mg/m3 and was derived form the oral NOAEL of 170 mg/kg bw/day multiplying by the inverse of the standard respiratory volume of the rat during an 8 hour period (2.63) and multiplied by the ratio of standard respiratory volume for humans to the 8 hour worker standard respiratory volume (0.67). The corrected starting point was adjusted by a factor of 12.5

(factor for remaining interspecies differences 2.5, intraspecies factor (worker) 5, factor for sub-chronic to chronic exposure extrapolation 1, see above)resulting in an calculated DNEL of 24 mg/m3.

Long-term exposure - local effects

 

The irritation potential of Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol

is low as demonstrated in acute skin and eye irritation tests. Dose descriptors for long term exposure local effects are not available. DNELs for long-term-exposure local effects are not derived.

General Population - Hazard via inhalation route

Systemic effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Value:

10.44 mg/m³

Most sensitive endpoint:

developmental toxicity / teratogenicity

DNEL related information

Overall assessment factor (AF):

25

Modified dose descriptor starting point:

NOAEC

Acute/short term exposure

DNEL related information

Local effects

Acute/short term exposure

DNEL related information

General Population - Hazard via dermal route

Systemic effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Value:

1.7 mg/kg bw/day

Most sensitive endpoint:

developmental toxicity / teratogenicity

DNEL related information

Overall assessment factor (AF):

100

Modified dose descriptor starting point:

NOAEL

Acute/short term exposure

DNEL related information

General Population - Hazard via oral route

Systemic effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Value:

1.77 mg/kg bw/day

Most sensitive endpoint:

developmental toxicity / teratogenicity

DNEL related information

Overall assessment factor (AF):

100

Modified dose descriptor starting point:

NOAEL

Acute/short term exposure

DNEL related information

Additional information - General Population

For the test item Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol is no study available. However, it is likely that the studies conducted on the component diisotridecyl adipate and the read-across substance bis(2 -ethylhexyl) adipate are valid for Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol (please see justification for read-across).

Acute / short-term exposure - systemic effects

 

In acute toxicity studies, the component diisotridecyl adipate has been shown to be of low systemic toxicity.

 

LD50 oral: > 15000 mg/kg bw in rats (Moreno/Mobil, 1978a)

LD50 dermal: > 5000 mg/kg bw in rabbits (Moreno/Mobil, 1978b).

 

From present studies, reliable short-term dose response relations cannot be deduced. Available data do not provide sufficient information on sublethal toxic effects to gather NOAELs as starting points. DNELs cannot be derived.

In accordance with ECHA Guidance on information requirements and chemical safety assessment - Chapter R.8, DN(M)EL need not be derived in case of low acute toxicity.

 

Acute /short-term exposure - local effects

 

The component Diisotridecyl adipate is not irritating to skin or to eyes. Data on inhalation exposure could not be located.

From the data available, reliable dose descriptors cannot be obtained. DNELs cannot be derived as there are no suitable starting points.

 

Long term exposure systemic effects

 

To assess the risk of long-term exposure - systemic effects for Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol, data for di-2-ethylhexyl adipate as supporting substance will be used based on the close structural relationship of both substances (Justification in more detail is presented in endpoint summary to section 7.1.1 - basic toxicokinetics).

 

For di-2-ethylhexyl adipate, several valid studies concerning repeated dose toxicity are available. Besides a 28 day oral study (Miyata, 2006), the substance was investigated by NTP in subchronic and chronic studies in two species (rat and mouse) (NTP, 1982). In addition, there is an oral one-generation reproduction toxicity study with an exposure period of 10 weeks for parental animals (Cefic, 1989).

Other administration routes have been examined for diisotridecyl adipate itself (Mobil, 1989, aerosol inhalation for 14 days) and for ditridecyl adipate (HPV TP, 2003, dermal,13 weeks). This data are of low reliability and are not used for the derivation of DNELs.

The most critical NOAEL was observed in the one-generation study (170 mg/kg bw/day - effects on the offspring: reduced total litter weight and reduced mean litter size). At the same time, this is the lowest NOAEL determined in repeated dose toxicity studies. This value will be taken for derivation of a DNEL for Reaction product of adipic acid and sebacic acid and isotredecan-1 -ol.

 

DNELs for Reaction product of adipic acid and sebacic acid and isotredecan-1 -ol

The NOAEL of 170 mg/kg bw/day determined for di-2-ethylhexyl adipate is used for the DNEL-derivation.

General population long-term exposure - systemic effects (oral, dermal and inhalation) DNELs were calculated form the NOAEL, assuming a 100 % dermal (worst case) and inhalation absorption rate.

DNEL dermal and oral- systemic effects

According to ECHA TGD Guidance on information requirements and chemical safety assessment -Chapter R.8: Characterisation of dose[concentration]-response for human health, the NOAEL oral can be used for the deduction of a DNEL dermal without further adjustment. As default, absorption for oral and dermal route is considered equal as long as more definite experimental information is not available.

Assessment factors used are a) allometric scaling factor of 4, b) factor for remaining interspecies differences of 2.5, c) intraspecies factor (general population) of 10. The factor for sub-chronic to chronic exposure extrapolation is set to 1 as for developmental effects chronic exposure is not relevant. With a starting point NOAEL dermal of 170 mg/kg bw/day and an overall assessment factor of 100, a DNEL of 1.7 mg/kg bw/day for Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol is calculated.

 

DNEL inhalation -systemic effects

The corrected worker inhalation starting point was the corrected NOAEC of 300 mg/m3 and was derived form the oral NOAEL of 170 mg/kg bw/day multiplying by the inverse of the standard respiratory volume of the rat during an 24 hour period (0.87). The corrected starting point was adjusted by a factor of 25 (factor for remaining interspecies differences 2.5, intraspecies factor (general population) 10, factor for sub-chronic to chronic exposure extrapolation 1, see above) resulting in an calculated DNEL of 10.44 mg/m3.

 

Long-term exposure - local effects

 

The irritation potential of Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol is low as demonstrated

in acute skin and eye irritation tests. Dose descriptors for long term exposure local effects are not available. DNELs for long-term-exposure local effects are not derived.