N,N-dimethyldecylamine N-oxide

Toxicological Summary

Workers - Hazard via inhalation route

Systemic effects

Long term exposure

Hazard assessment conclusion:

DNEL (Derived No Effect Level)

Value:

6.2 mg/m³

Most sensitive endpoint:

repeated dose toxicity

Route of original study:

Oral

DNEL related information

DNEL derivation method:

ECHA REACH Guidance

Overall assessment factor (AF):

25

Modified dose descriptor starting point:

NOAEC

Value:

155 mg/m³

Explanation for the modification of the dose descriptor starting point:

No justification for route to route extrapolation needed

AF for dose response relationship:

1

AF for differences in duration of exposure:

2

Justification:

DNEL is based on oral 90-day study

AF for interspecies differences (allometric scaling):

1

Justification:

AF not used for inhalation route

AF for other interspecies differences:

2.5

AF for intraspecies differences:

5

AF for the quality of the whole database:

1

AF for remaining uncertainties:

1

Acute/short term exposure

Hazard assessment conclusion:

hazard unknown (no further information necessary)

DNEL related information

Local effects

Long term exposure

Hazard assessment conclusion:

hazard unknown (no further information necessary)

Acute/short term exposure

Hazard assessment conclusion:

hazard unknown (no further information necessary)

DNEL related information

Workers - Hazard via dermal route

Systemic effects

Long term exposure

Hazard assessment conclusion:

DNEL (Derived No Effect Level)

Value:

11 mg/kg bw/day

Most sensitive endpoint:

repeated dose toxicity

Route of original study:

Oral

DNEL related information

DNEL derivation method:

ECHA REACH Guidance

Overall assessment factor (AF):

100

Modified dose descriptor starting point:

NOAEL

Value:

1 100 mg/kg bw/day

Explanation for the modification of the dose descriptor starting point:

No justification for route to route extrapolation needed

AF for dose response relationship:

1

AF for differences in duration of exposure:

2

Justification:

DNEL is based on oral 90-day study

AF for interspecies differences (allometric scaling):

4

AF for other interspecies differences:

2.5

AF for intraspecies differences:

5

AF for the quality of the whole database:

1

AF for remaining uncertainties:

1

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

DNEL related information

Local effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

Workers - Hazard for the eyes

Local effects

Hazard assessment conclusion:

medium hazard (no threshold derived)

Additional information - workers

Acute systemic effects

Oral: According to the Guidance on information requirements and chemical safety assessment Chapter R.8: Characterisation of dose [concentration]-response for human health, a DNEL for acute toxicity should be derived if an acute toxicity hazard (leading to C&L) has been identified and there is a potential for high peak exposures. Amine oxides are typically manufactured as aqueous solutions containing 30 -40 % AO and as such are not classified. In addition, high peak exposure is unlikely to occur.

Dermal: In an acute dermal toxicity study performed using C10 AO there were no mortalities, signs of systemic toxicity or abnormalities observed during necropsy which would lead to classification. It can therefore be expected that acute dermal exposure of the substance causes no systemic toxic effects and hence no DNEL has to be derived.

Inhalation: No acute inhalation study is available. The substance has a very low estimated vapour pressure and therefore peak exposures via this route are not anticipated. The long term inhalation DNEL will be protective of short term exposures

Acute local effects

Dermal: The substance is not classified for skin irritation or sensitisation hence no hazard has been identified

Eyes: The substance is classified as corrosive to eyes and is considered to have a medium hazard potential

Inhalation: No data on local effects resulting from acute inhalation exposure are available. It is not anticipated that exposure via the inhalation route is likely to occur at levels that may cause local effects.

Long-term systemic effects

Dermal: No repeated dose dermal toxicity studies are available for C10 AO. Studies are available for another member of the amine oxide category – C12-14 AO. These studies are read across to C10 AO. No systemic effects were observed in any of the studies. In order to derive the DNEL route to route extrapolation is used from the oral NOAEL of 88 mg/kg bw/day (derived from a study performed on C12 -14 AO and read across to C10 AO). This study provides the highest NOAEL below the lowest LOAEL.The oral NOAEL is modified to take account of the human dermal penetration (8 %) by dividing by a factor of 0.08 resulting in a NOAEL after route to route extrapolation of 1100 mg/kg bw/day. Assessment factors applied to this NOAEL are based on the recommendations in the Guidance on Information Requirements and Chemical Safety Assessment Chapter R.8: Characterisation of dose [concentration]-response for human healthcare as follows: AF(total) = 2 (subchronic to chronic) x 2.5 (interspecies) x 4 (allometric scaling) x 5 (intraspecies, workers) = 100.

Systemic long-term dermal DNEL (worker) = 11 mg/kg bw/day

Inhalation: No repeat dose inhalation studies are available. In order to derive the DNEL route to route extrapolation is used from the oral NOAEL of 88 mg/kg bw/day (derived from a study performed on C12 -14 AO and read across to C10 AO). This study provides the highest NOAEL below the lowest LOAEL. The NOAEL(oral) was converted into a NOAEC(inhalation) using the equation described in Figure R. 8-3 of the Guidance on Information Requirements and Chemical Safety Assessment Chapter R.8: Characterisation of dose [concentration]-response for human healthcare. Absorption via the oral route for rat is 100 % and via the inhalation route for humans is assumed to be 100 % as worse case. Using this method resulted in a NOAEC of 155.2 mg/m3. Assessment factors are applied to the NOAEC based on the recommendations in the above Guidance document as follows: AF(total) = 2 (subchronic to chronic) x 2.5 (other interspecies differences) x 5 (intraspecies, workers) = 25.

Systemic long-term inhalation DNEL (worker) = 6.2 mg/m³

Long term local effects

Dermal: Tests performed using C10 AO have shown the substance to be non-irritant to the skin of rabbits and non-sensitising to the skin of Guinea pigs. Local effects arising from long term exposure to solutions containing the substance are not expected and no DNEL is derived.

Inhalation: No data on local effects resulting from long term inhalation exposure are available. It is not anticipated that exposure via the inhalation route is likely to occur at levels that may cause local effects.

General Population - Hazard via inhalation route

Systemic effects

Long term exposure

Hazard assessment conclusion:

DNEL (Derived No Effect Level)

Value:

1.53 mg/m³

Most sensitive endpoint:

repeated dose toxicity

Route of original study:

Oral

DNEL related information

DNEL derivation method:

ECHA REACH Guidance

Overall assessment factor (AF):

50

Modified dose descriptor starting point:

NOAEC

Value:

76.5 mg/m³

Explanation for the modification of the dose descriptor starting point:

No justification for route to route extrapolation needed

AF for dose response relationship:

1

AF for differences in duration of exposure:

2

Justification:

DNEL is based on oral 90-day study

AF for interspecies differences (allometric scaling):

1

Justification:

AF not used for inhalation route

AF for other interspecies differences:

2.5

AF for intraspecies differences:

10

AF for the quality of the whole database:

1

AF for remaining uncertainties:

1

Acute/short term exposure

Hazard assessment conclusion:

hazard unknown (no further information necessary)

DNEL related information

Local effects

Long term exposure

Hazard assessment conclusion:

hazard unknown (no further information necessary)

Acute/short term exposure

Hazard assessment conclusion:

hazard unknown (no further information necessary)

DNEL related information

General Population - Hazard via dermal route

Systemic effects

Long term exposure

Hazard assessment conclusion:

DNEL (Derived No Effect Level)

Value:

5.5 mg/kg bw/day

Most sensitive endpoint:

repeated dose toxicity

Route of original study:

Oral

DNEL related information

DNEL derivation method:

ECHA REACH Guidance

Overall assessment factor (AF):

200

Modified dose descriptor starting point:

NOAEL

Value:

1 100 mg/kg bw/day

Explanation for the modification of the dose descriptor starting point:

No justification for route to route extrapolation needed

AF for dose response relationship:

1

AF for differences in duration of exposure:

2

Justification:

DNEL is based on oral 90-day study

AF for interspecies differences (allometric scaling):

4

AF for other interspecies differences:

2.5

AF for intraspecies differences:

10

AF for the quality of the whole database:

1

AF for remaining uncertainties:

1

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

DNEL related information

Local effects

Long term exposure

Hazard assessment conclusion:

no hazard identified

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

General Population - Hazard via oral route

Systemic effects

Long term exposure

Hazard assessment conclusion:

DNEL (Derived No Effect Level)

Value:

0.44 mg/kg bw/day

Most sensitive endpoint:

repeated dose toxicity

Route of original study:

Oral

DNEL related information

DNEL derivation method:

ECHA REACH Guidance

Overall assessment factor (AF):

200

Modified dose descriptor starting point:

NOAEL

Value:

88 mg/kg bw/day

Explanation for the modification of the dose descriptor starting point:

Route to route extrapolation not used

AF for dose response relationship:

1

AF for differences in duration of exposure:

2

Justification:

DNEL is based on oral 90-day study

AF for interspecies differences (allometric scaling):

4

AF for other interspecies differences:

2.5

AF for intraspecies differences:

10

AF for the quality of the whole database:

1

AF for remaining uncertainties:

1

Acute/short term exposure

Hazard assessment conclusion:

no hazard identified

DNEL related information

General Population - Hazard for the eyes

Local effects

Hazard assessment conclusion:

medium hazard (no threshold derived)

Additional information - General Population

Acute systemic effects

Oral: According to the Guidance on information requirements and chemical safety assessment Chapter R.8: Characterisation of dose [concentration]-response for human health, a DNEL for acute toxicity should be derived if an acute toxicity hazard (leading to C&L) has been identified and there is a potential for high peak exposures. Consumer products contain a maximum of 15 % amine oxide and are not classified. In addition, high peak exposure is unlikely to occur.

Dermal: In an acute dermal toxicity study performed using C10 AO there were no mortalities, signs of systemic toxicity or abnormalities observed during necropsy which would lead to classification. It can therefore be expected that acute dermal exposure of the substance causes no systemic toxic effects and hence no DNEL has to be derived.

Inhalation: No acute inhalation study is available. The substance has a very low estimated vapour pressure and therefore peak exposures via this route are not anticipated. The long term inhalation DNEL will be protective of short term exposures

Acute local effects

Dermal: The substance is not classified for skin irritation or sensitisation hence no hazard has been identified.

Eyes: The substance is classified as corrosive to eyes and is considered to have a medium hazard potential.

Inhalation: No data on local effects resulting from acute inhalation exposure are available. It is not anticipated that exposure via the inhalation route is likely to occur at levels that may cause local effects.

Long-term systemic effects

Oral: The NOAEL of 88 mg AO/kg bw/day for repeated dose oral toxicity used to calculate the DNEL is derived from a 90-day feeding study in rats (derived from a study performed on C12-14 AO and read across to C10 AO). This study provides the highest NOAEL below the lowest LOAEL. Assessment factors applied to this NOAEL are based on the recommendations in the Guidance on Information Requirements and Chemical Safety Assessment Chapter R.8: Characterisation of dose [concentration]-response for human healthcare as follows: AF(total) = 2 (subchronic to chronic) x 2.5 (interspecies) x 4 (allometric scaling) x 10 (intraspecies, consumers) = 200

Systemic long-term oral DNEL (consumer) = 0.44 mg/kg bw/day

Dermal: No repeated dose dermal toxicity studies are available for C10 AO. Studies are available for another member of the amine oxide category – C12-14 AO. These studies are read across to C10 AO. No systemic effects were observed in any of the studies. In order to derive the DNEL route to route extrapolation is used from the oral NOAEL of 88 mg/kg bw/day (derived from a study performed on C12-14 AO and read across to C10 AO). This study provides the highest NOAEL below the lowest LOAEL. The oral NOAEL is modified to take account of the human dermal penetration (8 %) by dividing by a factor of 0.08 resulting in a NOAEL after route to route extrapolation of 1100 mg/kg bw/day. Assessment factors applied to this NOAEL are based on the recommendations in the Guidance on Information Requirements and Chemical Safety Assessment Chapter R.8: Characterisation of dose [concentration]-response for human healthcare as follows: AF(total) = 2 (subchronic to chronic) x 2.5 (interspecies) x 4 (allometric scaling) x 10 (intraspecies, consumers) = 200.

Systemic long-term dermal DNEL (consumer) = 5.5 mg/kg bw/day

Inhalation: No repeat dose inhalation studies are available. In order to derive the DNEL route to route extrapolation is used from the oral NOAEL of 88 mg/kg bw/day (derived from a study performed on C12-14 AO and read across to C10 AO). This study provides the highest NOAEL below the lowest LOAEL. The NOAEL(oral) was converted into a NOAEC(inhalation) using the equation described in Figure R. 8-3 of the Guidance on Information Requirements and Chemical Safety Assessment Chapter R.8: Characterisation of dose [concentration]-response for human healthcare. Absorption via the oral route for rat is 100 % and via the inhalation route for humans is assumed to be 100 % as worse case. Using this method resulted in a NOAEC of 76.5 mg/m3. Assessment factors are applied to the NOAEC based on the recommendations in the above Guidance document as follows: AF(total) = 2 (subchronic to chronic) x 2.5 (other interpsecies differences) x10 (intraspecies, consumers) = 50.

Systemic long-term inhalation DNEL (consumer) = 1.53 mg/m³

Long term local effects

Dermal: Tests performed using C10 AO have shown the substance to be non-irritant to the skin of rabbits and non-sensitising to the skin of Guinea pigs. Local effects arising from long term exposure to solutions containing the substance are not expected and no DNEL is derived.

Inhalation: No data on local effects resulting from long term inhalation exposure are available. It is not anticipated that exposure via the inhalation route is likely to occur at levels that may cause local effects.