Registration Dossier

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
basic toxicokinetics, other
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

Key value for chemical safety assessment

Bioaccumulation potential:
no bioaccumulation potential
Absorption rate - oral (%):
50
Absorption rate - dermal (%):
50
Absorption rate - inhalation (%):
100

Additional information

Assessment of Toxicokinetics based on the physicochemical properties of 2,6-dimethylheptan-2-ol:

Endpoint waiver statement:

Although REACH does not specifically require generation of toxicokinetic information, it does require that all relevant available information is used to assess the toxicokinetic behaviour of a substance, and that human health hazard assessment considers the toxicokinetic profile of the substance.

2,6-dimethylheptan-2-ol is a small organic molecule and the physico-chemical properties suggest it is likely to be absorbed via dermal, inhalation and gastric routes following exposure. Acute and subchronic toxicity data indicate that 2,6-dimethylheptan-2-ol is absorbed following oral administration and metabolised by the liver. No specific studies on the absorption, distribution, metabolism and elimination (ADME) of are available. However the very low toxicity of 2,6-dimethylheptan-2-ol suggests that it may be considered inappropriate at this time to conduct further animal work to support ADME.

Endpoint Summary:

2,6-dimethylheptan-2-ol: (Target)

Molecular weight: 144.20 g/mol

Water solubility: 745 mg/L at 20°C

Partition coefficient: log Kow = 3

The following remarks on the toxicokinetics are based on the available studies.

Experimental toxicokinetic studies were not available.

No specific studies on the absorption, distribution, metabolism and elimination (ADME) of 2,6-dimethylheptan-2-ol are available. However the very low toxicity of 2,6-dimethylheptan-2-ol suggests that it may be considered inappropriate at this time to conduct further animal work to support ADME.

 

ABSORPTION

The physicochemical characteristics of 2,6-dimethylheptan-2-ol (log Pow 3) and the molecular mass are in a range suggestive of absorption from the gastro-intestinal tract subsequent to oral ingestion. This assumption of oral absorption is confirmed by the data from the subchronic oral toxicity.

 

N-octanol/water partition coefficient and molecular weight of 2,6-dimethylheptan-2-ol are in ranges which favour dermal absorption.

 

DISTRIBUTION and METABOLISM

As a small molecule a wide distribution is expected. This assumption is confirmed by the changes shown in the repeated dose toxicity studies following oral application.

 

ELIMINATION

The n-Octanol/water partition coefficient (log Pow 3) is suggestive of accumulation of unchanged 2,6-dimethylheptan-2-ol in fatty tissues subsequent to absorption from gastrointestinal tract or from lungs.

 

The following information is taken into account for any hazard / risk assessment:

 

Experimental toxicokinetic studies are not available. The log Pow 3 is suggestive of accumulation of unchanged 2,6-dimethylheptan-2-ol in fatty tissues subsequent to absorption from gastro-intestinal tract or from lungs.