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Administrative data

Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Between 23 January 2009 and 27 February 2009.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report date:
2009

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.8 (Partition Coefficient)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Date of GLP inspection: 19/08/2008 Date of Signature on GLP certificate: 04/03/2009
Type of method:
HPLC method
Partition coefficient type:
octanol-water

Test material

Constituent 1
Details on test material:
- Name of test material (as cited in study report): Eldew APS-307
- Substance type: Organic (UVCB)
- Physical state: Pale yellow waxy solid
- Analytical purity: 100%
- Lot/batch No.: 809114
- Stability under test conditions: stable
- Date received: 22 December 2008
- Storage condition of test material: Room temperature, in the dark

Study design

Analytical method:
high-performance liquid chromatography

Results and discussion

Partition coefficient
Type:
log Pow
Partition coefficient:
> 6.5
Temp.:
30 °C
pH:
6.4
Details on results:

Results:
Preliminary estimate:
Approximate solubility in n-octanol: >48.5% w/w
Aproximate solubility in water: <1.4 x 10E-4 % w/w
Approximate Pow: >3.6 x 10E5
Log10 Pow: >5.54

Results from Definitive Test:
Mean Log Pow: >6.50
Partition coefficient: >3.162 x 10E6.

Any other information on results incl. tables

Definitive test:

Calibration

The retention times (RT) in minutes of the deadtime and the retention times, capacity factors (k) and log10Pow values for the reference standards are shown in the following tables below:

 Dead time  RT (mins) (Injection 1)   RT (mins) (Injection 2)   Mean RT (mins) 
Thiourea  1.557 1.556 1.557

Stanadard RT injection1   RT injection 2  Mean RT (mins)  Capacity factor (k)  Log10 Log10Pow 
2 -Butanone 1.830 1.832 1.831 0.176 -0.754 0.3
Benzonitrile 2.039 2.042 2.041 0.311 -0.507 1.6
Toluene 3.435 3.440 3.438 1.208 8.22 x 10-2 2.7
Naphthalene 3.878 3.884 3.881 1.493 0.174 3.6
Phenanthrene 5.816 5.820 5.818 2.738 0.437 4.5
DDT  18.337 18.322 18.330 10.776 1.032  6.5 

Partition coefficient of sample: The retention times, capacity factors and log10 Pow values determined for the sample are shown in the table below:

Peak No.  Injection  RT (mins)  Capacity factor (k)  Log10 Log10Pow   Overall Log10Pow
37.044 22.800 1.358 >6.50    >6.50 
37.050 22.803 1.358  >6.50    >6.50 
2 1  37.413  23.037  1.362   >6.50   >6.50  
2 2  37.419  23.040  1.362   >6.50   >6.50  
3 1  38.167   23.521   1.371    >6.50    >6.50  
3 2  38.175   23.526   1.372    >6.50    >6.50  

Discussion:

Substances having a logl0 Pow greater than 3 are regarded as having the potential to bioaccumulate in the environment. Identification of the major peaks of interest (decyltetradecyl myristoyl beta alaninate and phytosteryl myristoyl beta alaninate) was performed using analytical details provided by the Sponsor. In the absence of any dissociating functional groups within the environmentally relevant pH range, no specific manipulation of the mobile phase pH was necessary to ensure that the test material was analysed in a non-ionised form. Insignificant differences in the test material peak retention times were observed following the subtraction of a solvent blank (methanol) injection. However this had no impact on the limit value obtained for the partition coefficient result.

To conclude, the partition coefficient of the test material has been determined to be greater than 3.16 x 106, log10 Pow >6.50.

Applicant's summary and conclusion

Conclusions:

The partition coefficient of the test material has been determined to be > 3.16 x 10E6, log Pow >6.50.
Executive summary:

Method

The determination was carried out using the HPLC Method, Method A8 Partition Coefficient of Council Regulation (EC) No 440/2008 of 30 May 2008.

 

Mean Log10 Pow >6.50

Partition Coefficient: > 3.162 x 106

Conclusion

To conclude, the partition coefficient of the test material has been determined to be greater than 3.16 x 106, log10 Pow >6.50