Registration Dossier

Administrative data

Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
11 February 2011 – 30 May 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: This study has been performed according to OECD and EC guidelines and in compliance with GLP principles.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report date:
2011

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
Version / remarks:
(1995)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.8 (Partition Coefficient)
Version / remarks:
(Official Journal of the European Union no. L142, May 31, 2008)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
shake-flask method to: flask method
Partition coefficient type:
octanol-water

Test material

Constituent 1
Reference substance name:
E-BK105
IUPAC Name:
E-BK105
Details on test material:
- Name of test material (as cited in study report): E-BK105
- Description: Black powder
- Batch: MB-1
- Test substance storage: At room temperature protected from light
- Stability under storage conditions: Stable
- Expiry date: 23 December 2015

Study design

Analytical method:
high-performance liquid chromatography

Results and discussion

Partition coefficientopen allclose all
Type:
Pow
Partition coefficient:
< 0
Temp.:
20.1 °C
pH:
7.1
Type:
log Pow
Partition coefficient:
< -4.2
Temp.:
20.1 °C
pH:
7.1
Details on results:
The log Pow values were within the criterion range of ± 0.3 log units.

A small peak was detected in the pretreated water samples from the blank mixture. The maximum contribution to the samples was 0.4%.

Any other information on results incl. tables

The results of the shake flask method are given in the Table below:

Main study – Pow of the test substance

Ratio

n-octanol : buffer pH 7

 

[v:v]

Analysed concentration

Pow 

Log Pow

pH

n-octanol

[g/l]

buffer pH 7

[g/l]

individual

1:1

 

 1:2

 

 

2:1

< 5.8 x 10-5

< 5.8 x 10-5

 

< 5.8 x 10-5

< 5.8 x 10-5

 

< 5.8 x 10-5

< 5.8 x 10-5

0.682

0.677

 

0.515

0.514

1.00

1.04

< 8.56 x 10-5

< 8.56 x 10-5

 

< 1.12 x 10-4

< 1.15 x 10-4

 

< 5.80 x 10-5

< 5.71 x 10-5

< -4.1

< -4.1

 

< -3.9

< -3.9

 

< -4.2

< -4.2

7.1

7.1

 

7.1

7.1

 

7.1

7.1

The results on the recoveries of the test substance in the test samples are given in the Table below. The analysed concentration of the stock solution was 2.10 g/l. Based on this the nominal quantity of the test substance in the test samples was 4.20 mg.

Recoveries

Ratio

n-octanol : buffer pH 7

 

[v:v]

Analysed quantity

Recovery

 

 

[%]

n-octanol

[mg]

buffer pH 7

[mg]

Total

[mg]

1:1

 

 

1:2

 

 

2:1

< 0.0003

< 0.0004

 

< 0.0002

< 0.0002

 

< 0.0005

< 0.0005

4.09

4.06

 

4.12

4.11

 

4.01

4.15

4.09

4.07

 

4.12

4.11

 

4.01

4.15

97

97

 

98

98

 

96

99

Applicant's summary and conclusion

Conclusions:
The shake flask method was applied for the determination of the partition coefficient (Pow) of E-BK105. The Pow value of the test substance at neutral pH and 20°C was < 5.71 10^-5, which corresponds with a log Pow value of < -4.2.