Amides, C12-18(even-numbered) and C18(unsatd.), N-hydroxyethyl

Partition coefficient

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From August 18, 2010 to August 27, 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 123 (Partition Coefficient (1-Octanol / Water), Slow-Stirring Method)

Deviations:

no

GLP compliance:

no

Type of method:

HPLC method

Partition coefficient type:

octanol-water

Analytical method:

high-performance liquid chromatography

Key result

Type:

log Pow

Partition coefficient:

ca. 4.3

Temp.:

25 °C

pH:

>= 7.36 - <= 7.44

Remarks on result:

other: RSD= 0.36 %

Key result

Type:

Pow

Partition coefficient:

ca. 18 498

Temp.:

25 °C

pH:

>= 7.36 - <= 7.44

Remarks on result:

other: RSD= 2.8 %

Details on results:

For details on the results, please refer to 'attached background material'.

Annotation: According to the applied guideline the slow-stirring method is particularly suitable for the determination of substances with expected log Pow values of 5 and higher, for which the shake-flask method (generally applicable from log Pow = -2 to 4) is prone to yield erroneous results.

However, according to the REACH Guidance on information requirements and chemical safety assessment - Chapter R.7a: Endpoint specific guidance, the shake-flask method is not recommended for surfactants. Instead, the slow-stirring method is advised as the preferred test method in this case.

Conclusions:

Under the study conditions, the partition coefficient (log Pow) was determined to be 4.3 at 25°C.

Executive summary:

A study was conducted to determine the partition coefficient of the test substance, C12-18 and C18-unsatd. MEA (purity not specified), according to OECD Guideline 123. The concentration of the test substance in the water and 1 -octanol phase was determined after 14, 16, 18 and 20 h, ensuring that an equilibrium concentration was established in both phases. At each test time, the three different test solutions were analyzed. The logarithm of the ratio of the concentration of the test material in 1-octanol and water (log (Co/Cw)) was calculated for each sampling time. The resulting mean values for the different test solutions were used for the determination of partition coefficients. Under the study conditions, the partition coefficient (log Pow) was determined to be 4.3 at 25°C (Frischmann, 2010).

Reference 2

Endpoint:

partition coefficient

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

QSAR prediction from a well-known and acknowledged tool. See below under ''attached background material section' for QPRF containing methodology and domain evaluation details.

Qualifier:

according to guideline

Guideline:

other: REACH guidance on QSARs: Chapter R.6. QSARs and grouping of chemicals

Principles of method if other than guideline:

The partition coefficient (log Kow) value for the test substance were estimated using the KOWWIN v.1.68. program in EPI SuiteTM v4.11. Since the test substance is a UVCB, the log Kow values were predicted for the individual constituents using SMILES codes as the input parameter.

Type of method:

other: Fragment constant method

Partition coefficient type:

other: QSAR prediction

Key result

Type:

log Pow

Partition coefficient:

ca. 1.28 - ca. 6.19

Remarks on result:

other: predicted for the main constituents

Remarks:

KOWWIN v.1.68. EPI SuiteTM v4.11

Key result

Type:

log Pow

Partition coefficient:

ca. 3.86

Remarks on result:

other: weighted average Log Kow

Remarks:

KOWWIN v.1.68. EPI SuiteTM v4.11

Predicted value:

The predicted log Kow values for the different constituents using the fragment constant-based method were as follows:

Table 2: Log Kow predictions: Fragment constant-based method

Constituents/Carbon chain length*	Mean/adjusted conc	Mole fraction Xi = (mi/Mi)/∑ (mi/Mi)	Log Kow	Log Kow * xi	Domain evaluation
C8	1.5	0.02095	1.28	0.026747784	MW, Structural fragment (ID)
C10	1.5	0.01822	2.26	0.041178837	MW, Structural fragment (ID)
C12	52.5	0.56423	3.24	1.828103055	MW, Structural fragment (ID)
C14	20	0.19273	4.22	0.813301722	MW, Structural fragment (ID)
C16	10	0.08734	5.21	0.455029955	MW, Structural fragment (ID)
C18	1.5	0.01198	6.19	0.074146411	MW, Structural fragment (ID)
C18'	11	0.08839	5.97	0.527669204	MW, Structural fragment (ID)
C18''	2	0.01617	5.76	0.093143046	MW, Structural fragment (ID)
			Log Kow=	3.86

*Glycerol or MEA residues have not been considered for the QSAR prediction

Log Kow prediction results:

          Log Kow(version 1.69 estimate): 1.28

 

SMILES : CCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C10 H21 N1 O2

MOL WT : 187.28

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 8 | -CH2-  [aliphatic carbon]               | 0.4911 | 3.9288

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  1.2767

 

 

                 Log Kow(version 1.69 estimate): 2.26

 

SMILES : CCCCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C12 H25 N1 O2

MOL WT : 215.34

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 10 | -CH2-  [aliphatic carbon]               | 0.4911 | 4.9110

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  2.2589

 

 

                 Log Kow(version 1.69 estimate): 3.24

 

SMILES : CCCCCCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C14 H29 N1 O2

MOL WT : 243.39

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 12 | -CH2-  [aliphatic carbon]               | 0.4911 | 5.8932

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  3.2411

 

 

                 Log Kow(version 1.69 estimate): 4.22

 

SMILES : CCCCCCCCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C16 H33 N1 O2

MOL WT : 271.45

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 14 | -CH2-  [aliphatic carbon]               | 0.4911 | 6.8754

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  4.2233

 

 

 

                 Log Kow(version 1.69 estimate): 5.21

 

SMILES : CCCCCCCCCCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C18 H37 N1 O2

MOL WT : 299.50

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 16 | -CH2-  [aliphatic carbon]               | 0.4911 | 7.8576

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  5.2055

 

 

                 Log Kow(version 1.69 estimate): 6.19

 

SMILES : CCCCCCCCCCCCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C20 H41 N1 O2

MOL WT : 327.56

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 18 | -CH2-  [aliphatic carbon]               | 0.4911 | 8.8398

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  6.1877

 

 

                 Log Kow(version 1.69 estimate): 5.97

 

SMILES : CCCCCCCCC=CCCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C20 H39 N1 O2

MOL WT : 325.54

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 16 | -CH2-  [aliphatic carbon]               | 0.4911 | 7.8576

 Frag | 2 | =CH- or =C< [olefinc carbon]            | 0.3836 | 0.7672

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  5.9727

 

 

                 Log Kow(version 1.69 estimate): 5.76

 

SMILES : CCCCCC=CCC=CCCCCCCCC(=O)NCCO

CHEM  :

MOL FOR: C20 H37 N1 O2

MOL WT : 323.52

-------+-----+--------------------------------------------+---------+--------

 TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-----+--------------------------------------------+---------+--------

 Frag | 1 | -CH3   [aliphatic carbon]               | 0.5473 | 0.5473

 Frag | 14 | -CH2-  [aliphatic carbon]               | 0.4911 | 6.8754

 Frag | 4 | =CH- or =C< [olefinc carbon]            | 0.3836 | 1.5344

 Frag | 1 | -OH    [hydroxy, aliphatic attach]      |-1.4086 | -1.4086

 Frag | 1 | -NH-   [aliphatic attach]               |-1.4962 | -1.4962

 Frag | 1 | -C(=O)N [aliphatic attach]              |-0.5236 | -0.5236

 Const |    | Equation Constant                        |        | 0.2290

-------+-----+--------------------------------------------+---------+--------

                                                        Log Kow  =  5.7577

Conclusions:

Using the fragment constant method, of KOWWIN V.1.68 program of EPI SuiteTM, the weighted average partition coefficient (log Kow) value for test substance was predicted to be 3.86.

Executive summary:

The partition coefficient (log Kow) value for the test substance, C12-18 and C18-unsatd. MEA was predicted using the fragment constant method, of KOWWIN V.1.68 program. Since the test substance is a UVCB, the log Kow values were predicted for the individual constituents using SMILES codes as the input parameter. Using the fragment constant method, the log Kow values for the individual constituents of the test substance ranged from 1.28 to 6.19. All constituents meet the molecular weight and structural fragment descriptor domain criteria. Given that the constituents are structurally very similar and vary only in the carbon chain length, a weighted average value, which considers the percentage of the constituent in the substance, was considered to dampen the errors in predictions (if any). Therefore, the weighted average log Kow value was calculated as 3.86. Overall, considering either the individual log Kow predictions for the constituents or the weighted average values, the test substance is expected to be less hydrophobic with a good absorption and low accumulation potential. Therefore, the log Kow predictions for the test substance using KOWWIN v1.69 can be considered to be reliable with moderate confidence.

Reference 3

Endpoint:

partition coefficient

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

QSAR prediction from a well-known and acknowledged tool. See below under ''attached background material section' for QPRF containing methodology and domain evaluation details.

Qualifier:

according to guideline

Guideline:

other: REACH guidance on QSARs: Chapter R.6. QSARs and grouping of chemicals

Principles of method if other than guideline:

The partition coefficient (log Kow) value for the test substance were estimated using the group contributions methodology of Molinspiration (miLogP2.2 - November 2005). Since the test substance is a UVCB, the log Kow values were predicted for the individual constituents using SMILES codes as the input parameter.

Type of method:

other: Group contributions

Partition coefficient type:

other: QSAR prediction

Key result

Type:

log Pow

Partition coefficient:

ca. 2.25 - ca. 7.3

Remarks on result:

other: predicted for the main constituents

Remarks:

Molinspiration (miLogP2.2)

Key result

Type:

log Pow

Partition coefficient:

ca. 4.87

Remarks on result:

other: weighted average Log Kow

Remarks:

Molinspiration (miLogP2.2)

Predicted value:

Using the group contribution method of molinspiration model, the partition coefficient (Log Kow) values for the different constituents were predicted as follows:

Table 1: Log Kow predictions: group contribution-based method

Constituents/Carbon chain length*	Mean/adjusted conc	Mole fraction Xi = (mi/Mi)/∑ (mi/Mi)	Log Kow	Log Kow * xi
C8	1.5	0.02095	2.25	4.71E-02
C10	1.5	0.01822	3.26	5.94E-02
C12	52.5	0.56423	4.27	2.41E+00
C14	20	0.19273	5.28	1.02E+00
C16	10	0.08734	6.29	5.49E-01
C18	1.5	0.01198	7.3	8.74E-02
C18'	11	0.08839	6.81	6.02E-01
C18''	2	0.01617	6.09	9.85E-02
			Log Kow=	4.87

*Glycerol or MEA residues have not been considered for the QSAR prediction

Conclusions:

Using the group contribution method, of molinspiration (miLogP 2.2), the weighted average partition coefficient (log Kow) value for test substance was predicted to be 4.87.

Executive summary:

The partition coefficient (log Kow) value for the test substance, C12-18 and C18-unsatd. MEA was predicted using the group contribution method, of Molinspiration (miLogP 2.2) program. Since the test substance is a UVCB, the log Kow values were predicted for the individual constituents using SMILES codes as the input parameter. Using the group contribution method, the log Kow values for the individual constituents of the test substance ranged from 2.25 to 7.3. All constituents meet the molecular weight and log Kow descriptor domain criteria. Given that the constituents are structurally very similar and vary only in the carbon chain length, a weighted average value, which considers the percentage of the constituent in the substance, was considered to dampen the errors in predictions (if any). Therefore, the weighted average log Kow value was calculated as 4.87. Overall, considering either the individual log Kow predictions for the constituents or the weighted average values, the test substance is expected to be less hydrophobic with a good absorption and low accumulation potential. Therefore, the log Kow predictions for the test substance using Molinspiration (miLogP 2.2), can be considered to be reliable with moderate confidence.

Reference 4

Endpoint:

partition coefficient

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model, but not (completely) falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

QSAR prediction from a well-known and acknowledged tool. See below under ''attached background material section" for QPRF containing methodology and domain evaluation details.

Qualifier:

according to guideline

Guideline:

other: REACH guidance on QSARs: Chapter R.6. QSARs and grouping of chemicals

Principles of method if other than guideline:

The partition coefficient (log Kow) value for the test substance were estimated using the efficient partition algorithm (EPA) and associative neural network (ASNN) method of the ALOGPS v.2.1 program from the virtual computational chemistry laboratory. Since the test substance is a UVCB, the log Kow values were predicted for the individual constituents using SMILES codes as the input parameter.

Type of method:

other: Efficient Partition Algorithm (EPA) and Associative Neural Network (ASNN)

Partition coefficient type:

other: QSAR

Key result

Type:

log Pow

Partition coefficient:

ca. 1.43 - ca. 6.74

Remarks on result:

other: predicted for the main constituents

Remarks:

(ALOGPS v.2.1)

Key result

Type:

log Pow

Partition coefficient:

ca. 4.45

Remarks on result:

other: weighted average Log Kow

Remarks:

(ALOGPS v.2.1)

Predicted value:

The predicted Partition coefficient (Log Kow) values for the different constituents using the Efficient Partition Algorithm (EPA) and Associative Neural Network (ASNN) method were as follows:

Table 1: Log Kow predictions: EPA and ASNN based method

Constituents/Carbon chain length*	Mean/adjusted conc	Mole fraction Xi = (mi/Mi)/∑ (mi/Mi)	Log Kow	Log Kow * xi
C8	1.5	0.02095	1.43	0.029959529
C10	1.5	0.01822	2.71	0.049378163
C12	52.5	0.56423	3.8	2.144071484
C14	20	0.19273	4.93	0.950136846
C16	10	0.08734	5.74	0.501318991
C18	1.5	0.01198	6.67	0.079896052
C18'	11	0.08839	6.74	0.595727041
C18''	2	0.01617	6.26	0.10122838
			Log Kow=	4.45

*Glycerol or MEA residues have not been considered for the QSAR prediction

Conclusions:

Using the efficient partition algorithm and associative neural networks based regression equations from ALOGPS V.2.1, the weighted average Partition coefficient (log Kow) value for test substance was predicted to be 4.45.

Executive summary:

The partition coefficient (log Kow) value for the test substance, C8-18 and C18-unsatd. DEA was predicted using the EPA and ASNN based regression equations from ALOGPS V.2.1. Since the test substance is a UVCB, the log Kow values were predicted for the individual constituents using SMILES codes as the input parameter. Using the EPA and ASNN-based regression equations, the log Kow values for the individual constituents of the test substance ranged from 1.43 to 6.74. All constituents meet the E-indices, molecular weight and number of non-hydrogen atoms descriptor domain criteria. Further, given that the constituents are structurally very similar and vary only in the carbon chain length, a weighted average value, which considers the percentage of the constituent in the substance, was considered to dampen the errors in predictions (if any). Therefore, the weighted average log Kow value was calculated as 4.45. Overall, considering either the individual log Kow predictions for the constituents or the weighted average values, the test substance is expected to be less hydrophobic with a good absorption and low accumulation potential. Therefore, the log Kow predictions for the test substance using ALOGPS v.2.1 can be considered to be reliable with moderate confidence.

Description of key information

The partition coefficient was determined according to OECD Guideline 123 (Frischmann, 2010).

Weighted average partition coefficient values for the substance were also modelled using the fragment constant method of the KOWWIN V.1.68 program of EPI Suite, the group contribution method of Molinspiration (miLogP 2.2) and the efficient partition algorithm and associative neural network-based regression equations from ALOGPS V.2.1.

Key value for chemical safety assessment

Log Kow (Log Pow):

4.3

at the temperature of:

25 °C

Additional information

The measured log Kow was equivalent to 4.3.

Using the fragment constant method of the KOWWIN V.1.68 program of EPI Suite, the weighted average partition coefficient (log Kow) value for test substance was predicted to be 3.86. According to the group contribution method of Molinspiration (miLogP 2.2), the weighted average log Kow was 4.87. According to the efficient partition algorithm and associative neural network-based regression equations from ALOGPS V.2.1, the weighted average log Kow was 4.85.

The measured log Kow was retained as key value for risk assessment purposes.