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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2021
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2021
Report date:
2021

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Partition coefficient type:
octanol-water

Test material

Constituent 1
Chemical structure
Reference substance name:
5-oxo-L-proline, compound with L-arginine (1:1)
EC Number:
260-081-5
EC Name:
5-oxo-L-proline, compound with L-arginine (1:1)
Cas Number:
56265-06-6
Molecular formula:
C6H14N4O2.C5H7NO3
IUPAC Name:
5-oxo-L-proline, compound with L-arginine (1:1)
Test material form:
liquid

Study design

Analytical method:
liquid chromatography

Results and discussion

Partition coefficient
Key result
Type:
log Pow
Partition coefficient:
< -1.72
Temp.:
22 °C
pH:
8.77

Applicant's summary and conclusion

Conclusions:
The value of the LogP of L-pirrolidone carboxylic acid was found to be < -1.72. L-pirrolidone carboxylic acid has got a pKa = 3.4, it means that all moleculars of L-pirrolidone carboxylic acid have formed a complex with arginine to obtain Arginine PCA, so we can conclude that the value of the LogP or arginine PCA can be evaluated to be < -1.72.
Executive summary:

The LogP of the test item was measued according to the OECD 107 method. The value of the LogP of L-pirrolidone carboxylic acid was found to be < -1.72.  L-pirrolidone carboxylic acid has got a pKa = 3.4, it means that all moleculars of L-pirrolidone carboxylic acid have formed a complex with arginine to obtain Arginine PCA, so we can conclude that the value of the LogP or arginine PCA can be evaluated to be < -1.72.