L-Tyrosine, N-acetyl-3,5-diamino-O-(4-methoxyphenyl)-, ethyl ester

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2020

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

GLP compliance:

no

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

ethyl (2S)-3-[3,5-diamino-4-(4-methoxyphenoxy)phenyl]-2-acetamidopropanoate

Cas Number:

440667-78-7

Molecular formula:

C20H25N3O5

IUPAC Name:

ethyl (2S)-3-[3,5-diamino-4-(4-methoxyphenoxy)phenyl]-2-acetamidopropanoate

Test material form:

solid: particulate/powder

Results and discussion

Water solubility

Key result

Water solubility:

0.288 g/L

Conc. based on:

test mat.

Loading of aqueous phase:

100 mg/L

Temp.:

20 °C

pH:

>= 5 - <= 6

Details on results:

Seven vessels (blank, flasks 1C (for the sampling point 72 h) and flasks 2 – 6) were set onto the shaking apparatus immediately and shaking was started. After 24 ± 2 hours, flask 1B (for the sampling point 48 h) and after 48 ± 2 hours, flask 1A (for the sampling point 24 h) were set on the shaker and all flasks were shaken for further 24 ± 2 hours at room temperature.
Then, the blank and flasks 1A-C were taken from the shaker and tempered to 20.0 ± 0.5 °C. Samples were taken, membrane filtrated with PTFE filters 0.45 µm pore size and pre-pared for HPLC analysis (see chapter 4.6.3).
Because of a difference of less than 15 % in the concentrations on days 2 and 3 and no upward tendency, the test was finished on day 3. The final measurement of flasks 2 – 6 was performed on day 4 for organizational reasons.
All filtrated test solutions showed no Tyndall effect (i.e. a laser beam was not scattered when transmitted through the liquid).

Applicant's summary and conclusion

Conclusions:

The solubility of L-Tyrosine, N-acetyl-3,5-diamino-O-(4-methoxyphenyl)-, ethyl ester in wa-ter was determined from the measured concentrations of test item in the filtered test item solutions.
Equilibration time can be considered as approx. 1 day, as the values which were measured on the following consecutive days did not give significantly different values.
All replicates showed good correspondence. The mean test item concentration of the sam-ples (flask 2 - 6), which were used for the calculation of water solubility (at plateau) was 0.288 ± 0.006 g/L (mean ± standard deviation), corresponding to a relative standard devia-tion of 2.2 %.

No observations arousing doubts concerning the accuracy of the results and the validity of the study were made.