Ethanol, 2-[(3-aminopyrazolo[1,5-a]pyridin-2-yl)oxy]-, hydrochloride (1:1)

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From September 28, 2010 to September 30, 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP study conducted in compliance with international guidelines.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

2-({3-aminopyrazolo[1,5-a]pyridin-2-yl}oxy)ethan-1-ol hydrochloride

EC Number:

695-745-7

Cas Number:

1079221-49-0

Molecular formula:

C9 H11 N3 O2, ClH

IUPAC Name:

2-({3-aminopyrazolo[1,5-a]pyridin-2-yl}oxy)ethan-1-ol hydrochloride

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Results and discussion

Water solubility

Water solubility:

> 584 g/L

Temp.:

22 °C

pH:

1.2

Remarks on result:

other: Only a water solubility above a concentration has been determined (upper limit not reached in the test).

Details on results:

After mixing a total of about 5 g of the test item in 5 mL of water and stirring for 1, 2, 4, 6 and 24 hours, respectively, a dark purple solution was obtained. Based on visual judgment the test item was completely dissolved. The pH of the supernatant solutions was determined to be 1.15 after 1 hour, 1.26 after 2 hours, 1.26 after 4 hours, 1.26 after 6 hours and 1.27 after 24 hours. The water solubility of test item was determined at 22°C to be higher than 584 g/L. The aqueous solutions have been quantified by HPLC with respect to a calibration curve. The r² fit was 0.9993 (optimum 1.0000). This reflects the linearity of the HPLC-system within the calibration range of 3.49 μg/mL to 104.70 μg/mL of the test item.

Any other information on results incl. tables

Results of the Water Solubility:

Initial Weight of Test Item (g)	Time (h)	Water added (mL)	Measured concentration (µg/L)	Dilution factor	Solubility in water (g/L)	Mean (g/L)
5,2	1	5	61,65	10000	616,5	628,9
5,27		5	64,13	10000	641,3
5,24	2	5	61,44	10000	614,4	653,7
5,45		5	69,29	10000	692,9
5,35	4	5	64,18	10000	641,8	651,8
5,24		5	66,18	10000	661,8
5,27	6	5	64,95	10000	649,5	644,1
5,38		5	63,87	10000	638,7
5,08	24	5	57,23	10000	572,3	584,1
5,31		5	59,59	10000	595,9

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information): very soluble (> 10000 mg/L)

Executive summary:

The determination of the water solubility of test item was performed according to the EEC Directive 92/69, A.6 “Water Solubility” (1992) and the OECD guideline No. 105, “Water Solubility” (adopted July 27, 1995), using a simplified flask method. After mixing a total of about 5 g of the test item in 5 mL of water and stirring for 1, 2, 4, 6 and 24 hours, respectively, a dark purple solution was obtained. Based on visual judgment the test item was completely dissolved. The pH of the supernatant solutions was determined to be 1.15 after 1 hour, 1.26 after 2 hours, 1.26 after 4 hours, 1.26 after 6 hours and 1.27 after 24 hours. The water solubility of test item was determined at 22°C to be higher than 584 g/L. The aqueous solutions have been quantified by HPLC with respect to a calibration curve.