Registration Dossier

Administrative data

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28 March - 01 June 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report Date:
2017

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
from 27 July 1995
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
impurity
Test material form:
solid: crystalline
Remarks:
crystalline powder
Details on test material:
Batch No: 11679700
Storage: at room temperature, protected from light

Results and discussion

Melting / freezing point
Key result
Atm. press.:
>= 1 009.4 - <= 1 010.7 hPa
Decomposition:
yes
Decomp. temp.:
ca. 178 °C
Remarks on result:
other: Melting of the test item was not observed below the temperature of decomposition, therefore the test item has no melting temperature.

Any other information on results incl. tables

In the temperature range of 100 – 190 °C, an endothermic effect was observed, which cannot be clearly assigned to the melting of the test item. The endothermic effect was directly followed by an exothermic effect in the temperature range of 190 – 220 °C, with a maximum decomposition energy of -80 J/g. No further thermal effects were observed up to the test end temperature of 500 °C.

No.

Sample weight / mg

Onset of Effect / °C

Range of effect / °C

Weight loss / mg

Atmospheric pressure / hPa

 PN13120

 17.58

168.64

-

100 - 190 (endo)

 190 - 220 (exo)

16.94 

 1010.7

 PN13182

 9.16

149.81

-

100 - 190 (endo)

190 - 220 (exo)

 3.47

 1009.4

To verify the results of the DSC measurement, two additional measurements with the capillary method was performed in the temperature range of 40 - 250 °C with a heating rate of 10 K/min. According to the observations during the test with the capillary method, the first endothermic effect in the temperature range of 100 – 190 °C in the DSC measurements cannot be assigned to the melting of the test item. The test item changed its colour from white to brown starting at a temperature of approx. 178 °C. At a temperature of 184 °C the test item decomposes and expands throughout the capillary. Due to this result, the test item has no melting point before its decomposition starting at a temperature of about 178 °C.

Applicant's summary and conclusion

Conclusions:
The test item Adenosine-5'-monophosphate (AMP) (CAS no. 61-19-8) has no melting point up to its decomposition starting at a temperature of approx. 178 °C at atmospheric pressure (1010 hPa) as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).
Executive summary:

The test item Adenosine-5'-monophosphate (AMP) (CAS no. 61-19-8) has no melting point up to its decomposition starting at a temperature of approx. 178 °C at atmospheric pressure (1010 hPa) as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).