Octadecanamide, N-[(1S,2S,3R)-2,3-dihydroxy-1-(hydroxymethyl)heptadecyl]-

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-04-21 to 2017-10-26

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

adopted on 27 July 1995

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

Council Regulation (EC) No 440/2008; May 30th 2008

GLP compliance:

no

Type of method:

other: thermogravimetry and differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

Ceramide III

IUPAC Name:

Ceramide III

Test material form:

solid: particulate/powder

Specific details on test material used for the study:

The physical state of the test item at 20 °C and 101.3 kPa is a white, crystalline solid. All analyses included in this report have been performed with a batch, which passed the quality control measurements without any irregularity previously. All specifications were met.

Results and discussion

Boiling point

Key result

Decomposition:

yes

Decomp. temp.:

> 240 °C

Remarks on result:

other: The recorded weight loss above 340.6 °C may indicate a beginning evaporation (boiling). Based on visual inspection and the DSC test, where the test item showed a significant change of the melting behaviour, a product decomposition is more likely.

Any other information on results incl. tables

Results

Capillary method 

The thermic behaviour of Ceramide III was tested with a boiling point capillary from room temperature up to 300 °C with a heating rate of 10 °C/min. Arising bubbles were observed from approx. 190 °C. Finally, after cooling, the content of the tube appeared coloured and brownish.

DSC / TGA

As preliminary tests first TGA and DSC runs were performed. As the substance was obviously modified within the first heating period to 250 °C, the DSC main test was focussed on the melting behaviour.

Evaluation 

In the TGA test, a sample of the test item was heated from 30 °C to 675 °C in an inert gas atmosphere (nitrogen). The main drop was detected beginning at 340.6 °C (onset). Up to 460 °C a total weight loss of 99.9 % was recorded.

The recorded main weight loss above 340.6 °C (estimated onset on TGA) may indicate a beginning evaporation (boiling). However, based on the visual inspection and the results of the DSC preliminary test (up to 250 °C) where the test item showed a significant change of the melting behaviour (change of the melting point from 126.2 °C to < 80 °C (peak top)) a product decomposition is more likely.  

In order to provide evidence for this assumption, a degradation test was performed during which an aliquot of the sample was heated to 240 °C for 15 minutes. The remaining residue (98.1 % of the original material) was characterised by NMR spectroscopy. The NMR analysis confirms the decomposition of the product. Less than 50 % of the original material were detected after heating. Consequently, the test item does not provide a boiling point until disintegration at about 240 °C.

Applicant's summary and conclusion

Conclusions:

The test item does not provide a boiling point until disintegration at about 240 °C.

Executive summary:

The boiling point of Ceramide III was determined according to OECD Guideline 103 (27 July 1995) and EU Method A.2 (30 May 2008) using differential scanning calorimetry, thermogravimetry, NMR analysis and visual inspection.

In the TGA test, a sample of the test item was heated from 30 °C to 675 °C. The main drop was detected beginning at 340.6 °C (onset). Up to 460 °C a total weight loss of 99.9 % was recorded.

The recorded main weight loss above 340.6 °C (estimated onset on TGA) may indicate a beginning evaporation (boiling). However, based on the visual inspection and the results of the DSC preliminary test (up to 250 °C) where the test item showed a significant change of the melting behaviour (change of the melting point from 126.2 °C to < 80 °C (peak top)) a product decomposition is more likely. 

In order to provide evidence for this assumption, a degradation test was performed during which an aliquot of the sample was heated to 240 °C for 15 minutes. The remaining residue (98.1 % of the original material) war characterised by NMR spectroscopy. The NMR analysis confirmed the decomposition of the product. Less than 50 % of the original Ceramide III material were detected after heating. Consequently, Ceramide III does not provide a boiling point until disintegration at about 240 °C.

Boiling point of Ceramide III: no boiling point, but decomposition > 240 °C.