Registration Dossier
Registration Dossier
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EC number: 201-739-3 | CAS number: 87-32-1
Boiling point
Administrative data
Link to relevant study record(s)
- Endpoint:
- boiling point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 09 Jul - 28 Aug 2015
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to other study
- Reason / purpose for cross-reference:
- reference to other study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 103 (Boiling point/boiling range)
- Version / remarks:
- adopted in 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.2 (Boiling Temperature)
- Version / remarks:
- adopted in 2008
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Specific details on test material used for the study:
- Storage conditions: ambient temperature (10 – 30 °C)
- Decomposition:
- yes
- Decomp. temp.:
- 208.6 °C
- Remarks on result:
- other: Test item melted under decomposition.
Reference
Results
DSC
Two DSC measurements showed an endothermal effect after the melting in
the temperature range of 230 – 325 °C. However, as the melting was
already accompanied by decomposition, it can be assumed that further
decomposition occurred and the observed endothermal effect could have
been either a gas development caused by the decomposition and/or partial
boiling of the test item/decomposition products. No further endothermic
nor exothermic effects were seen up to the final test temperature of 500
°C. The mass loss after DSC measurement was 67%.
Table 1 – Boiling point – DSC measurement
Test item [mg] |
Final temperature [°C] |
Temperature range (boiling) [°C] |
Onset [°C] |
Observations |
7.76 |
500 |
--- |
--- |
Mass loss 67% |
7.78 |
Mass loss 68% |
The test item N-Acetyl-LD-Tryptophan had no boiling point as it melted under decomposition.
Description of key information
Substance had no boiling point under atmospheric conditions (OECD 103, DSC).
Key value for chemical safety assessment
Additional information
Substance melted under decomposition starting at 208.6 °C.
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