Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
pH
Type of information:
other: peer-reviewed data
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: peer-reviewed data from handbook or collection of data

Data source

Reference
Reference Type:
review article or handbook
Title:
L-Tryptophan
Author:
HSDB
Year:
2004
Bibliographic source:
Hazardous Substances Data Bank, http://csi.micromedex.com

Materials and methods

Principles of method if other than guideline:
In the peer-reviewed data bank, the pH of a L-tryptophan solution is reported.
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
L-tryptophan
EC Number:
200-795-6
EC Name:
L-tryptophan
Cas Number:
73-22-3
Molecular formula:
C11H12N2O2
IUPAC Name:
L-tryptophan

Results and discussion

pH value
pH value:
5.5 - 7
Temp.:
25 °C
Concentration:
1 g/L

Applicant's summary and conclusion

Conclusions:
The pH of a 1% aqueous solution of L-tryptophan is in the range between 5.5 and 7.
Executive summary:

In the peer-reviewed data bank, the pH of a 1% aqueous solution of L-tryptophan is reported to be in the range between 5.5 and 7.