5-potassium hydrogen L-glutamate

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Administrative data

Endpoint:

relative self-ignition temperature (solids)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2021

Report date:

2021

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.16 (Relative Self-Ignition Temperature for Solids)

Version / remarks:

1

Deviations:

not specified

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

1

Reference substance name:

5-potassium hydrogen L-glutamate

EC Number:

243-094-0

EC Name:

5-potassium hydrogen L-glutamate

Cas Number:

19473-49-5

Molecular formula:

C5H9NO4.K

IUPAC Name:

potassium 5-oxido-5-oxo-L-norvaline

Test material form:

solid

Results and discussion

Relative self-ignition temperature (solids)

Key result

Remarks on result:

no self-ignition observed up to the melting point

Applicant's summary and conclusion

Conclusions:

L-glutamic acid monopotassium salt monohydrate has not got the relative self-ignition temperature in accordance with test EC A.16 criteria.

Executive summary:

L-glutamic acid monopotassium salt monohydrate has not got the relative self-ignition temperature in accordance with test EC A.16 criteria.

Relative self-ignition temperature was performed according to Standard Operating Procedure No. SPO/BC/12/b (edition 5) which corresponds to method ECA.16 Relative self-ignition temperature for solids[1].

The method is to place 8 cm³of the solid substance in the oven at room temperature;
the temperature / time curve relating to condition in the centre of the sample is recorded while the temperature of the oven is increased to, or to the melting point if lower, at a rate of 0.5 °C/min. For the purpose of this test, the temperature of the oven at which the sample temperature reachesby self-heating is called the self-ignition temperature.

A cube of stainless steel wire mesh withopenings was filled with the substance (about 8 cm³) to be tested and tapped gently, adding more of the substance until the cube was completely filled. Then the cube was suspended in the centre of the laboratory oven (volume about) at room temperature. One thermocouple was placed at the centre of the cube and the other between the cube and the oven wall to record the oven temperature.

The temperatures of the oven and sample were continuously recorded while the temperature
of the oven was increased to, or to the melting point if lower, at a rate of
0.5 °C/min.

Figure 1 shows the graph with the result of determination of relative self-ignition temperature.

Figure 1. Temperature versus time curve – determination of the relative self-ignition temperature.

On the graph temperature versus time there are two thermal changes of the sample temperature. The thermal changes, between approx. 100 °C – 150 °C and approx.
180 °C – 220 °C, can indicate a melting of the substance. which suggests the self-ignition phenomena of test item is not occurred.

On the graph temperature versus time there is not observed any thermal change of sample above. It means the self-ignition phenomena of test item is not occurred.