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Administrative data

Endpoint:
skin sensitisation: in vivo (non-LLNA)
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
1985
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The study was read across from EDTMP-xNa (CAS 22036-77-7) conducted according to an appropriate guideline, but not in compliance with GLP.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1985
Report date:
1985

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: Buehler test
GLP compliance:
not specified
Type of study:
Buehler test

Test material

Constituent 1
Reference substance name:
EDTMP-xNa
IUPAC Name:
EDTMP-xNa
Constituent 2
Reference substance name:
[ethylenebis[nitrilobis(methylene)]]tetrakisphosphonic acid, sodium salt
EC Number:
244-742-5
EC Name:
[ethylenebis[nitrilobis(methylene)]]tetrakisphosphonic acid, sodium salt
Cas Number:
22036-77-7
IUPAC Name:
22036-77-7
Details on test material:
- Name of test material (as cited in study report): Dequest 2046

In vivo test system

Test animals

Species:
guinea pig
Strain:
Hartley
Sex:
male/female

Study design: in vivo (non-LLNA)

Inductionopen allclose all
Route:
epicutaneous, occlusive
Vehicle:
unchanged (no vehicle)
Concentration / amount:
100% test material. Positive control induction in 80% ethanol, rechallenge in acetone as vehicle (concentration not reported).
Challengeopen allclose all
Route:
epicutaneous, occlusive
Vehicle:
unchanged (no vehicle)
Concentration / amount:
100% test material. Positive control induction in 80% ethanol, rechallenge in acetone as vehicle (concentration not reported).
No. of animals per dose:
The positive control group and the test material group consisted of 5 males and 5 females, and these animals were treated during the induction and challenge phases of this study. A third group was included which consisted of 3 males and 3 females, and these animals were treated only during the challenge phase to assess whether the challenge concentration was irritating.
Details on study design:
During the induction phase, the test material was applied for 6 hours and the skin was wiped free of any excess material. The treatment was repeated once a week for three weeks, for a total of three exposures. After a two week rest period, animals were treated during the first challenge phase at a new site with no previous application of test material.
Challenge controls:
Yes
Positive control substance(s):
yes
Remarks:
DNCB

Results and discussion

In vivo (non-LLNA)

Resultsopen allclose all
Reading:
rechallenge
Group:
positive control
Dose level:
acetone as vehicle
No. with + reactions:
10
Total no. in group:
10
Clinical observations:
greater of the 24/48 hour score
Remarks on result:
other: Reading: rechallenge. Group: positive control. Dose level: acetone as vehicle. No with. + reactions: 10.0. Total no. in groups: 10.0. Clinical observations: greater of the 24/48 hour score.
Reading:
rechallenge
Group:
test chemical
Dose level:
100%
No. with + reactions:
0
Total no. in group:
10
Clinical observations:
24/48 hour reading
Remarks on result:
other: Reading: rechallenge. Group: test group. Dose level: 100%. No with. + reactions: 0.0. Total no. in groups: 10.0. Clinical observations: 24/48 hour reading.
Reading:
1st reading
Group:
other: challenge (irritation) control
Dose level:
100%
No. with + reactions:
0
Total no. in group:
6
Remarks on result:
other: Reading: 1st reading. Group: other: challenge (irritation) control. Dose level: 100%. No with. + reactions: 0.0. Total no. in groups: 6.0.

Any other information on results incl. tables

0.3 ml of the test material was applied at induction and challenge as a 100% solution.

Dequest 2046 is known to have 35.7% active salt content at pH 6 -8, and a specific gravity of 1.3 -1.36 g/ cm3.

The pKa of the salt at pH 7.3 is estimated to be 6. The conversion factor to determine the salt to acid equivalent for mass for EDTMP-6Na salt is 0.768.

Therefore, based on the known active salt proportion of the substance it is calculated that the at application to animal skin amount of active salt is 400 mg, and active acid 300 mg.

Applicant's summary and conclusion

Interpretation of results:
not sensitising
Remarks:
Migrated information Criteria used for interpretation of results: not specified
Conclusions:
The test material was found not sensitising in a Buehler test, conducted according to an appropriate test protocol but not in compliance with GLP.

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