Disodium phthalate

Genetic toxicity: in vitro

Administrative data

Endpoint:

in vitro gene mutation study in bacteria

Remarks:

Type of genotoxicity: gene mutation

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

The substance CAS 15968-01-1 (disodium phthalate) is the sodium salt of the phthalic acid CAS 88-99-3. The main assumption is that sodium is not significant in respect of all the properties under consideration. In dilute aqueous conditions of defined pH a salt will behave no differently to the parent acid, at identical concentration of the particular speciated form present and will be fully dissociated. Therefore, the results obtained with the substance CAS 88-99-3 can be used for the read-across approach.

Data source

Reference

Reference Type:

other: read-across

Title:

Unnamed

Year:

2012

Materials and methods

Principles of method if other than guideline:

Read-across approach from data on an analogue.

GLP compliance:

not specified

Type of assay:

bacterial reverse mutation assay

Test material

Test material information

Constituent 1

Reference substance name:

Phthalic acid

EC Number:

201-873-2

EC Name:

Phthalic acid

Cas Number:

88-99-3

IUPAC Name:

phthalic acid

Details on test material:

- Molecular formula (if other than submission substance): C8H6O4
- Molecular weight (if other than submission substance): 166.1308
- Smiles notation (if other than submission substance): OC(=O)c1ccccc1C(=O)O
- InChl (if other than submission substance): InChI=1/C8H6O4/c9-7(10)5-3-1-2-4-6(5)8(11)12/h1-4H,(H,9,10)(H,11,12)
- Structural formula attached as image file (if other than submission substance): see Fig.

Results and discussion

Test results

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

not specified

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Any other information on results incl. tables

The substance CAS 15968-01-1 (disodium phthalate) is the sodium salt of the phthalic acid CAS 88-99-3. The main assumption is that sodium is not significant in respect of all the properties under consideration. Therefore, the results obtained with the substance CAS 88-99-3 can be used for the read-across approach.

As indicated in the European Chemical Agency Practical Guide 6 “How to report read –across and categories”, the structural grouping was realized using “OECD QSAR APPLICATION TOOL BOX” (see attachment).

Table 1: Data Matrix, Analogue Approach

CAS Number		88-99-3	15968-01-1
CHEMICAL NAME		Analogue Phthalic acid	Target chemical Disodium phthalate
PHYSICO-CHEMICAL DATA
Melting Point		Experimental results: 230 ºC	Experimental results: No evidence of melting point below 400 ºC. Decompositionin the range of 450 to 500 °C.
Boiling Point		Experimental results: Decomposes	No determination of boiling point is required since there was no evidence of melting below 400 ºC.
Density		Experimental results: 1.593 g/cm3 at 15 ºC	Experimental results: 1.67 at 20.8 ºC
Vapour Pressure		Experimental results: 8.48 x 10-5 Pa at 25 ºC	Experimental results: < 3.9 x 10 -5 Pa at 25 ºC
Partition Coefficient (log Kow)		Experimental results: 0.73	Experimental results: -2.34 at 20.1 ºC (pH 5.5)
Water solubility		Experimental results: 6250-7010 mg/L at 25 ºC	Experimental results: In the range of 45.8 to 47.9% w/w at 20 ºC.
ENVIRONMENTAL FATE and PATHWAY
Aerobic Biodegradation		Estimated data: Readily biodegradable (BIOWIN v4.10)	Estimated data: Readily biodegradable (BIOWIN v4.10)
Anaerobic Biodegradation		No data	No data
ENVIRONMENTAL TOXICITY
Acute Toxicity to Fish		No data	No data
Acute Toxicity to Aquatic Invertebrates		No data	No data
Toxicity to Aquatic Plants		No data	No data
MAMMALIAN TOXICITY
Acute Oral		Experimental results: LD50 = 2530 mg/kg (mouse)	Read-across: LD50 = 3200 mg/kg (mouse)
Acute Inhalation		No data	No data
Acute Dermal		No data	Experimental results: LD50 > 2000 mg/kg
Skin irritation / Eye irritation		No data	Experimental results: Not a skin irritant. Not an eye irritant.
Skin sensitisation		No data	Experimental results: Non-sensitising.
Repeated Dose		No data	No data
Genetic Toxicity in vitro	Gene mutation in bacteria	Experimental results: Negative	Read-across: Negative
	Chromosomal aberration	Experimental results: Negative	Experimental results: Negative
	Mammalian gene mutation	No data	Experimental results: Negative
Genetic Toxicity in vivo		Experimental results: Negative	Read-across: Negative
Carcinogenicity		No data	No data
Reproductive Toxicity: developmental toxicity		Developmental toxicity: No evidence of developmental toxicity. NOAEL, maternal toxicity= 1021 mg/kg bw/day; NOAEL, developmental toxicity= 1763 mg/kg bw/day	Read-across: No evidence of developmental toxicity. NOAEL, maternal toxicity= 1291 mg/kg bw/day; NOAEL, developmental toxicity= 2230 mg/kg bw/day

Applicant's summary and conclusion

Conclusions:

Interpretation of results (migrated information):
negative

Based on experimental data, the read-across approach is applied and the substance is considered as negative for the bacterial reverse mutation assay.

Executive summary:

The substance CAS 15968-01-1 (disodium phthalate) is the sodium salt of the phthalic acid CAS 88-99-3. The main assumption is that sodium is not significant in respect of all the properties under consideration. In dilute aqueous conditions of defined pH a salt will behave no differently to the parent acid, at identical concentration of the particular speciated form present and will be fully dissociated. Therefore, the results obtained with the substance CAS 88-99-3 can be used for the read-across approach.

Based on experimental data, the read-across approach is applied and the substance is considered as negative for the bacterial reverse mutation assay.