Phosphoric acid, mono- and dimethyl esters, compds. with C10-13-(branched)-alkylaniline

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22 February 2018 to 19 September 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU method B.47 (Bovine corneal opacity and permeability test method for identifying ocular corrosives and severe irritants)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Phosphoric acid, monomethyl ester, compd. with 4-tetrapropylenebenzenamine (1:1)

Molecular formula:

C19H36NO4P

IUPAC Name:

Phosphoric acid, monomethyl ester, compd. with 4-tetrapropylenebenzenamine (1:1)

Constituent 2

Reference substance name:

Dimethyl hydrogen phosphorate, compound with 4-tetrapropyleneaniline

EC Number:

269-016-5

EC Name:

Dimethyl hydrogen phosphorate, compound with 4-tetrapropyleneaniline

Cas Number:

68170-22-9

Molecular formula:

C20H38NO4P

Test material form:

liquid: viscous

Specific details on test material used for the study:

- CAS RN 1412893-77-6
- Purity: >94% (UVCB)
- Description: Brown paste to very viscous liquid

Test animals / tissue source

Species:

cattle

Strain:

not specified

Details on test animals or tissues and environmental conditions:

Eyes from adult cattle (typically 12 to 60 months old) were obtained from a local abattoir as a by-product from freshly slaughtered animals. The eyes were excised by an abattoir employee after slaughter, and were placed in Hanks’ Balanced Salt Solution (HBSS) supplemented with antibiotics (penicillin at 100 IU/mL and streptomycin at 100 µg/mL). They were transported to the test facility over ice packs on the same day of slaughter. The corneas were prepared immediately on arrival.

Test system

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

0.75 mL of the test material or control items were applied to the appropriate corneas

Duration of treatment / exposure:

Each holder was incubated, anterior chamber uppermost, at 32 ± 1 ºC for 10 minutes

Duration of post- treatment incubation (in vitro):

120 minutes

Number of animals or in vitro replicates:

Three

Details on study design:

Preparation of Corneas
The cornea from each selected eye was removed leaving a 2 to 3 mm rim of sclera to facilitate handling. The iris and lens were peeled away from the cornea. The isolated corneas were immersed in a dish containing HBSS until they were mounted in Bovine Corneal Opacity and Permeability (BCOP) holders.

The anterior and posterior chambers of each BCOP holder were filled with complete Eagle’s Minimum Essential Medium (EMEM) without phenol red and plugged. The holders were incubated at 32 ± 1 ºC for 60 minutes. At the end of the incubation period each cornea was examined for defects. Only corneas free of damage were used.

Treatment of Corneas
The EMEM was removed from the anterior chamber of the BCOP holder and 0.75 mL of the test item or control items were applied to the appropriate corneas. The holders were gently tilted back and forth to ensure a uniform application of the item over the entire cornea. Each holder was incubated, anterior chamber uppermost, at 32 ± 1 ºC for 10 minutes.

At the end of the exposure period the test item and control items were removed from the anterior chamber and the cornea was rinsed 3 times with fresh complete EMEM containing phenol red before a final rinse with complete EMEM without phenol red. The anterior chamber was refilled with fresh complete EMEM without phenol red. A post treatment opacity reading was taken and each cornea was visually observed.

The holders were incubated, anterior chamber facing forward, at 32 ± 1 ºC for 120 minutes.
After incubation the holders were removed from the incubator, the medium from both chambers was replaced with fresh complete EMEM and a final opacity reading was taken. Each cornea was visually observed.

Application of Sodium Fluorescein
Following the final opacity measurement the permeability of the corneas to sodium fluorescein was evaluated. The medium from the anterior chamber was removed and replaced with 1 mL of sodium fluorescein solution (4 mg/mL). The dosing holes were plugged and the holders incubated, anterior chamber uppermost, at 32 ± 1 ºC for 90 minutes.

Permeability Determinations
After incubation the medium in the posterior chamber of each holder was decanted and retained.

360 µL of media representing each cornea was dispensed into the appropriate wells of a pre labeled 96 well plate. The optical density was measured (quantitative viability analysis) at 492 nm (without a reference filter) using the Labtech LT-4500 microplate reader.

Results and discussion

In vitro

Results

Irritation parameter:

in vitro irritation score

Run / experiment:

1

Value:

31

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

Corneal Epithelium Condition
The corneas treated with the test material were cloudy post treatment and post incubation. The corneas treated with the negative control item were clear post treatment and post incubation. The corneas treated with the positive control item were cloudy post treatment and post incubation.

Criteria for an Acceptable Test
The positive control (Neat Ethanol) In Vitro Irritancy Score was within the historical range of 29.6 to 65.1. The positive control acceptance criterion was therefore satisfied.

The negative control (0.9% (w/v) Sodium Chloride) gave opacity of ≤2.3 and permeability ≤0.041. The negative control acceptance criteria were therefore satisfied.

Test Material
The in vitro irritancy score of the test material was 31, based on this result, no prediction of eye irritation can be made for the test material.

Any other information on results incl. tables

The In Vitro irritancy scores are summarized as follows:

Treatment	In VitroIrritancy Score
Test Item*	31.0
0.9% (w/v) Sodium Chloride (Negative Control)	0.1
Neat Ethanol (Positive Control)	61.4

Note: * Phosphoric acid, methyl ester, compds. with branched dodecylbenzenamine (CAS RN 1412893-77-6)

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Based on the results of the BCOP test, no prediction of eye irritation can be made for the test item according to UN GHS or EU CLP.

Executive summary:

In a study performed to the standardized guidelines OECD 437 and EU Test Method B.47., under GLP conditions, the undiluted test item was applied for 10 minutes followed by an incubation period of 120 minutes. Negative (0.9% (w/v) Sodium Chloride) and positive (Neat Ethanol) control items were tested concurrently. The two endpoints, decreased light transmission through the cornea (opacity) and increased passage of sodium fluorescein dye through the cornea (permeability) were combined in an empirically derived formula to generate an In Vitro Irritancy Score (IVIS) of 31. Based on the results of the BCOP test, no prediction of eye irritation can be made for the test item according to UN GHS or EU CLP.