butyl 4-hydroxybenzoate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

28-Jan-2016 to 29-Jan-2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

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 (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Isobutyl 4-hydroxybenzoate

EC Number:

224-208-8

EC Name:

Isobutyl 4-hydroxybenzoate

Cas Number:

4247-02-3

Molecular formula:

C11H14O3

IUPAC Name:

isobutyl 4-hydroxybenzoate

Test animals / tissue source

Species:

cattle

Strain:

other: bovine eye

Details on test animals or tissues and environmental conditions:

n.a., in vitro study

Test system

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent no treatment

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 364 to 431 mg per cornea

NEGATIVE CONTROL
- Amount(s) applied (volume or weight with unit): 750 µl of physiological saline per cornea

POSITIVE CONTROL
Amount(s) applied (volume or weight with unit): 750 µl per cornea
Concentration (if solution): 20% (w/v) Imidazole

Duration of treatment / exposure:

240 minutes

Observation period (in vivo):

n.a.

Duration of post- treatment incubation (in vitro):

none

Number of animals or in vitro replicates:

3

Details on study design:

TEST SITE
- Isolated bovine cornea

REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes
- Time after start of exposure: 240 minutes

SCORING SYSTEM:
- After exposure the cornea is thoroughly rinsed to remove the test substance followed by immediate opacity measurement and permeability evaluation of the cornea.

- The mean opacity and mean permeability values (OD490) were used for each treatment group to calculate an in vitro score:

In vitro irritancy score (IVIS) = mean opacity value + (15 x mean OD490 value).


TOOL USED TO ASSESS SCORE:
- opacitymeter and microplate reader

DATA EVALUATION:
In vitro score range UN GHS
≤ 3 No Category
> 3; ≤ 55 No prediction can be made
>55 Category 1

Results and discussion

In vitro

Results

Irritation parameter:

in vitro irritation score

Remarks:

mean of 3 replicates

Run / experiment:

240 min

Value:

80

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

positive indication of irritation

Other effects / acceptance of results:

Isobutylparaben induced serious eye damage through both endpoints, resulting in a mean in vitro irritancy score of 80 after 240 minutes of treatment.

Applicant's summary and conclusion

Interpretation of results:

other: Eye Dam. 1 (H318) according to Regulation (EC) No 1272/2008

Conclusions:

Isobutyl 4-hydroxybenzoate is corrosive in the Bovine Corneal Opacity and Permeability test.

Executive summary:

The negative control responses of the opacity and permeability values were less than the upper limits of the laboratory historical range indicating that the negative control did not induce irritancy on the corneas.The mean in vitro irritancy score of the positive control (20% (w/v) Imidazole) was 137 and within the historical positive control data range. It was therefore concluded that the test conditions were adequate and that the test system functioned properly.

Isobutyl 4-hydroxybenzoate induced serious eye damage through both endpoints, resulting in a mean in vitro irritancy score of 80 after 240 minutes of treatment.