α-d-Glucopyranoside, β-d-fructofuranosyl, benzoate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Nov 13th to Dec 1st 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

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)

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

α-d-Glucopyranoside, β-d-fructofuranosyl, benzoate

EC Number:

235-795-5

EC Name:

α-d-Glucopyranoside, β-d-fructofuranosyl, benzoate

Cas Number:

12738-64-6

Molecular formula:

C12-H22-O11.x-C7-H6-O2; x=5-8

IUPAC Name:

α-d-Glucopyranoside, β-d-fructofuranosyl, benzoate

Specific details on test material used for the study:

Name : MIRAMER SB
(α-d-Glucopyranoside, β-d-fructofuranosyl, benzoate)
Supplier : Miwon Specialty Chemical Co.,Ltd
KTR Code : TS-00832
Cas No. : 12738-64-6
Lot No. : 161228BO5
Purity : 100 %
Physical description : Flake (Solid)
Storage condition : Room temperature[(1 - 30)C°]

Test animals / tissue source

Species:

cattle

Details on test animals or tissues and environmental conditions:

Bovine eyes were collected by slaughterhouse on the day of slaughter and were transported in cooling condition. The information of bovine eyes was as the following:
Supplier : Hwajung-Food (Nonsan-si, Chungcheongnam-do, Korea)
Eyes excised date : 2017 - 11 - 16
Transfer condition : Cold (3.0 – 5.0) ℃
Number of arrived Eyes : 15 ea
Number of used cornea : 12 ea (3 ea/group)

Test system

Vehicle:

other: mineral oil

Controls:

yes, concurrent vehicle

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

20%

Duration of treatment / exposure:

The corneas were incubated in the presence of either the test substance, positive control, solvent control or negative control for 4 hours at (32 ± 1 C°) in an incubator.

Duration of post- treatment incubation (in vitro):

90 ± 5 minutes

Number of animals or in vitro replicates:

3 in each group (G1 : Negative control, G2 : Positive control, G3 : Solvent control, G4 : Test substance)

Details on study design:

SELECTION AND PREPARATION OF CORNEAS
The eyes, once they arrived at the laboratory, were grossly examined for damage (e.g., increased opacity, scratches, neovascularization and pigmentation) and those exhibiting defects were discarded in the laboratory. Corneas with a horizontal diameter ≥ 27.5 and ≤ 28.5 using vernier calipers (KG-EQM-429) was used in selected eyes.

Isolation of corneas : Selected eyes were stored in a dish containing 1X HBSS (containing penicillin/streptomycin solution) until all corneas were dissected. The cornea was dissected from eyes such that approximately 2 to 3 mm of sclera was present around the cornea. The isolated corneas were also re-stored in a dish containing 1X HBSS (containing penicillin/streptomycin solution) until all corneas were dissected.
The isolated corneas were mounted immediately in the corneal holders and then corneal holders were filled with cMEM (without phenol red). The holders were pre-incubated for 1 hour at (32 ± 1)℃ in an incubator

NUMBER OF REPLICATES
3

NEGATIVE CONTROL USED
Name : Sodium Chloride 0.9% solution
Manufacturer : Sigma-Aldrich Corporation
Lot. No. : RNBD7305
Justification for selection : This negative control was recommended as guidelinesand used as negative control in BCOP assay widely.

SOLVENT CONTROL USED
Name : Mineral oil
Manufacturer : Sigma-Aldrich Corporation
Lot. No. : MKCB0402V
Justification for selection : Test substance had insolubility in water. Mineral oil had no adverse effects on the bovine cornea in solvent test. So mineral oil was used as solvent with the sponsor`s consent.

POSITIVE CONTROL USED
Name : Imidazole
Manufacturer : Sigma-Aldrich Corporation
Lot. No. : SLBH9399V
Justification for selection : This positive control was recommended as guidelines in case of non-surfactant solid test substances.

APPLICATION DOSE AND EXPOSURE TIME
The corneas were incubated in the presence of either the test substance, positive control, solvent control or negative control for 4 hours at (32 ± 1)C° in an incubator.

POST-INCUBATION PERIOD:


REMOVAL OF TEST SUBSTANCE
- Number of washing steps after exposure period: After 4 hours of exposure time, the negative control, solvent control, positive control and test substance were removed. The corneas were washed more than three times with cMEM (with phenol red). The corneas were then given a final rinse with cMEM (without phenol red) and replaced with cMEM (without phenol red) in anterior and posterior chamber of holder.
- POST-EXPOSURE INCUBATION: The corneas were incubated for 90 ± 5 minutes at (32 ± 1)C° in an incubator.

METHODS FOR MEASURED ENDPOINTS:
- Corneal opacity: Final opacity unit was calculated according to the following formula: (I0/I-0.9894)/0.0251 where I0 is the illuminance(lux) through the reference holder, and I is the illuminance through the cornea holder
- Corneal permeability: At the end of the 90 ± 5 minutes incubation, the medium was collected from the posterior chamber of holder on a per cornea basis. Absorbance value of medium at 490 nm was measured using 96-well microtiter plate reader (KG-EQM-412). The medium volume in the 96 well plate was 300 uL/well and each media were filled in 3 wells in the 96 well plate. cMEM (without phenol red) was used as Blank.

SCORING SYSTEM: In Vitro Irritancy Score (IVIS)

Results and discussion

In vitro

Results

Irritation parameter:

cornea opacity score

Value:

<= 3

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Based on the observed results it was concluded, that MIRAMER SB was considered as a ‘UN GHS Category : No Category’ in the Bovine Corneal Opacity and PermeabilityTest (BCOP Test) under the test conditions chosen. The test subtsance Miramer SB (sucrose benzoate) is therefore not irritating to the eye.

Executive summary:

The purpose of this study was to evaluate the potential ocular irritancy/toxicity of a test substance MIRAMER SB as measured by the MIRAMER SB’s effect to induced opacity and permeability to fluorescein in an isolated bovine cornea. The test substance was administered to the test system as a 20 % solution (w/v in mineral oil) according to the OECD guideline. Mineral oil as solvent was selected by sponsor’s consent. The test results were as in the following: - Corneal opacity was measured quantitatively as the amount of light transmission through the cornea. The mean opacity value of test substance group was 0.8 ± 1.0 (opacity unit). The mean opacity value of negative control, solvent control and positive control were –0.3 ± 1.2, 0.5 ± 0.5 and 56.6 ± 11.9 respectively. The mean opacity value of the test substance relative to the solvent control group was 0.4 ± 1.2. - Permeability was measured quantitatively as the amount of sodium fluorescein dye that passes across the full thickness of the cornea by optical density. The mean OD490 value of test substance group was 0.013 ± 0.002. The mean OD490 value of negative control, solvent control and positive control were 0.005 ± 0.001, 0.011 ± 0.006 and 1.774 ± 0.428 respectively. The mean OD490 value of test substance relative to the solvent control group was 0.002 ± 0.002. - Both opacity and permeability were used to calculate an In Vitro Irritancy Score (IVIS) of the test substance relative to the negative control corneas. As a result of calculating the IVIS, test substance group was calculated as 1.0 ± 1.0. The IVIS of negative control, solvent control and positive control were –0.2 ± 1.2, 0.6 ± 0.6 and 83.2 ± 9.0 respectively. The IVIS of the test substance relative to the solvent control was 0.4 ± 1.0. The test result was considered acceptable that the IVIS of positive control falls within two standard deviations of the current historical mean.

Based on the observed results it was concluded, that MIRAMER SB was considered as a ‘UN GHS Category : No Category’ in the Bovine Corneal Opacity and PermeabilityTest (BCOP Test) under the test conditions chosen. The test subtsance Miramer SB (sucrose benzoate)is therefore not irritating to the eye.