Guanidinium phosphate (1:1)

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14JAN2013 to 24JAN2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.2400 (Acute Eye Irritation)

Deviations:

no

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: Japanese Ministry of Agriculture, Forestry and Fisheries (JMAFF), 2011, including the most recent partial revisions.

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Guanidinium phosphate (1:1)

EC Number:

226-551-9

EC Name:

Guanidinium phosphate (1:1)

Cas Number:

5423-22-3

Molecular formula:

CH8N3O4P

IUPAC Name:

(diazaniumylmethylidene)azanium phosphate

Test material form:

solid: crystalline

Details on test material:

- Name of test material (as cited in study report): Guanidine phosphate (1:1)
- Physical state: White crystal solid
- CAS no.: 5423-22-3
- Storage condition of test material: In refrigerator (2-8°C) in the dark in well-sealed container
- pH: 5 at concentration of 50%

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

- Source: Charles River France, L’Arbresle Cedex, France
- Age at study initiation: Animals used withihn the study were 13-15 weeks old
- Weight at study initiation: Body weights were 2.471-2.916 kg
- Housing: Individually housed in cages with perforated floors
- Diet: Free access to pelleted diet for rabbits (Global Diet 2030 Harlan Teklad, Italy). Hay and wooden sticks were available during the study period
- Water: Free access to tap water
- Acclimation period: At least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18 – 24
- Humidity (%): 40 - 70
- Air changes (per hr): approx 15
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 14JAN2013 to 24JAN2013

Test system

Vehicle:

water

Controls:

other: One eye of each animal remained untreated and served as the reference control.

Amount / concentration applied:

TEST MATERIAL- Amount(s) applied (volume or weight with unit):
67.3 mg (range 67.1 – 67.5 mg); a volume of approximately 0.1 mL

Duration of treatment / exposure:

Single instillation on Day 1.

Observation period (in vivo):

The eyes of each animal were examined approximately 1, 24, 48 and 72 hours and 7, 14 and 21 days after instillation of the test substance .

Number of animals or in vitro replicates:

3 males

Details on study design:

STUDY DESIGN
The study was performed in a stepwise manner and was started by treatment of a single rabbit (sentinel). The two other animals were treated in a similar manner one week later, after considering the degree of eye irritation observed in the first animal.

TREATMENT
Animals were treated by instillation of the test substance in the conjunctival sac of one of the eyes after gently pulling the lower lid away from the eyeball. The lids were then gently held together for about one second to prevent loss of the test substance. The other eye remained untreated and served as the reference control.
Immediately after the 24-hour observation, a solution of 2% fluorescein (Merck, Darmstadt, Germany) in water (adjusted to pH 7.0) was instilled into both eyes of each animal to quantitatively determine corneal epithelial damage. Any bright green stained area, indicating epithelial damage, was estimated as a percentage of the total corneal area.

After the final observation, the animals were sacrificed by intra-venous injection of Euthasol® 20%.

REMOVAL OF TEST SUBSTANCE
-Washing: No

OBSERVATIONS (beschrijf beperkt)
- Mortality/Viability: Twice daily.
- Toxicity: At least once daily.
- Body Weight: Day of treatment (prior to instillation) and after the final observation.
- Necropsy: No necropsy was performed according to protocol.
- Irritation: The eyes of each animal were examined approximately 1, 24, 48 and 72 hours after instillation of the test substance. The irritation scores and a description of all other (local) effects were recorded. The irritation was assessed according to the scoring system as described in OECD guideline 405.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Remarks:

(opacity)

Basis:

mean

Remarks:

of three animals

Time point:

other: 24, 48 and 72 hrs.

Score:

0

Max. score:

4

Remarks on result:

other: No effects on the cornea were observed.

Results 2

Irritation parameter:

iris score

Basis:

mean

Remarks:

of three animals

Time point:

other: 24, 48 and 72 hrs.

Score:

0

Max. score:

2

Remarks on result:

other: No effects on the iris were observed.

Results 3

Irritation parameter:

conjunctivae score

Remarks:

(redness)

Basis:

mean

Remarks:

of three animals

Time point:

other: 24, 48 and 72 hrs.

Score:

0.7

Max. score:

3

Reversibility:

fully reversible within: 72 hours

Results 4

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

of three animals

Time point:

other: 24, 48 and 72 hrs.

Score:

0.11

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Results 5

Irritation parameter:

conjunctivae score

Remarks:

(discharge)

Basis:

mean

Remarks:

of three animals

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

3

Remarks on result:

other: No discharge was observed.

Irritant / corrosive response data:

Instillation of approximately 67 mg of Guanidine phosphate (1:1) (a volume of approximately 0.1 mL) into one eye of each of three rabbits resulted in irritation of the conjunctivae, which consisted of redness, chemosis and discharge. The irritation had completely resolved within 48 hours in one animal and within 72 hours in the other two animals.
No iridial irritation or corneal opacity were observed, and treatment of the eyes with 2% fluorescein 24 hours after test substance instillation revealed no corneal epithelial damage.
There was no evidence of ocular corrosion.

Other effects:

No staining of (peri) ocular tissues by the test substance was observed and no test substance remnants were seen.

No symptoms of systemic toxicity were observed in the animals during the test period and no mortality occurred.

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

In an eye irritation study with rabbits, performed according to OECD/EC test guidelines, limited irritation was observed.

Executive summary:

An eye irritation study was performed with rabbits, performed according to OECD/EC test guidelines. Approximately 67.3mg Guanidinium phosphate (1:1) in a volume of approximately 0.1 mL was instilled in one eye of each of the three rabbits. This resulted in irritation of the conjunctivae, consisting of redness, chemosis and discharge. The irritation had completely resolved within 48 hours in one animal and within 72 hours in the other two animals. No iridial irritation or corneal opacity were observed, and treatment of the eyes with 2% fluorescein 24 hours after test substance instillation revealed no corneal epithelial damage. There was no evidence of ocular corrosion.

No symptoms of systemic toxicity were observed in the animals during the test period and no mortality occurred. Based on these data, guanidinium phosphate is considered not to be irritating to the eye and is not classified according to Regulation (EC) 1272/2008.