Panthenol , DL-form

Endpoint summary

Description of key information

Skin irritation was derived from read across approach with the supporting substances DL-Ethylpanthenol and D-Panthenol. None of these two substances showed skin irritation when applied to the rabbit skin. Eye Irritation was derived from read across approach with the supporting substances DL-Ethylpanthenol and D-Panthenol. None of these two substances showed eye irritation when applied to the rabbit eye. 

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

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

Adequacy of study:

key study

Study period:

from 1994-08-09 to 1994-08-12

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

This study followed the procedures indicated by internationally accepted guidelines and recommendations as Commission Regulation (EC) No 440/2008 (B.4: Acute Toxicity: Dermal Irritation / Corrosion). For justification of read across please refer to the attachment in IUCLID5 section 13.

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

Version / remarks:

directive 92/69/EEC

Deviations:

no

Principles of method if other than guideline:

NA

GLP compliance:

yes

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Broekman Institute, Someren, The Netherlands
- Age at study initiation: a pprox. 12 weeks
- Weight at study initiation: 2026 - 2195 grams
- Housing: Individually in labelled cages with perforated floors and equipped with an automatic drinking system
- Diet: Standard laboratory rabbit diet (LKK-20, pellet diameter 4mm, Hope Farms, Woerden, The Netherlands) approx. 100 gram per day.
- Water: Free access to tap-water diluted with decalcified water.
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature: 21 °C
- Humidity: 50 % rel. humidity
- Air changes: approximately 15 air changes per hour
- Photoperiod: 12 hours artificial fluorescent light and 12 hours dark per day.

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

The amount of test substance dose was 0.5 mL per animal.

Duration of treatment / exposure:

4 hours

Observation period:

72 hours

Number of animals:

3

Details on study design:

TEST SITE
- Area of exposure: surgical gauze patch of 2x3 cm
- Type of wrap if used: patches were mounted on Micropore tape which was wrapped around the abdomen and secured with Coban elastic bandage.

REMOVAL OF TEST SUBSTANCE
- Washing: Four hours after the application, the dressing was removed and the remaining test substance removed using a tissue moistened with tap-water and subsequently a dry tissue

SCORING SYSTEM: As stated in the guidelines
TEST SITE
- Area of exposure: 2 x 3 cm
- % coverage: 100
- Type of wrap: semi-occlusive

REMOVAL OF TEST SUBSTANCE
- Washing: with tissue moistened with tap water
- Time after start of exposure: 4 hours

SCORING SYSTEM:
- according to the guidelines

Irritation parameter:

erythema score

Basis:

mean

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

edema score

Basis:

mean

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

edema score

Basis:

animal #1

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

edema score

Basis:

animal #2

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

edema score

Basis:

animal #3

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritant / corrosive response data:

- no skin irritation after 4 hours
- no evidence of a corrosive effect

Other effects:

Colouration: No staining of the treated skin by the test substance was observed.
Toxicity symptoms/Mortality: No symptoms of systemic toxicity were observed in the animals during the test period and no mortality occurred.

no remarks

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

DL-Ethylpanthenol was considered not irritating to the rabbit skin.

Executive summary:

The test item DL-Ethylpanthenol was tested for skin irritation/corrosion to the intact rabbit skin in a test with three New Zealand White albino rabbits according to OECD guideline 404/EU method B.4 and under GLP.

0.5 mL of the test substance was applied to the intact skin of the shaved area on one flank on the shaved skin of the animals. The test area was wrapped with surgical tape. After 4 hours the wrapping was removed, the remaining test substance washed off and the application site observed for any signs of irritation/corrosion for 72 hours. No skin irritation was caused by DL-Ethylpanthenol after 4 hours of exposure in any of the three rabbits. There was no evidence of a corrosive effect on the skin. No staining of the treated skin by the test substance was observed. No symptoms of systemic toxicity were observed in the animals during the test period and no mortality occurred.

According to the results obtained in this study, DL-Ethylpanthenol was considered not irritating to the rabbit skin.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vivo

Type of information:

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

Adequacy of study:

key study

Study period:

from 1994-08-15 to 1994-08-29

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

This study followed the procedures indicated by internationally accepted guidelines and recommendations as Commission Regulation (EC) No 440/2008 (B.5: Acute Toxicity: Eye Irritation / Corrosion)). For justification of read across please refer to the attachment in IUCLID5 section 13.

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

directive 92/69/EEC

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Version / remarks:

24 February 1987

Deviations:

no

GLP compliance:

yes

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Broekman Institute, Someren, The Netherlands.
- Age at study initiation: approx. 14 weeks
- Weight at study initiation: 2516 - 2885 grams
- Housing: individually in labelled cages with perforated floors and equipped with an automatic drinking system (ITL, Bergen, The Netherlands)
- Diet: standard laboratory rabbit diet (LKK-20, pellet diameter 4 mm, Hope Farms, Woerden, The Netherlands) approx. 100 g per day
- Water: free access to tap-water diluted with decalcified water
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature: 21 °C
- Humidity: 50 % rel. humidity
- Air changes: approximately 15 air changes per hour
- Photoperiod: 12 hours artificial fluorescent light and 12 hours dark per day

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

Amount of test substance: 0.1 mL

Duration of treatment / exposure:

After 24 hour observation, the eyes of the test animals were treated with a solution of 2 % fluorescein in water to quantitatively determine corneal epithelial damage.

Observation period (in vivo):

14 days

Number of animals or in vitro replicates:

3 males

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing: no

SCORING SYSTEM:
- according to the guidelines

TOOL USED TO ASSESS SCORE:
- fluorescein

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

mean

Time point:

other: 24/48/72 h

Score:

1.5

Max. score:

3

Reversibility:

fully reversible within: 7 - 14 days

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #1

Time point:

other: 24/48/72 h

Score:

2

Max. score:

3

Reversibility:

fully reversible within: 7 days

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #2

Time point:

other: 24/48/72 h

Score:

1.3

Max. score:

3

Reversibility:

fully reversible within: 7 days

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #3

Time point:

other: 24/48/72 h

Score:

1.3

Max. score:

3

Reversibility:

fully reversible within: 14 days

Irritation parameter:

chemosis score

Basis:

mean

Time point:

other: 24/48/72 h

Score:

0.9

Max. score:

4

Reversibility:

fully reversible within: 72 h

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

other: 24/48/72

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 72 h

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

other: 24/48/72

Score:

0.7

Max. score:

4

Reversibility:

fully reversible within: 72 h

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

other: 24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 72 h

Irritation parameter:

cornea opacity score

Basis:

mean

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

cornea opacity score

Basis:

animal #1

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

cornea opacity score

Basis:

animal #2

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

cornea opacity score

Basis:

animal #3

Time point:

other: 24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

iris score

Basis:

mean

Time point:

other: 24/48/72 h

Score:

0

Max. score:

2

Irritation parameter:

iris score

Basis:

animal #1

Time point:

other: 24/48/72 h

Score:

0

Max. score:

2

Irritation parameter:

iris score

Basis:

animal #2

Time point:

other: 24/48/72 h

Score:

0

Max. score:

2

Irritation parameter:

iris score

Basis:

animal #3

Time point:

other: 24/48/72 h

Score:

0

Max. score:

2

Irritant / corrosive response data:

There was no evidence of ocular corrosion.

Other effects:

Colouration: No staining of peri-ocular tissues by the test substance was observed.
Toxic symptoms/Mortality: No symptoms of systemic toxicity were observed in the animals during the test period and no mortality occurred.

no remarks

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

Based on results obtained DL- ethyl panthenol is not classified as eye irritating

Executive summary:

DL-Ethylpanthenol was tested for eye irritation in a GLP study compliant to OECD 405/EU Method B.5.

Instillation of 0.1 ml of DL-Ethylpanthenol into one eye of each of the animals resulted in effects on the iris in two animals and on the conjunctivae in all three animals. Iridic irritation, grade 1, was observed on day 1 in the two animals and had resolved within 24 hours. The irritation of the conjunctivae consisted of redness and chemosis of the conjunctival tissues and discharge. The irritation had resolved completely within 7 days in two animals and within 14 days after instillation in the third animal. Treatment of the eyes with 2% fluorescein, 24 hours after test substance instillation revealed no corneal epithelial damage in any of the animals. There was no evidence of ocular corrosion. No staining of peri-ocular tissues by the test substance was observed.

DL-Ethylpanthenol was considered as not irritating to the rabbit eye.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin Irritation / corrosion

Skin irritation/corrosion for DL-Panthenol was derived from read across approach with the supporting substances DL-Ethylpanthenol and D-Panthenol. For justification of read across please refer to the attachment in IUCLID5 section 13.

The test item DL-Ethylpanthenol was tested for skin irritation/corrosion to the intact rabbit skin in a test with three New Zealand White albino rabbits according to OECD guideline 404/EU method B.4. 0.5 mL of the test substance was applied to the intact skin of the shaved area on one flank on the shaved skin of the animals. The test area was wrapped with surgical tape. After 4 hours the wrapping was removed, the remaining test substance washed off and the application site observed for any signs of irritation/corrosion for 72 hours. No skin irritation was caused by DL-Ethylpanthenol after 4 hours of exposure in any of the three rabbits. There was no evidence of a corrosive effect on the skin. No staining of the treated skin by the test substance was observed. No symptoms of systemic toxicity were observed in the animals during the test period and no mortality occurred. According to the results obtained in this study, DL-Ethylpanthenol was considered not irritating to the rabbit skin.

In the first supporting GLP and guideline study with a creme formulation containing 5 % (w/w) D-Panthenol the test item was found to cause a primary irritation score of 0.00 when applied to intact rabbit skin. Local signs (mean values from 1 hour to 72 hours) consisted of grade 0.00 erythema and grade 0.00 edema. No corrosive effect occurred on the skin of any animal at measuring interval. Based on the results of these tests, the substance has to be classified as not irritating to the skin. Based on the negative skin irritation test with DL-Ethyl Panthenol and supported by the negative skin irritation study with D- Panthenol as well as the long-term use of D-Panthenol in skin care products it can be concluded that DL-Panthenol is irritating to skin.

Eye Irritation

Eye irritation for DL-Panthenol was derived from read across approach with the supporting substances DL-Ethylpanthenol and D-Panthenol. For justification of read across please refer to the attachment in IUCLID5 section 13.

In the key study, Instillation of 0.1 ml of DL-Ethylpanthenol into one eye of each of the animals resulted in effects on the iris in two animals and on the conjunctivae in all three animals. Iridic irritation, grade 1, was observed on day 1 in the two animals and had resolved within 24 hours. The irritation of the conjunctivae consisted of redness and chemosis of the conjunctival tissues and discharge. The irritation had resolved completely within 7 days in two animals and within 14 days after instillation in the third animal. Treatment of the eyes with 2% fluorescein, 24 hours after test substance instillation revealed no corneal epithelial damage in any of the animals. There was no evidence of ocular corrosion. No staining of peri-ocular tissues by the test substance was observed.

DL-Ethylpanthenol was considered as not irritating to the rabbit eye.

In the first supporting GLP and guideline study with a creme formulation containing 5 % (w/w) D-Panthenol the test item was found to cause a primary irritation score of 0.00 when applied to the rabbit eye. No irritating effects occurred in the eyes of any animal at measuring interval. Due to the results of these studies and the close structural similarity between DL-Ethyl Panthenol and Panthenol it can be assumed that also undiluted DL- Panthenol is not irritating to the eye.

Justification for selection of skin irritation / corrosion endpoint:
The close structural similarity between DL-Ethyl Panthenol and Panthenol strongly suggest that DL- Panthenol is also not irritating to the skin. For justification of read across please refer to the attachment in IUCLID5 section 13.

Justification for selection of eye irritation endpoint:
The close structural similarity between DL-Ethyl Panthenol and Panthenol strongly suggest that DL- Panthenol is also not irritating to the eyes. For justification of read across please refer to the attachment in IUCLID5 section 13.

Justification for classification or non-classification

Based on the results obtained from testing of the supporting substances, DL-Panthenol was not classified and labeled according to Regulation (EC) No 1272/2008 (CLP) and Directive 67/548/EEC (DSD).