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EC number: 628-907-2 | CAS number: 26661-13-2
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Skin irritation / corrosion
Administrative data
- Endpoint:
- skin irritation: in vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- Experimental start date: 27 November 2012. Experimental end date: 04 December 2012
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 013
- Report date:
- 2013
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- N4-Benzoylcytosine
- EC Number:
- 628-907-2
- Cas Number:
- 26661-13-2
- Molecular formula:
- C11H9N3O2
- IUPAC Name:
- N4-Benzoylcytosine
Constituent 1
- Specific details on test material used for the study:
- Sponsor's identification: N-Benzoyl Cytosine
Description: off white powder
Batch number: NBC-5-11001
Purity: not supplied
Date received: 09 July 2012
Expiry date: not supplied
Storage conditions: room temperature in the dark over silica gel
Test animals
- Species:
- rabbit
- Strain:
- New Zealand White
- Details on test animals or test system and environmental conditions:
- Animals and Animal Husbandry
Three New Zealand White (Hsdlf:NZW) strain rabbits were supplied by Harlan Laboratories UK Ltd., Leicestershire, UK. At the start of the study the animals weighed 2.55 to 2.70 kg and were twelve to twenty weeks old. After an acclimatisation period of at least five days each animal was given a number unique within the study which was written with a black indelible marker-pen on the inner surface of the ear and on the cage label.
The animals were individually housed in suspended cages. Free access to mains drinking water and food (2930C Teklad Global Certified Rabbit diet supplied by Harlan Laboratories UK Ltd., Oxon, UK) was allowed throughout the study. The diet and drinking water were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.
The temperature and relative humidity were set to achieve limits of 17 to 23°C and 30 to 70% respectively. Any occasional deviations from these targets were considered not to have affected the purpose or integrity of the study. The rate of air exchange was at least fifteen changes per hour and the lighting was controlled by a time switch to give twelve hours continuous light (06:00 to 18:00) and twelve hours darkness.
The animals were provided with environmental enrichment items which were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.
Test system
- Type of coverage:
- semiocclusive
- Preparation of test site:
- clipped
- Vehicle:
- unchanged (no vehicle)
- Controls:
- no
- Amount / concentration applied:
- For the purpose of the study the test item was used as supplied. The absorption of the test item was not determined.
0.5 g of the test item, moistened sufficiently with 0.5 ml of distilled water - Duration of treatment / exposure:
- 4 hours
- Observation period:
- 72 hours
- Number of animals:
- 3 males
- Details on study design:
- On the day before the test each of a group of three rabbits was clipped free of fur from the dorsal/flank area using veterinary clippers. Only animals with a healthy intact epidermis by gross observation were selected for the study.
On the day of the test a suitable test site was selected on the back of each rabbit. At each test site a quantity of 0.5 g of the test item, moistened sufficiently with 0.5 ml of distilled water, was introduced under a 2.5 cm x 2.5 cm cotton gauze patch. The patch was secured in position with a strip of surgical adhesive tape. To prevent the animals interfering with the patches, the trunk of each rabbit was wrapped in an elasticated corset and the animals were returned to their cages for the duration of the exposure period.
Four hours after application the corset and patches were removed from each animal and any residual test item removed by gentle swabbing with cotton wool soaked in distilled water.
Immediately following removal of the patches and approximately 1, 24, 48 and 72 hours later, the test sites were examined for evidence of primary irritation and scored according to the following scale:
EVALUATION OF SKIN REACTIONS
Erythema and Eschar Formation Value
No erythema 0
Very slight erythema (barely perceptible) 1
Well-defined erythema 2
Moderate to severe erythema 3
Severe erythema (beef redness) to eschar
formation preventing grading of erythema 4
Oedema Formation
No oedema 0
Very slight oedema (barely perceptible) 1
Slight oedema (edges of area well-defined
by definite raising) 2
Moderate oedema (raised approximately
1 millimetre) 3
Severe oedema (raised more than 1 millimetre
and extending beyond the area of exposure) 4
Any other skin reactions and clinical signs of toxicity, if present, were also recorded.
An additional observation was made on Day 7 to assess the reversibility of skin reactions.
Individual bodyweights were recorded on Day 0 (the day of dosing) and at the end of the observation period.
Results and discussion
In vivo
Resultsopen allclose all
- Irritation parameter:
- erythema score
- Basis:
- animal #1
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 1
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- probability of weak irritation
- Irritation parameter:
- erythema score
- Basis:
- animal #2
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 1
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- probability of weak irritation
- Irritation parameter:
- erythema score
- Basis:
- animal #3
- Time point:
- 24/48/72 h
- Score:
- 1
- Max. score:
- 1
- Reversibility:
- fully reversible within: 7 days
- Remarks on result:
- probability of weak irritation
- Irritation parameter:
- edema score
- Basis:
- animal #1
- Time point:
- 24/48/72 h
- Score:
- 0
- Max. score:
- 0
- Remarks on result:
- no indication of irritation
- Irritation parameter:
- edema score
- Basis:
- animal #2
- Time point:
- 24/48/72 h
- Score:
- 0
- Max. score:
- 0
- Remarks on result:
- no indication of irritation
- Irritation parameter:
- edema score
- Basis:
- animal #3
- Time point:
- 24/48/72 h
- Score:
- 0
- Max. score:
- 0
- Remarks on result:
- no indication of irritation
- Irritant / corrosive response data:
- Skin Reactions
Very slight erythema was noted at all treated skin sites at the 24, 48 and 72-Hour observations.
All treated skin sites appeared normal at the 7-Day observation.
Bodyweight
All animals showed expected gain in bodyweight during the study.
Any other information on results incl. tables
Individual Skin Reactions
Skin Reaction | Observation Time (following patch removal) |
Individual Scores — Rabbit Number and Sex | Total | ||
72739 Male | 72740 Male | 72741 Male | |||
Erythema/Eschar Formation |
Immediately | 0 | 0 | 0 | [0] |
1 hour | 0 | 0 | 0 | [0] | |
24 hours | 1 | 1 | 1 | 3 | |
48 hours | 1 | 1 | 1 | 3 | |
72 hours | 1 | 1 | 1 | 3 | |
7 days | 0 | 0 | 0 | [0] | |
Oedema Formation |
Immediately | 0 | 0 | 0 | [0] |
1 hour | 0 | 0 | 0 | [0] | |
24 hours | 0 | 0 | 0 | 0 | |
48 hours | 0 | 0 | 0 | 0 | |
72 hours | 0 | 0 | 0 | 0 | |
7 days | 0 | 0 | 0 | [0] |
Applicant's summary and conclusion
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- The test item produced a mean erythema value of 1 and mean oedema value of 0 as such was not classified as irritant to rabbit skin according to CLP. No corrosive effects were noted.
- Executive summary:
Introduction
The study was performed to assess the irritancy potential of the test itemto the skin of the New Zealand White rabbit. The method was designed to be compatiblewith the following:
OECD Guidelines for the Testing of Chemicals No. 404 "Acute Dermal Irritation/Corrosion" (adopted 24 April 2002)
Method B4 Acute Toxicity (Skin Irritation) of Commission Regulation (EC)No. 440/2008
Results
A single 4-Hour, semi-occluded application of the test item to the intact skin of three rabbits produced very slight erythema. All treated skin sites appeared normal at the 7-Day observation.
Conclusion
The test item produced a mean erythema value of 1 and mean oedema value of 0 as such was not classified as irritant to rabbit skin according to CLP. No corrosive effects were noted.
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