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Diss Factsheets

Administrative data

acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
20 October 1998 to 03 November 1998
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference Type:
study report
Report date:

Materials and methods

Test guidelineopen allclose all
according to guideline
EU Method B.1 (Acute Toxicity (Oral))
according to guideline
OECD Guideline 401 (Acute Oral Toxicity)
GLP compliance:
Test type:
standard acute method
Limit test:

Test material

Constituent 1
Chemical structure
Reference substance name:
EC Number:
EC Name:
Molecular formula:
Hill formula: C18H15N3Na2O9S3 CAS formula: C18H17N3Na2O9S3.2Na
Disodium 4-amino-3-[(4-{[2-(sulfonatooxy)ethyl]sulfonyl}phenyl)diazenyl]naphthalene-1-sulfonate
Test material form:
solid: particulate/powder
microgranulate or well dedusted powder
Details on test material:
Name: Reaktiv-Orange DYPR 1410

Test animals

Details on test animals or test system and environmental conditions:
Species: Sprague Dawley rat
Strain: HSD: Sprague Dawley SO
Origin: HARLAN WINKELMANN Gartenstr. 27, 33178 Borchen SPF breeding colony
Body weight at start of study: male animals: mean = 196g (=100%)
s = ±5.8g
min = 190g (-3.1%)
max = 205g (+4.6%)
n = 5
female animals: mean = 180g (=100%)
s = ±6.2g
min = 170g (-5.6%)
max = 187g (+3.9%)
n = 5
Age at the start of the study: 6 – 10 weeks
Randomization: Randomization schemes 93,0603 and 93,0702
Animal maintenance: in fully air-conditioned rooms in macrolon cages (type 4) on soft wood granulate in groups of 5 animals
Room temperature: 22 ± 3⁰C
Relative humidity: 50 + 20%
Lighting time: 12 hours daily
Acclimatization: at least seven days
Food: ssniff* R/M-H (V 1534), ad libitum
Withdrawal of food: from about 16 hours before to 3 - 4 hours after treatment
Water: tap water in plastic bottles, ad libitum
Animal identification: fur marking with KMnOj and cage numbering

Administration / exposure

Route of administration:
oral: gavage
Details on oral exposure:
Test groups
The animals received the compound as a 20 % solution in deionised water, the administration volume being 10 ml/kg body weight.

If no compound-related mortality is produced in this limit test according to the guidelines no full study has to be carried out

Preparation of the test compound
Reaktiv-Orange DYPR 1410 was dissolved in the stated concentration in deionised water and distributed homogeneously by means of a magnetic stirrer.

The stability and the homogeneity of the test substance in the vehicle was determined by analytical methods.
The acute oral toxicity of Reaktiv-Orange DYPR 1410 was tested only at a dose level of 2000 mg/kg body weight.
No. of animals per sex per dose:
Male 5
Female 5
Control animals:
Details on study design:
The prepared test substance was administered by gavage to fasted animals at the stated dosage. The observation period following treatment fasted for 14 days. Symptoms were recorded twice every day (in the morning and in the afternoon), on weekends and public holidays only once. During this time the animals were weighed weekly. At the end of the observation period the animals were killed by carbon dioxide asphyxiation, dissected and examined for macroscopically visible changes.
Not reported.

Results and discussion

Preliminary study:
Not applicable
Effect levels
Dose descriptor:
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
No deaths occurred during the whole study.
Clinical signs:
other: No symptoms were observed after administration of 2000 mg/kg body weight.
Gross pathology:
The animals killed at the end of the observation period showed no macroscopically visible changes.
Other findings:
Only reddish discolored feces were observed in some male and female animals after the administration of Reaktiv-Orange DYPR 1410, At day two of the study all clinical signs were reversible.

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Based on the results obtained in this study the median lethal dose value (LD50) of Reaktiv-Orange DYPR 1410 for the male and female rat is greater than 2000 mg/kg body weight.
Executive summary:

A study to assess the acute toxic effects of the test item was conducted in compliance with EEC-Guideline B,1. "Acute Oral Toxicity" of the Directive 92/69/EEC and OECD Guidelines for Testing of Chemicals, 401 “Acute Oral Toxicity”. This study was conducted in compliance with the Principles of Good Laboratory Practice (GLP).

No lethality occurred after administration of 2000 mg/kg body weight. Only reddish discoloured faeces were observed in same male and female animals. At day two of the study all clinical signs were reversible. With exception of one female, which suffered a loss of weight between day 8 and day 15, the body weight of all surviving animals increased during the observation period. The animals killed at the end of the observation period showed no macroscopically visible changes.

Acute oral toxicity testing of Reaktiv-Orange DYPR 1410 in the rat yielded a median lethal dose (LD50) above 2000 mg/kg body weight in both male and female animals. The substance is not classified as acutely harmful by oral exposure.