2-(cyclohexylamino)ethanesulphonic acid

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-10-04 to 2016-10-20

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

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Version / remarks:

17 December 2001

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

Version / remarks:

30 May 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

2-(cyclohexylamino)ethanesulphonic acid

EC Number:

203-115-6

EC Name:

2-(cyclohexylamino)ethanesulphonic acid

Cas Number:

103-47-9

Molecular formula:

C8H17NO3S

IUPAC Name:

2-(cyclohexylamino)ethanesulphonic acid

Test material form:

solid: particulate/powder

Test animals

Species:

rat

Strain:

Wistar

Remarks:

Crl:WI

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: TOXI COOP ZRT. Cserkesz u. 90., 1103 Budapest, Hungary
- Females nulliparous and non-pregnant: yes
- Age at study initiation: 8 weeks
- Weight at study initiation: 198 - 204 g
- Fasting period before study: 1 day (water was available), food was returned 3 h after treatment
- Housing: group caging (3 rats/cage)
- Diet: ad libitum, ssniff® SM R/M-Z+H complete diet for rats and mice (ssniff Spezialdiäten GmbH, D-59494 Soest Germany)
- Water: ad libitum, tap water
- Acclimation period: 5-6 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22+/-3
- Humidity (%): 30 - 70
- Air changes (per hr): above 10
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

VEHICLE
- Concentration in vehicle: 200 mg/mL
- Amount of vehicle: 10 mL/kg bw
- Justification for choice of vehicle: standard vehicle
- Purity: aqua purificata Ph.Hg. VIII. from Parma Produkt Kft. (Batch no. 1606-5508)

MAXIMUM DOSE VOLUME APPLIED: 10 mL

CLASS METHOD
- Rationale for the selection of the starting dose: The starting dose was selected on the basis of the available information about the test item and similar substances.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

6 females (3 per group)

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Animals were observed individually after dosing at least once during the first 30 minutes, then 1 h, 2 h, 3 h, 4 h after the treatment and twice each day for 14 days thereafter. The body weights were recorded on day 0 (just before the treatment), on day 7 and on day 15 with a precision of 1 g.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, external appearance, appearance of tissue and organs of cranial, thoracic and abdominal cavities
- Experimental design: The study was performed in two consecutive steps with three rats per step.

Statistics:

not applicable

Results and discussion

Effect levels

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No death occurred at 2000 mg/kg bw single oral dose of the test item. All female rats in step 1 and step 2 survived until the end of the 14-day observation period.

Clinical signs:

other: No symptoms were observed throughout the 14-day post-treatment period at any groups of the female animals.

Gross pathology:

All animals survived until the scheduled necropsy on Day 15.
Severe hydrometra was detected in two animals of group 2 and in female of the group 1, as well. Hydrometra is physiological finding and connected to the cycle of the animal.
No further pathological changes were found during the macroscopic examination of animals.

Other findings:

- Organ weights: not applicable
- Histopathology: not applicable
- Potential target organs: none
- Other observations: none

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The LD50 of the test item was determined to be above 2000 mg/kg body weight by oral route in the rat.

Executive summary:

A study according to OECD 423 was performed to assess the toxicity of test item when administered in a single dose to rats at one or more defined dose levels. The starting dose was selected on the basis of the available information about the test item and similar substances.

The acute toxic class method was carried out involving a stepwise procedure with the use of 2000 mg/kg bw as the starting dose in three female rats. No animal died in the first step at 2000 mg/kg bw dose level, so treatment with 2000 mg/kg bw was repeated on further three female rats. No animal died in the second step. Based on this the testing was terminated in accordance to the stopping criteria of Annex 2d of OECD Guideline No. 423.

Animals were weighed, observed for lethality and toxic symptoms for 14 days after the treatment. Gross pathological examination was carried out 15th day after the treatment in all animals.

No death occurred at 2000 mg/kg bw single oral dose of the test item. All female rats survived until the end of the 14-day observation period.

No symptoms were observed throughout the 14-day post-treatment period at any groups of the female animals.

The body weight development was undisturbed in all animals.

All organs of the animals treated with 2000 mg/kg bw proved to be free of treatment related gross pathological changes.

In conclusion, the LD50 of the test item was determined to be above 2000 mg/kg body weight by oral route in the rat.