(+)-L-arginine hydrochloride

Endpoint summary

Description of key information

Acute oral toxicity: Key study. Test method similar to OECD 401. The LD50 of L-argine-HCl was determined to be 12400 mg/kg b.w. in a toxicity study with rats.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1973

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

- Principle of test: Determination of acute toxicity by Seventy-Two-Hour LD50 calculation. The number dead at 72 hr. was counted and analyzed by the method of Litchfield and Wilcoxon (J. T. Litchfield, Jr., and F. Wilcoxon, J. Pharmacol. Exp Ther., 96, 99(1949))

GLP compliance:

no

Test type:

standard acute method

Limit test:

no

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Age at study initiation: 2 months
- Weight at study initiation: 125-150 g
- Fasting period before study: 24 h
- Housing: no data
- Diet (e.g. ad libitum): Ad libitum.
- Water (e.g. ad libitum): Ad libitum.
- Acclimation period: 1 week

Route of administration:

oral: gavage

Vehicle:

water

Remarks:

(distilled water)

Details on oral exposure:

VEHICLE
- Amount of vehicle (if gavage): 6 ml
- Concentration in vehicle: 10 and 20 % (w/v)
- Justification for choice of vehicle: Destilled water has no impact on its own

MAXIMUM DOSE VOLUME APPLIED: 6 ml

Doses:

10 and 20 % (w/v) in vehicle

No. of animals per sex per dose:

5

Control animals:

yes

Details on study design:

- Duration of observation period following administration: 72 hours
- Frequency of observations and weighing: mortality at 72 h.
- Other examinations performed: ataxia and sleeping time.

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

12 400 mg/kg bw

Based on:

test mat.

Remarks on result:

other: 12.40 ± 0.61 (calculated by the method of Litchfield and Wilcoxon)

Mortality:

Not specified.

Clinical signs:

Some signs of toxicity did appear such as ataxia, dyspnea, decreased muscle tonus, and loss of righting reflex. Toxicity signs were first observed 11 g/kg bw.

Body weight:

Not specified.

Gross pathology:

not specified.

Interpretation of results:

other: No category (CLP Regulation EC no. 1272/2008)

Conclusions:

LD50 of L-argine-HCl was determined to be 12400 mg/kg b.w. in a toxicity study with rats.

Executive summary:

The acute oral toxicity of L-argine-HCl was investigated with Sprague-Dawley rats. Test item was administered at two dose levels of 10 and 20% (w/v) in distilled water (five males and five females per group). After 72 hours, neurological parameters like ataxia or sleeping time were observed and the number of dead was counted and analyzed by the method of Litchfield and Wilcoxon.Some signs of toxicity were reported such as ataxia, dyspnea, decreased muscle tonus, and loss of righting reflex. Toxicity signs were first observed 11 g/kg bw. LD50 of L-argine-HCl was determined to be 12400 mg/kg b.w.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

12 400 mg/kg bw

Quality of whole database:

Key study with Klimisch score = 2

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Acute oral toxicity: Key study: The acute oral toxicity of L-argine-HCl was investigated with Sprague-Dawley rats. Test item was administered at two dose levels of 10 and 20% (w/v) in distilled water (five males and five females per group). After 72 hours, neurological parameters like ataxia or sleeping time were observed and the number of dead was counted and analyzed by the method of Litchfield and Wilcoxon.Some signs of toxicity were reported such as ataxia, dyspnea, decreased muscle tonus, and loss of righting reflex. Toxicity signs were first observed 11 g/kg bw. LD50 of L-argine-HCl was determined to be 12400 mg/kg b.w.

Justification for classification or non-classification

Based on the available data, the substance does not need to classify for acute toxicity according to CLP Regulation (EC) no. 1272/2008.