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Description of key information

'Cell Free Harpin Extract of Harpinαβ produced by fermentation' is not considered to be acutely harmful by the oral route.

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:
4 April - 12 June 2003
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EPA OPPTS 870.1100 (Acute Oral Toxicity)
Deviations:
no
GLP compliance:
yes
Test type:
up-and-down procedure
Limit test:
yes
Specific details on test material used for the study:
- Test material: EBC 351 (1% Harpin αß)
- Lot No. of test material: DP021112
- Expiration date of the lot: 20 Feb 04
- Appearance: Pale yellow granular solid
- Storage: Refrigerated at 4°C

The test substance EBC 351 is a product formulation containing 11% w/w of the reference substance, 'Cell Free Harpin Extract of Harpinαβ produced by fermentation', and various other non-toxic substances including maltodextrin (listed in Annex IV of Regulation No/ 1907/2006). Therefore, any toxicity seen in the toxicology studies would most likely be caused by the presence of the reference substance rather than the other product co-formulants. Furthermore, ECB 351 contains a higher percentage of Harpin αß and fermentation solids then the reference substance (ca. 11% versus ca. 5%) and therefore the study results would actually over-estimate the toxicity expected if the reference substance itself had been tested. Therefore, results obtained with EBC 351 can be used in support of the reference substance 'Cell Free Harpin Extract of Harpinαβ produced by fermentation'.
Species:
rat
Strain:
Sprague-Dawley
Sex:
female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Texas Animal Specialties, Humble, Texas
- Females nulliparous and non-pregnant: yes
- Age at study initiation: Approx. 9 weeks old
- Weight at study initiation: 172 - 193 g
- Fasting period before study: 16 hours before dosing
- Housing: Suspended, wire bottom, stainless steel cage; 1 animal per cage
- Diet: PMI Feeds Inc. Formulab #5008 available ad libitum
- Water: Municipal water supply available ad libitum from automatic water system
- Acclimation period: Not specified

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

IN-LIFE DATES: From: 06 April 2003 To: 23 April 2003
Route of administration:
oral: gavage
Vehicle:
water
Details on oral exposure:
VEHICLE
- Concentration in vehicle: 40% w/v

MAXIMUM DOSE VOLUME APPLIED: 12.6 mL/kg dose was administered
Doses:
5050 mg/kg
No. of animals per sex per dose:
3 females per dose
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations for mortality and clinical/ behavioural signs of toxicity: at least three times on the day of dosing (Day 0) and at least once daily thereafter for 14 days
- Frequency of weighing: Individual body weights were recorded just prior to dosing and on days 7 and 14.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight, gross necropsy
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 5 050 mg/kg bw
Based on:
test mat.
Remarks on result:
not determinable due to absence of adverse toxic effects
Mortality:
There was no mortality during the study.
Clinical signs:
All animals appeared normal for the duration of the study.
Body weight:
Body weight gain was unaffected by the administration of the test substance.
Gross pathology:
The gross necropsy conducted at termination of the study revealed no observable abnormalities.
Other findings:
- Actual temperature: 21 - 26°C
- Actual relative humidity: 30 - 79%

[Deviations of high temperature/ humidity did not affect the study outcome]

Table 1: Body weights, time of death and gross necropsy (Dose level 5050 mg/kg, 12.6 mL/kg)

Animal No.

Date of dosing

Body weights (g)

Time of death*

Gross necropsy findings

Day 0

Day 7

Final

71-F

7 Apr 03

193

235

253

Day 14

No observable abnormalities

72-F

9 Apr 03

180

217

250

Day 14

No observable abnormalities

73-F

9 Apr 03

172

207

218

Day 14

No observable abnormalities

* Day of dosing is Day 0; Day 14 is terminal sacrifice

 

 

Interpretation of results:
GHS criteria not met
Conclusions:
The acute oral LD50 of the test substance, EBC 351 (1% Harpin ab), is estimated to be greater than 5050 mg/kg in females. Based on this result, the acute oral toxicity of 'Cell Free Harpin Extract of Harpinαβ produced by fermentation' is also expected to be acutely non-toxic and to be above the limit of classification.
Endpoint conclusion
Endpoint conclusion:
no adverse effect observed

Additional information

Justification for classification or non-classification

Oral: The oral LD50 for rats was >2000 mg/kg bw in a study performed in accordance with EPA OPPTS 870.1100. Therefore, the substance does not require classification according to the criteria described in Regulation (EC) No. 1272/2008.