Methyl 5-deoxy-2,3-O-isopropylidene-β-D-ribofuranoside

Short-term toxicity to aquatic invertebrates

Administrative data

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 March 2013 to 26 Septebmer 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Fully GLP compliant and in accordance with current test guidelines

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Methylfuranoside

IUPAC Name:

Methylfuranoside

Constituent 2

Reference substance name:

Methyl 5-deoxy-2,3-O-isopropylidene-β-D-ribofuranoside

EC Number:

245-485-1

EC Name:

Methyl 5-deoxy-2,3-O-isopropylidene-β-D-ribofuranoside

Cas Number:

23202-81-5

Molecular formula:

C9H16O4

IUPAC Name:

methyl 5-deoxy-2,3-O-isopropylidene-beta-D-ribofuranoside

Test material form:

other: Pale yellow liquid

Details on test material:

Name: Methylfuranoside
CAS number: 23202-81-5
Batch number: 201111082008
Quantity received: 1.5 kg
Purity: 99.7%
Expiry date: November 2013
Date of receipt: 20 February 2013
Storage details: stored in a sealed container, at room temperature (15 to 30°C) in the dark

Sampling and analysis

Analytical monitoring:

yes

Test solutions

Vehicle:

yes

Details on test solutions:

The range-finding test was conducted at nominal test substance concentrations of 0.1, 1.0, 10 and 100 mg/L. A control group containing ASTM medium only was also included. Duplicate test vessels were prepared for each test substance concentration and control. Based on nominal concentrations, the results of the range-finding test suggested that the 48-hour EC50 value would be greater than 100 mg/L.
Based on the results of the range-finding test which is not fully reported, the definitive test was conducted at single nominal test substance concentration of 125 mg/L. This test design constitutes a ‘Limit Test’ to determine that, at the maximum concentration defined by the test guideline of 100 mg/L, no immobilisation was observed. A concentration of 125 mg/L was used to ensure measured concentrations were as close to 100 mg/L as possible.

Test organisms

Test organisms (species):

Daphnia magna

Details on test organisms:

TEST ORGANISM
- Common name: Daphnia magna
- Source: healthy parental laboratory cultures, held and maintained at the test facility
- Age at study initiation (mean and range, SD): less than 24 hours old
- Method of breeding: New cultures were started with juvenile Daphnia magna (less than 24 hours old), at a density of approximately 20 animals per litre. The cultures were fed daily with a concentrated suspension of Chlorella vulgaris prepared in accordance with local standard operating procedures. A seaweed extract was also added at each medium renewal as a dietary supplement.
- Feeding during test: Not fed during test
- Food type: Not applicable
- Amount: Not applicable
- Frequency: Not applicable

ACCLIMATION
- Acclimation period: Not applicable

Study design

Test type:

semi-static

Water media type:

not specified

Limit test:

yes

Total exposure duration:

72 h

Test conditions

Hardness:

Total hardness as CaCO3 (mg/L): 0-hour (new) - 144 mg/L, 24 hours (new) - 148 mg/L

Test temperature:

Temperature range: 20.3 - 21.3°C
Control vessel: 0 hour (new) - 20.2°C, 24 hours (old) - 19.7°C, 24 hours (new) - 19.7°C, 48 hours (old) - 19.9°C
125 mg/L test substance: 0 hours (new) - 20.4°C, 24 hours (old) - 19.7°C, 24 hours (new) - 19.7°C, 48 hours (old) - 20.0°C

pH:

pH control vessel: 0 hour (new) - 7.95, 24 hours (old) - 7.65, 24 hours (new) - 7.34, 48 hours (old) - 8.06
pH 125 mg/L test substance: 0 hours (new) - 7.93, 24 hours (old) - 7.73, 24 hours (new) - 7.34, 48 hours (old) - 8.07

Dissolved oxygen:

Dissolved oxygen % ASV (mg/L)
Control: 0 hours (new) - 99% (9.05 mg/L), 24 hours (old) - 101% (9.13 mg/L), 24 hours (new) - 100% (9.11 mg/L), 48 hours (old) - 100% (9.17 mg/L)
125 mg/L test substance: 0 hours (new) - 100% (9.14 mg/L), 24 hours (old) - 101% (9.26 mg/L), 24 hours (new) - 101% (9.18 mg/L), 48 hours (old) - 100% (9.20 mg/L)

Salinity:

Not applicable

Nominal and measured concentrations:

Nominal concentration 125 mg/L
24 hours (new) - 122 mg/L (97% nominal)
48 hours (old) - 118 mg/L (94% nominal)

Details on test conditions:

TEST SYSTEM
- Test vessel: The test vessels (nominal volume 150 mL) were glass crystallising dishes with clear lids
- Material, size, headspace, fill volume: containing 100 mL of the appropriate media
- Aeration: Not applicable
- Type of flow-through (e.g. peristaltic or proportional diluter): Not applicable
- Renewal rate of test solution (frequency/flow rate): 24 hours renewal
- No. of organisms per vessel: 5
- No. of vessels per concentration (replicates): 4
- No. of vessels per control (replicates): 4

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: Standard hard water was prepared according to ‘American Society for Testing and Materials (ASTM) Standards, Water and Environmental Technology, Section 11, Standard Guide for Conducting Acute Toxicity Tests with Fishes, Macroinvertebrates and Amphibians, E 729.
- Intervals of water quality measurement: Every 24 hours

OTHER TEST CONDITIONS
- Adjustment of pH: Not applicable
- Photoperiod: The test was conducted with a 16-hour light: 8-hour dark photoperiod.
- Light intensity: Not reported

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :
After 24 and 48 hours, the Daphnia magna in each test vessel were observed for evidence of immobility.

TEST CONCENTRATIONS
- Range finding study: The range-finding test was conducted at nominal test substance concentrations of 0.1, 1.0, 10 and 100 mg/L. A control group containing ASTM medium only was also included. Duplicate test vessels were prepared for each test substance concentration and control. Based on nominal concentrations, the results of the range-finding test suggested that the 48-hour EC50 value would be greater than 100 mg/L.
- Test concentrations: Based on the results of the range-finding test which is not fully reported, the definitive test was conducted at single nominal test substance concentration of 125 mg/L. This test design constitutes a ‘Limit Test’ to determine that, at the maximum concentration defined by the test guideline of 100 mg/L, no immobilisation was observed. A concentration of 125 mg/L was used to ensure measured concentrations were as close to 100 mg/L as possible.

Results and discussion

Effect concentrations

Effect concentrations 1

Duration:

48 h

Dose descriptor:

NOEC

Effect conc.:

125 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Effect concentrations 2

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

> 125 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Details on results:

Chemical analysis
The limit of detection (LOD) for Methylfuranoside in ASTM medium using this method was 0.032 mg/L.
Samples of test media were taken for chemical analysis at 0 and 24 hours (new test media) and at 24 and 48 hours (old test media). Chemistry analysis of the new media taken at 0 and 24 hours showed concentrations of Methylfuranoside to be 120 and 122 mg/L, respectively. Chemistry analysis of the old media at 24 and 48 hours showed concentrations of Methylfuranoside to be 140 and 118 mg/L, respectively. Nominal concentrations were achieved on preparation and were maintained for the duration of the test therefore the results will be reported as nominal concentrations.

Test media descriptions
The test preparations were observed to be colourless solutions throughout the duration of the test.

Toxicity to daphnia
After 48 hours, the concentration at which no significant (=10%) immobility occurred was 125 mg/L. The NOEC was therefore 125 mg/L.
The 48-hour EC50 value was determined to be greater than 125 mg/L.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The 48-hour acute toxicity of Methylfuranoside to the freshwater planktonic crustacean, Daphnia magna, was determined in accordance with the requirements of OECD Chemicals Testing Guideline No. 202 Daphnia sp. Acute Immobilisation Test (adopted April 13 2004).
The validity criteria for control immobility (=10%) and dissolved oxygen (>60% ASV) were both satisfied. The test is therefore considered valid.
The 48-hour EC50 value was determined to be greater than 125 mg/L.
It is concluded that Methylfuranoside was considered non toxic to Daphnia magna at nominal concentrations less than 125 mg/L under the conditions of this test.