Quaternary ammonium compounds, di-C14-18-alkyldimethyl, Me sulfates

Endpoint summary

Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

- negative: Ames test with S. typhimurium TA98, TA100, TA1535, TA1537 and E. coli WP2 uvr A (met. act.: with and without) (OECD TG 471; GLP); cytotoxicity: yes; read-across from Di-C12-18 alkyl-dimethyl ammonium chloride

- negative: Mammalian cell gene mutation assay with mouse lymphoma L5178Y cells (TK) (met. act.: with and without) (OECD TG 476; GLP); cytotoxicity: yes; read across from Quaternary ammonium compounds, Benzylbis(hydrogenated tallow alkyl)methyl, chlorides

- negative: In vitro mammalian chromosome aberration test with V79 Chinese Hamster cells (met. act.: with and without) (OECD TG 473; GLP); cytotoxicity: yes; read across from DODMAC

Link to relevant study records

Reference

Reference 1

Endpoint:

in vitro cytogenicity / chromosome aberration study in mammalian cells

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar toxicological properties because
• they are manufactured from similar or identical precursors under similar conditions
• they share structural similarities with common functional groups: quaternary ammonium and saturated or unsaturated alkyl chains with comparable length (corresponding to scenario 2 of the read-across assessment framework)

The read-across hypothesis is based on structural similarity of target and source substances. Based on available experimental data, including key physicochemical properties and data from acute toxicity, irritation, sensitization (human) and genotoxicity studies, the read-across strategy is supported by a quite similar toxicological profile of all substances.

Therefore, read-across from the existing ecotoxicity, environmental fate and toxicity studies conducted with the source substances is considered as an appropriate adaptation to the standard information requirements of the REACH Regulation for the target substance, in accordance with the provisions of Annex XI, 1.5 of the REACH Regulation.

A justification for read-across is attached to IUCLID section 13.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
See justification for read-across attached to IUCLID section 13.

3. ANALOGUE APPROACH JUSTIFICATION
See justification for read-across attached to IUCLID section 13.

4. DATA MATRIX
See justification for read-across attached to IUCLID section 13.

Reason / purpose for cross-reference:

read-across: supporting information

Reason / purpose for cross-reference:

read-across source

Type of assay:

in vitro mammalian chromosome aberration test

Species / strain:

Chinese hamster lung fibroblasts (V79)

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

18 and 28 hours after treatment at 40 µg/ml without S9 mix

Vehicle controls validity:

not specified

Untreated negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Conclusions:

Interpretation of results: negative with and without S9

Reference 2

Endpoint:

in vitro gene mutation study in mammalian cells

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar toxicological properties because
• they are manufactured from similar or identical precursors under similar conditions
• they share structural similarities with common functional groups: quaternary ammonium and saturated or unsaturated alkyl chains with comparable length (corresponding to scenario 2 of the read-across assessment framework)

The read-across hypothesis is based on structural similarity of target and source substances. Based on available experimental data, including key physicochemical properties and data from acute toxicity, irritation, sensitization (human) and genotoxicity studies, the read-across strategy is supported by a quite similar toxicological profile of all substances.

Therefore, read-across from the existing ecotoxicity, environmental fate and toxicity studies conducted with the source substances is considered as an appropriate adaptation to the standard information requirements of the REACH Regulation for the target substance, in accordance with the provisions of Annex XI, 1.5 of the REACH Regulation.

A justification for read-across is attached to IUCLID section 13.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
See justification for read-across attached to IUCLID section 13.

3. ANALOGUE APPROACH JUSTIFICATION
See justification for read-across attached to IUCLID section 13.

4. DATA MATRIX
See justification for read-across attached to IUCLID section 13.

Reason / purpose for cross-reference:

read-across: supporting information

Reason / purpose for cross-reference:

read-across source

Species / strain:

mouse lymphoma L5178Y cells

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

without S9 mix ≥ 50 µg/mL at the 3-hour treatment; ≥ 10 µg/mL at the 24-hour treatment with S9 mix ≥ 100 µg/mL at the 3-hour treatment

Vehicle controls validity:

valid

Untreated negative controls validity:

not specified

Positive controls validity:

valid

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Conclusions:

Interpretation of results: negative with and without S9 mix

Reference 3

Endpoint:

in vitro gene mutation study in bacteria

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar toxicological properties because
• they are manufactured from similar or identical precursors under similar conditions
• they share structural similarities with common functional groups: quaternary ammonium and saturated or unsaturated alkyl chains with comparable length (corresponding to scenario 2 of the read-across assessment framework)

The read-across hypothesis is based on structural similarity of target and source substances. Based on available experimental data, including key physicochemical properties and data from acute toxicity, irritation, sensitization (human) and genotoxicity studies, the read-across strategy is supported by a quite similar toxicological profile of all substances.

Therefore, read-across from the existing ecotoxicity, environmental fate and toxicity studies conducted with the source substances is considered as an appropriate adaptation to the standard information requirements of the REACH Regulation for the target substance, in accordance with the provisions of Annex XI, 1.5 of the REACH Regulation.

A justification for read-across is attached to IUCLID section 13.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
See justification for read-across attached to IUCLID section 13.

3. ANALOGUE APPROACH JUSTIFICATION
See justification for read-across attached to IUCLID section 13.

4. DATA MATRIX
See justification for read-across attached to IUCLID section 13.

Reason / purpose for cross-reference:

read-across: supporting information

Reason / purpose for cross-reference:

read-across source

Species / strain:

S. typhimurium TA 1535, TA 1537, TA 98 and TA 100

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

at 1000 µg/plate in TA1537, TA100 & TA98

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Species / strain:

S. typhimurium TA 1538

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

at 1000 µg/plate

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Species / strain:

E. coli WP2 uvr A

Metabolic activation:

with and without

Genotoxicity:

negative

Cytotoxicity / choice of top concentrations:

cytotoxicity

Remarks:

at 2500 µg/plate

Vehicle controls validity:

valid

Untreated negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

other: all strains/cell types tested

Remarks:

Migrated from field 'Test system'.

Conclusions:

Interpretation of results: negative with and without metabolic activation
Based on the results of this study, the test substance did not show any mutagenic activity in the five Salmonella typhimurium strains tested with and without metabolic activation.

Reference 4

Endpoint:

in vitro gene mutation study in bacteria

Type of information:

(Q)SAR

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification

Justification for type of information:

1. SOFTWARE
VEGA 1.1.3, 19-09-2016

2. MODEL (incl. version number)
Mutagenicity (Ames test) CONSENSUS model 1.0.1
Mutagenicity (Ames test) model (CAESAR) 2.1.13
Mutagenicity (Ames test) model (SarPy/IRFMN) 1.0.7
Mutagenicity (Ames test) model (ISS) 1.0.2
Mutagenicity (Ames test) model (KNN/Read-Across) 1.0.0

3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
CCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCCC

4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
- Defined endpoint: Ames test

5. APPLICABILITY DOMAIN
A combination of similar compounds, accuracy of prediction for similar molecules found in the training set, similar molecules found in the training set having experimental values that agree with the predicted value, descriptors for the compound having values inside the descriptor range of the compounds of the training set and all atom centered fragment of the compound having been found in the compounds of the training set is used to derive a global AD index (= measured applicability domain score).

6. ADEQUACY OF THE RESULT
All models have the same outcome: non-mutagenic in the Ames test, although some of the model reports show some critical aspects (only moderately similar compounds with known experimental value in the training set have been found). The result is used in a weight of evidence approach.

Principles of method if other than guideline:

QSAR prediction of Ames test

GLP compliance:

no

Type of assay:

bacterial reverse mutation assay

Remarks on result:

no mutagenic potential (based on QSAR/QSPR prediction)

Conclusions:

C14-18 alkyldimethyl ammonium methosulfate is predicted to be negative in the Ames test.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (negative)

Genetic toxicity in vivo

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

No experimental data are available for the target substance C14-18 alkyldimethyl ammonium methosulfate. However, C14-18 alkyldimethyl ammonium methosulfate is predicted to be negative in the Ames test using VEGA 1.1.3. (CONSENSUS model 1.0.1, CAESAR 2.1.13, SarPy/IRFMN 1.0.7, ISS 1.0.2 and KNN/Read-Across 1.0.0). Moreover, a reverse gene mutation assay in bacteria according to OECD guideline 471 is available for the source substance Di-C12-18 alkyl-dimethyl ammonium chloride. A mammalian cell gene mutation assay, and an in vitro mammalian chromosome aberration test are available for the source substances Quaternary ammonium compounds, Benzylbis(hydrogenated tallow alkyl)methyl, chlorides and DODMAC, respectively. A justification for read-across is attached to IUCLID section 13.

 

in vitro gene mutation study in bacteria

In a reverse gene mutation assay in bacteria according to OECD guideline 471 (1997) and EU method B.13/14 (2008), Salmonella typhimurium strains TA98, TA100, TA1535, TA1537 and E. coli WP2 uvr A were exposed to Di-C12-18 alkyldimethyl ammonium chloride in ethanol in concentrations of 0 (control), 0316, 1.0, 3.16, 10.0, 31.6 and 100 µg/plate in all strains in the absence and presence of mammalian metabolic activation (rat liver S9 mix). The assay was performed using the plate incorporation method (1st experiment) and pre-incubation method (2nd experiment; 20 min pre-incubation).

The test substance was tested up to cytotoxic concentrations. Pronounced cytotoxicity was noted at 100 μg/plate in in all strains.

The positive control items showed a significant increase in the number of revertant colonies of the respective test strain and confirmed the validity of the test conditions and the sensitivity of the test system. The results of the negative and positive control cultures were within the range of the historical data. Hence, all acceptance criteria are met.

No increase in revertant colony numbers as compared with control counts was observed for the test item in the Salmonella typhimurium and in the Escherichia coli test strains in two independent experiments without and with metabolic activation, respectively (plate incorporation and preincubation test).

Under the conditions of the study, the test substance was negative for mutagenic potential.

 

The source substance DODMAC as well was not mutagenic in a reverse gene mutation assay in bacteria. The preliminary assay with or without metabolic activation showed that the test substance demonstrated a potent toxicity from 1000 to 2500 µg/plate in all Salmonella strains tested. Under these conditions, the dose of 1000 µg/plate was retained as the maximum dose tested for the mutagenicity assay in Salmonella strains. In Escherichia Coli WP2uvrA, the top dose was 2500 µg/plate.

No precipitate was observed in the petri plates when scoring the revertants at all dose-levels. Without metabolic activation, toxicity was observed at the dose level of 1000 µg /plate for TA 1537, TA 1538, TA 98 and TA 100 strains. In Escherichia Coli WP2uvrA, toxicity was noted at 2500 µg /plate. With metabolic activation, cytotoxicity was limited to the strain TA 1537 which exhibited toxicity at the highest dose-level of 1000 µg/plate.

No significant increase in the mean number of revertants was noted in the five Salmonella typhimurium strains and Escherichia coli tested in the presence of the test substance neither with nor without metabolic activation. It was concluded that DODMAC was not mutagen under the conditions of the study.

 

in vitro gene mutation study in mammalian cells

The potential for Quaternary ammonium compounds, Benzylbis(hydrogenated tallow alkyl)methyl, chlorides to induce mutations at the TK locus, was investigated in L5178Y mouse lymphoma cells. The test substance was tested in two independent experiments, both with and without metabolic activation. Approximately 0.5 x 106(3-hour treatment) or 0.15 x 106(24-hour treatment) cells/mL in 20 mL culture medium with 5% horse serum were exposed to the test or control items, in the presence or absence of S9 mix (final concentration of S9 fraction 2%), at 37°C. Since the test item was toxic in the preliminary test, the choice of the highest dose-level for the main experiments was based on the level of toxicity (decrease in Adj. RTG), according to the criteria specified in the international guidelines.

In the experiments without metabolic activation, the selected dose-levels were as follows:

 2.34, 4.69, 9.38, 18.75, 37.5 and 75 µg/mL for the first experiment (3-hour treatment),

1.56, 3.13, 6.25, 12.5, 25 and 50 µg/mL for the second experiment (24‑hour treatment).

Cytotoxicity was observed. Following the 3-hour treatment, a marked to severe toxicity was induced at dose-levels ≥ 37.5 µg/mL, as shown by a 61-100% decrease in Adj. RTG. Following the 24-hour treatment, a marked to severe toxicity was induced at dose‑levels ≥ 6.25 µg/mL, as shown by a 80-100% decrease in Adj. RTG.

No noteworthy increase in the mutation frequency was noted in comparison to the vehicle control following the 3-hour or the 24-hour treatments.

In the experiments with metabolic activation, the selected dose-levels were as follows:

4.69, 9.38, 18.75, 37.5, 75 and 150 µg/mL for the first experiment,

2.34, 4.69, 9.38, 18.75, 37.5 and 75 µg/mL for the second experiment.

 In the first experiment, a slight to strong precipitate was noted in the culture medium at the end of the 3-hour treatment at dose-levels ≥ 4.69 µg/mL.

Cytotoxicity was observed. In the first experiment, a severe toxicity was induced at dose-levels ≥ 75 µg/mL, as shown by a 88-100% decrease in Adj. RTG. In the second experiment, a moderate to severe toxicity was induced at dose-levels ≥ 37.5 µg/mL, as shown by a 49-100% decrease in Adj. RTG.

In either experiment, no noteworthy increase in the mutation frequency was noted in comparison to the vehicle control. 

 

in vitro chromosome aberration study in mammalian cells

In the Hoechst AG study (1989), DODMAC (90% active in isopropanol/water) was examined for its genotoxic activity in V79 Chinese Hamster cells. The induction of the chromosome aberrations after in vitro treatment was investigated in the presence and in the absence of S9 mix.

A preliminary cytotoxicity experiment was performed in order to select the appropriate dose-levels for the main experiment. The test substance produced a significant cytotoxic effect (reduction of plating efficiency) without metabolic activation from 50 µg/ml up to a concentration of 200 µg/ml which was the limit of solubility.

In the main experiment, two independent cell cultures with and without metabolic activation (S9 -mix) were used with the dose-levels of 4, 20 and 40 µg/ml in the absence of metabolic activation and 5, 25 and 50 µg/ml in the presence of metabolic activation.

The test substance did not induce increase in the number of metaphases with aberration at any preparation time and dose-level.

A cytotoxic effect was observed 18 and 28 hours after treatment at 40 µg/ml without metabolic activation. Marked increases in the rate of chromosome aberrations were observed with the positive controls indicating the sensitivity of the assay.

In conclusion, DODMAC does not induce chromosome mutations (aberrations) in V79 Chinese hamster cells, neither in the presence nor in the absence of a metabolic activation system.

Justification for classification or non-classification

Based on reliable, relevant and adequate data C14-18 alkyldimethyl ammonium methosulfate is considered to be not mutagenic and not clastogenic. According to Regulation EC No 1272/2008 no classification and labelling for mutagenicity is required.