[4-[[4-anilino-1-naphthyl][4-(dimethylamino)phenyl]methylene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium acetate

Endpoint summary

Description of key information

Short-term toxicity to fish:

Fish Acute Toxicity test according to OECD Guideline 203 was conducted for (test item name) [4-[[4-anilino-1-naphthyl][4 -(dimethylamino)phenyl]methylene]cyclohexa-2,5-dien-1-ylidene] dimethylammonium acetate. The test solution was prepared by dissolving 100 mg of the test substance in 100 ml of potable water (passed through reverse osmosis system) with 1 hr.continuous stirring for achieving test concentrations of 1g/L. The nominal concentration selected for the experiment were 0.3125mg/L,0.625mg/L,1.25mg/L,2.5mg/L,5mg/Land test fish were exposed to these concentration for 96 hours. After 96hrs of exposure LC0, LC50 and LC100 was observed.

The lethal concentrations LC50 was determine to be >0.3125 mg/L but <0.625 mg/L

LC0 (96 hours) (highest loading at which no mortality was observed) = 0.3125 mg/L

LC50 (96 hours) Experimental = >0.3125 mg/L but <0.625 mg/L

LC100 (96 hours) (lowest loading at which 100% mortality was observed) = 0.625 mg/L

Short term toxicity on aquatic invertebrates:

Determination of the inhibition of the mobility of daphnids was carried out with the substance N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate according to OECD Guideline 202. The test substance was tested at the concentrations 0, 0.006, 0.012, 0.025, 0.050, 0.100 mg/l. Effects on immobilisation were observed for 48 hours. The median effective concentration (EC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl ]methylene} cyclohexa-2,5-dien-1-ylidene)-N- methylmethanaminium acetate, in Daphnia magna was determined to be 0.037 mg/L for immobilisation effects. This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic acute 1 as per the CLP criteria.

Toxicity to aquatic algae and cyanobacteria:

Freshwater algal growth inhibition test was carried out on Desmodesmus subspicatus with the substance N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate according to OECD Guideline 201. The stock solution 100 mg/L was prepared by dissolving blue liquid in OECD growth medium and tested at the concentrations 0, 5, 10, 20, 40, 80 mg/l. Effects on the growth rate of the organism were studied. The median effective concentration (ErC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien-1-ylidene) -N-methylmethanami- nium acetate, in Desmodesmus subspicatus was determined to be14.8 mg/L. This value indicates that the substance is likely to be hazardous to aquatic algae and can be classified as aquatic chronic 3 as per the CLP criteria.

 

Toxicity to microorganisms:

Based on the prediction done using the OECD QSAR toolbox version 3.3 with log kow as the primary descriptor and considering the eight closest read across substances, toxicity on Tetrahymena pyriformis was predicted for N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate (83803 -79 -6). The IGC50 value was estimated to be 555.035 mg/l when N-(4-{[4-(dimethylamino) phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate exposed to Tetrahymena pyriformis for 48hrs.   

Additional information

Short-term toxicity to fish:

Based on the various predicted data for the target chemical study have been reviewed to determine the toxic nature of target chemical N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate (83803 -79 -6). The studies are as mentioned below:

 

In the first experimental key study for the target chemical (83803-79-6) from UERL lab, 2016, toxicity was measured on the fish. Fish Acute Toxicity test according to OECD Guideline 203 was conducted for (test item name) [4-[[4-anilino-1-naphthyl][4 -(dimethylamino)phenyl]methylene]cyclohexa-2,5-dien-1-ylidene] dimethylammonium acetate. The test solution was prepared by dissolving 100 mg of the test substance in 100 ml of potable water (passed through reverse osmosis system) with 1 hr.continuous stirring for achieving test concentrations of 1g/L. The nominal concentration selected for the experiment were 0.3125mg/L,0.625mg/L,1.25mg/L,2.5mg/L,5mg/Land test fish were exposed to these concentration for 96 hours. After 96hrs of exposure LC0, LC50 and LC100 was observed.

The lethal concentrations LC50 was determine to be >0.3125 mg/L but <0.625 mg/L

LC0 (96 hours) (highest loading at which no mortality was observed) = 0.3125 mg/L

LC50 (96 hours) Experimental = >0.3125 mg/L but <0.625 mg/L

LC100 (96 hours) (lowest loading at which 100% mortality was observed) = 0.625 mg/L

 

 

Similarly in the second supporting study for the target chemical (83803-79-6) from Department of Toxicology BASF SE, 1989. Study was conducted to determine the toxic nature of chemical N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate on the growth of fish Leuciscus idus. Test was performed according to the OECD guideline. The doses were chosen based on two range finding studies between 0.3 and 1 mg/l) the concentrations, spaced by a factor of about 2.2. Control, 0.01, 0,022, 0.046, 0.1, 0.215, 0464, 1.0, 2.15 mg/L concentration was taken in the study. In the form of an aqueous solution (0.1 g/100 ml) the product was added to the test water, subsequently the fish were placed into the aquaria. Leuciscus idus (golden variety) used as a test organism collected from Fischzucht Paul Eggers, 2354 Hohenwestedt, Germany. Fish does not feed during test. Open glass aquaria having dimeter 30 x 22 x 24 cm, was used having the capacity of 10 liter. 2.8 g fish /L was added. 10 organisms per vessel was used. Chloracetamid added as a reference substance. After the exposure of 96hrs LC50 observed on the basis of Apathy and narcotic-like state was determine at test concentration 2.15 mg/L after 1 hour. In reference substance Chloracetamid the LC50 was 32 mg/L at 48 hr. Based on the mortality LC50 was 0.158 mg/l and the LC100 was 0.0464 mg/l.

Based on the LC50 chemical was consider as toxic and can be consider to be classified as aquatic acute 1 category as per the CLP classification criteria.

 

Short term toxicity on aquatic invertebrates:

Short term toxicity to aquatic invertebrates for N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate (83803-79-6) was summaries with experimental data for target and experimental study of structural and functional similar read across substance are summaries as follows: 

 

In the first key study for the N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate (83803-79-6) from ABITEC lab 2017, determination of the inhibition of the mobility of daphnids was carried out with the substance N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate according to OECD Guideline 202. The test substance was tested at the concentrations 0, 0.006, 0.012, 0.025, 0.050, 0.100 mg/l. Effects on immobilisation were observed for 48 hours. The median effective concentration (EC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl ]methylene} cyclohexa-2,5-dien-1-ylidene)-N- methylmethanaminium acetate, in Daphnia magna was determined to be 0.037 mg/L for immobilisation effects. This value indicates that the substance is likely to be hazardous to aquatic invertebrates and can be classified as aquatic acute 1 as per the CLP criteria.

 

Similarly in the second supporting study for the read across chemical (569-64-2) which was structurally and functionally similar to the target chemical study was carried out from j-check 2017. Short term toxicity to aquatic invertebrate was performed in daphnia magna for 48 hrs. After the experiment, the EC 50 value for N-(4-{[4-(dimethylamino)phenyl](phenyl) methylene}cyclohexa -2,5-dien-1-ylidene)-N-methylmethanaminium chloride was determined to be 0.13 mg/l. Thus, based on the EC50 value, it can be concluded that the substance N-(4 -{[4 -(dimethylamino)phenyl](phenyl)methylene}cyclohexa-2,5 -dien-1 -ylidene)-N-methylmethanaminium chloride can be considered as toxic to aquatic organisms and can be consider to be classified as aquatic acute 1 category as per the CLP classification criteria.

 

Thus based on the both studies for the toxicity to aquatic invertebrates daphnia, it can be concluded that the N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien- 1-ylidene)-N-methylmethanaminium acetate (83803-79-6) was toxic to aquatic invertebrates and can be classified as aquatic acute 1 as per the CLP criteria.

 

Toxicity to aquatic algae and cyanobacteria:

Freshwater algal growth inhibition test was carried out on Desmodesmus subspicatus with the substance N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate according to OECD Guideline 201. The stock solution 100 mg/L was prepared by dissolving blue liquid in OECD growth medium and tested at the concentrations 0, 5, 10, 20, 40, 80 mg/l. Effects on the growth rate of the organism were studied. The median effective concentration (ErC50) for the test substance, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene} cyclohexa-2,5-dien-1-ylidene) -N-methylmethanami- nium acetate, in Desmodesmus subspicatus was determined to be14.8 mg/L. This value indicates that the substance is likely to be hazardous to aquatic algae and can be classified as aquatic chronic 3 as per the CLP criteria.

 

Toxicity to microorganisms:

Based on the various predicted data for the target chemical and read across chemicals study have been reviewed to determine the toxic nature of target chemical

N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate (83803 -79 -6). The studies are as mentioned below:

 

In the first predicted study for N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate (83803 -79 -6) from QSAR, 2017 toxicity was determine. Based on the prediction done using the OECD QSAR toolbox version 3.3 with log kow as the primary descriptor and considering the eight closest read across substances, toxicity on Tetrahymena pyriformis was predicted for N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate (83803 -79 -6). The IGC50 value was estimated to be 555.035 mg/l when N-(4-{[4-(dimethylamino) phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene)-N-methylmethanaminium acetate exposed to Tetrahymena pyriformis for 48hrs.   

 

Similarly in the second study for the read across chemical (121 -69 -7) from ecotox, 2017. A test was developed using Tetrahymena pyriformis in order to determine the toxicity of  chemical. Pre-cultured T. pyriformis was exposed for 24 h at 30°C to various concentrations of chemicals, and the number of T. pyriformis surviving were then counted. The concentration of the chemical, at which the proliferation of T. pyriformis was restricted to one-half of the blank test (EC50), was determined. The effective concentration (EC50) value for N, N-dimethylaniline in Tetrahymena pyriformis in a 24 hr study was determine to be 110 mg/L on the basis of effect on population growth rate.

Based on the data for the toxicity on fish, aquatic invertebrates and algae, N-(4-{[4-(dimethylamino)phenyl][4-(methylamino)phenyl]methylene}cyclohexa-2,5-dien-1-ylidene) -N-methylmethanaminium acetate (83803 -79 -6) was consider as toxic and can be consider to be classified as aquatic acute 1 category as per the CLP classification criteria