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EC number: 219-546-8 | CAS number: 2459-09-8
Endpoint summary
Administrative data
Description of key information
Biodegradation in water:
Based on the Estimation Programs Interface Suite (EPI suite, 2017) the biodegradation potential of the test compound Methyl Isonicotinate (CAS No. 2459 -09 -8) in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that the test chemical Methyl Isonicotinate is expected to be readily biodegradable.
Biodegradation in water and sediment:
Estimation Programs Interface (EPI Suite, 2017) prediction model was run to predict the half-life in water and sediment for the test compound Methyl Isonicotinate (CAS No. 2459 -09 -8). If released in to the environment, 24.3 % of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of Methyl Isonicotinate in water is estimated to be 15 days (360 hrs). The half-life (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is low whereas the half-life period of Methyl Isonicotinate in sediment is estimated to be 135 days (3240 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.0779 %), indicates that Methyl Isonicotinate is not persistent in sediment.
Biodegradation in soil:
The half-life period of Methyl Isonicotinate (CAS No.2459 -09 -8) in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (EPI suite, 2017). If released into the environment, 75.3 % of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of Methyl Isonicotinate in soil is estimated to be 30 days (720 hrs). Based on this half-life value of Methyl Isonicotinate, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is low.
Additional information
Biodegradation in water:
Various predicted and experimental data for the target compound Methyl Isonicotinate (CAS No. 2459 -09 -8) and supporting weight of evidence studies for its closest read across substance with logKow as the primary descriptor were reviewed for the biodegradation end point which are summarized as below:
In first prediction using the Estimation Programs Interface Suite (EPI suite, 2017) the biodegradation potential of the test compound Methyl Isonicotinate (CAS No. 2459 -09 -8) in the presence of mixed populations of environmental microorganisms. The biodegradability of the substance was calculated using seven different models such as Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI Linear Model, MITI Non-Linear Model and Anaerobic Model (called as Biowin 1-7, respectively) of the BIOWIN v4.10 software. The results indicate that the test chemical Methyl Isonicotinate is expected to be readily biodegradable.
In a supporting study from peer reviewed journal (Biochemical Journal (1972)) for target chemical (2459-09-8) biodegradation experiment was conducted. Biodegradation study was conducted for evaluating the biodegradability of test substance Methyl Isonicotinate. Test was performed on the two strains Strain 4C1 and Strain 4C2 of bacteria able to grow with N methyl-isonicotinate as sole source of carbon and nitrogen. Two pathways by which Nmethylisonicotinate may be oxidized: one as in strain4C1 involving removal of the methyl group and oxidation to formaldehyde before ring-fission, and the other, as in strain 4C2, where ring-fission probably occurs before the liberation of methylamine from the N-methyl group of the aliphatic ring-fission product. Cultures were supplemented with 0.1 g of Oxoid yeast extract/liter. Media were sterilized by autoclaving at 121°C for 20min. starting culture 35 ml was inoculated in 100 ml conical flask and then reinoculated in the larger flask. Culture stored in the proper conditions of temperature and pH. Strain 4C1 was determine to metabolize N-methylisonicotinate most rapidly at 30°C at pH 7-7.2, with a substrate concentration of 200 mg/liter (0.2 g/l). Strain 4C1 was determine to metabolize N-methylisonicotinate most rapidly whereas Strain 4C2 were oxidized without lag, with oxygen uptakes of 4.5 mol/mol. Based on the oxygen uptake and oxidation of N Methylisonicotinate by the Strain 4C1 and Strain 4C2, it was concluded that the chemical was biodegradable.
In a prediction done by SSS (2017) using OECD QSAR toolbox version 3.3 with logKow as the primary descriptor, percentage biodegradability of test chemical Methyl isonicotinate (2459-09-8) was estimated. Test was carried out on the aerobic mcroorganisms. Test substance undergoes 85.1666 % degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical Methyl Isonicotinate was estimated to be readily biodegradable in water.
Similarly another biodegradation study (from authoritative database J-CHECK, 2017) was conducted for 28 days for evaluating the percentage biodegradability of test substance 2 -benzofuran-1(3H)-one (CAS no. 87 -41 -2). Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l, respectively. The percentage degradation of test substance was determined to be 95, 96 and 100% by BOD, TOC removal and HPLC parameter in 28 days. Thus, based on percentage degradation, 2 -benzofuran-1(3H)-one is considered to be readily biodegradable in nature.
Similarly another biodegradation study (from authoritative database J-CHECK, 2017) was conducted for evaluating the percentage biodegradability of test substance 1,4-Benzenedicarboxylicacid, 1,4-dimethyl ester (120 -61 -6). Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l, respectively. The percentage degradation of test substance was determined to be 84% and 100% by BOD and HPLC parameter in 14 days. Thus, based on percentage degradation of 1,4- Benzenedicarboxylic acid, 1,4-dimethyl ester is considered to be readily biodegradable in water.
On the basis of above results for target chemical Methyl Isonicotinate (CAS No. 2459 -09 -8) from J- check, EPI suite, QSAR, 2017 and Biochemical Journal 1972 and for its read across substance (from authoritative database J-CHECK, it can be concluded that the test substance Methyl Isonicotinate can be expected to be readily biodegradable in nature.
Biodegradation in water and sediment:
Estimation Programs Interface (EPI Suite, 2017) prediction model was run to predict the half-life in water and sediment for the test compound Methyl Isonicotinate (CAS No. 2459 -09 -8). If released in to the environment, 24.3 % of the chemical will partition into water according to the Mackay fugacity model level III and the half-life period of Methyl Isonicotinate in water is estimated to be 15 days (360 hrs). The half-life (15 days estimated by EPI suite) indicates that the chemical is not persistent in water and the exposure risk to aquatic animals is low whereas the half-life period of Methyl Isonicotinate in sediment is estimated to be 135 days (3240 hrs). However, as the percentage release of test chemical into the sediment is less than 1% (i.e, reported as 0.0779 %), indicates that Methyl Isonicotinate is not persistent in sediment.
Biodegradation in soil:
The half-life period of Methyl Isonicotinate (CAS No.2459 -09 -8) in soil was estimated using Level III Fugacity Model by EPI Suite version 4.1 estimation database (EPI suite, 2017). If released into the environment, 75.3 % of the chemical will partition into soil according to the Mackay fugacity model level III. The half-life period of Methyl Isonicotinate in soil is estimated to be 30 days (720 hrs). Based on this half-life value of Methyl Isonicotinate, it is concluded that the chemical is not persistent in the soil environment and the exposure risk to soil dwelling animals is low.
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