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Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Justification for type of information:
Data is from computational model developed by USEPA
Qualifier:
according to
Guideline:
other: Modeling database
Principles of method if other than guideline:
The Biodegradation Probability Program (BIOWIN) estimates the probability for the rapid aerobic biodegradation of an organic chemical in the presence of mixed populations of environmental microorganisms .The model is part of the EpiSuite program of the US-EPA. Estimations are made with BIOWIN version 4.10. Estimates are based upon fragment constants that were developed using multiple linear and non-linear regression analyses. Experimental biodegradation data for the multiple linear and non-linear regressions were obtained from Syracuse Research Corporation's (SRC) data base of evaluated biodegradation data (Howard et. al., 1987). This version (v4.10) designates the models as follows (see also Boethling et al. 2003):
Biowin1 = linear probability model
Biowin2 = nonlinear probability model
Biowin3 = expert survey ultimate biodegradation model
Biowin4 = expert survey primary biodegradation model
Biowin5 = MITI linear model
Biowin6 = MITI nonlinear model
Biowin7 = anaerobic biodegradation model
GLP compliance:
not specified
Specific details on test material used for the study:
- Name of test material: 2,3-bis[(4-methylbenzoyl)oxy]succinic acid
- IUPAC name: (+)-Di-p-toluoyl-D-tartaric Acid
- Molecular formula: C20H18O8
- Molecular weight: 386.3542 g/mole
- Smiles : Cc1ccc(cc1)C(=O)O[C@@H]([C@H](OC(=O)c2ccc(C)cc2)C(=O)O)C(=O)O
- Inchl: 1S/C20H18O8/c1-11-3-7-13(8-4-11)19(25)27-15(17(21)22)16(18(23)24)28-20(26)14-9-5-12(2)6-10-14/h3-10,15-16H,1-2H3,(H,21,22) (H,23,24)/t15-,16-/m0/s1
- Substance type: Organic
- Physical state: Solid powder (white)
Oxygen conditions:
other: aerobic (Biowin 1-6) and anaerobic (Biowin 7)
Inoculum or test system:
other: mixed populations of environmental microorganisms
Duration of test (contact time):
3.205 wk
Details on study design:
Using the computer tool BIOWIN v4.10 by US-EPA (EPIWIN) the aerobic as well as the anaerobic biodegradability of the test material can be estimated. The follwoing seven different models are used by the tool: Linear Model, Non-Linear Model, Ultimate Biodegradation Timeframe, Primary Biodegradation Timeframe, MITI LInear Model, MITI Non-Linear Model and Anaerobic Model (calles Biowin 1-7, respectively). Due to this results the overall prediction of readily biodegradability is done for the desired chemical.

Biowin 1 and 2, are intended to convey a general indication of biodegradability under aerobic conditions, and not for any particular medium.
Biowin 1 (Linear model)
The fast biodegradation probability for any compound is calculated by summing, for all the fragments present in that compound, the fragment coefficient multiplied by the number of instances of the fragment in the compound (for MW, the value of that parameter is multiplied by its coefficient), and then adding this summation to the equation constant which is 0.7475. The summed values for each fragment coefficient multiplied by the number of instances appear in the "VALUE" column of the linear results screen.

Biowin 2 (Non-linear model)
Calculation of the fast biodegradation probability for any compound begins by summing, for all the fragments present in that compound, the fragment coefficient multiplied by the number of instances of the fragment in the compound (for MW, the value of that parameter is multiplied by its coefficient), then adding this summation to the equation constant which is 3.0087. The summed values for each fragment coefficient multiplied by the number of instances appear in the "VALUE" column of the non-linear results screen. The non-linear fast biodegradation probability is then calculated from the logistic equation as follows, where total = 3.0087 + the summation as described above:

Biowin 3 and 4 yield estimates for the time required to achieve complete ultimate and primary biodegradation in a typical or "evaluative" aquatic environment.

Biowin 5 and 6 are predictive models for assessing a compound’s biodegradability in the Japanese MITI (Ministry of International Trade and Industry) ready biodegradation test; i.e. OECD 301C. These models use an approach similar to that used to develop Biowin1 and 2. This protocol for determining ready biodegradability is among six officially approved as ready biodegradability test guidelines of the OECD (Organization for Economic Cooperation and Development). A total dataset of 884 chemicals was compiled to derive the fragment probability values that are applied in this MITI Biodegradability method. The dataset consists of 385 chemical that were critically evaluated as "readily degradable" and 499 chemicals that were critically evaluated as "not readily biodegradable".

Biowin 7, the anaerobic biodegradation model, is the most recent. As for the other Biowin models, multiple (linear) regression against molecular fragments was used to develop the model, which predicts probability of rapid degradation in the "serum bottle" anaerobic biodegradation screening test. This endpoint is assumed to be predictive of degradation in a typical anaerobic digester. Biowin7 estimates the probability of fast biodegradation under methanogenic anaerobic conditions; specifically, under the conditions of the "serum bottle" anaerobic biodegradation screening test (Meylan et al. 2007). A total of 169 compounds with serum bottle test data were identified for use in model development.

Out of seven different Biowin models, Biowin model 3 and 4 will help in estimating biodgeradability of the test chemical which was described as below-

Ultimate Biodegradation Timeframe and Primary Biodegradation Timeframe (Biowin 3 and 4)
These two models estimate the time required for "complete" ultimate and primary biodegradation.  Primary biodegradation is the transformation of a parent compound to an initial metabolite.  Ultimate biodegradation is the transformation of a parent compound to carbon dioxide and water, mineral oxides of any other elements present in the test compound, and new cell material. Then the rating was given to each model, which indicates the time required to achieve ultimate and primary biodegradation in a typical or "evaluative" aquatic environment. The ratings for each compound were averaged to obtain a single value for modeling.  The ultimate or primary rating of a compound is calculated by summing, for all the fragments present in that compound.
Key result
Parameter:
other: Half-life
Value:
50
Sampling time:
3.205 wk
Remarks on result:
other: readily biodegradable as estimated by BIOWIN model
Details on results:
Biowin1 (Linear Model Prediction) : Biodegrades Fast : 1.1667
Biowin2 (Non-Linear Model Prediction):Biodegrades Fast : 0.9997
Biowin3 (Ultimate Biodegradation Timeframe):Weeks: 3.2053
Biowin4 (Primary Biodegradation Timeframe): Hours-Days: 4.3823
Biowin5 (MITI Linear Model Prediction) :Biodegrades Fast: 0.6598
Biowin6 (MITI Non-Linear Model Prediction): Does Not Biodegrade Fast: 0.4774
Biowin7 (Anaerobic Model Prediction): Does Not Biodegrade Fast: -0.2854
Ready Biodegradability Prediction: YES

BIOWIN (v4.10) Program Results:

==============================

SMILES : Cc1ccc(C(=O)OC(C(=O)O)C(C(=O)O)OC(=O)c2ccc(C)cc2)cc1

CHEM : Butanedioic acid, 2,3-bis[(4-methylbenzoyl)oxy]-, [S-(R*,R*)]-

MOL FOR: C20 H18 O8

MOL WT : 386.36

--------------------------- BIOWIN v4.10 Results ----------------------------

Biowin1 (Linear Model Prediction) : Biodegrades Fast

Biowin2 (Non-Linear Model Prediction): Biodegrades Fast

Biowin3 (Ultimate Biodegradation Timeframe): Weeks

Biowin4 (Primary Biodegradation Timeframe): Hours-Days

Biowin5 (MITI Linear Model Prediction) : Biodegrades Fast

Biowin6 (MITI Non-Linear Model Prediction): Does Not Biodegrade Fast

Biowin7 (Anaerobic Model Prediction): Does Not Biodegrade Fast

Ready Biodegradability Prediction: YES

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin1 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 2 | Aliphatic acid [-C(=O)-OH] | 0.0727 | 0.1454

Frag | 2 | Ester [-C(=O)-O-C] | 0.1742 | 0.3484

Frag | 2 | Alkyl substituent on aromatic ring | 0.0547 | 0.1093

MolWt| * | Molecular Weight Parameter | | -0.1839

Const| * | Equation Constant | | 0.7475

============+============================================+=========+=========

RESULT | Biowin1 (Linear Biodeg Probability) | | 1.1667

============+============================================+=========+=========

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin2 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 2 | Aliphatic acid [-C(=O)-OH] | 0.6431 | 1.2862

Frag | 2 | Ester [-C(=O)-O-C] | 4.0795 | 8.1590

Frag | 2 | Alkyl substituent on aromatic ring | 0.5771 | 1.1542

MolWt| * | Molecular Weight Parameter | | -5.4863

============+============================================+=========+=========

RESULT | Biowin2 (Non-Linear Biodeg Probability) | | 0.9997

============+============================================+=========+=========

A Probability Greater Than or Equal to 0.5 indicates --> Biodegrades Fast

A Probability Less Than 0.5 indicates --> Does NOT Biodegrade Fast

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin3 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 2 | Aliphatic acid [-C(=O)-OH] | 0.3646 | 0.7292

Frag | 2 | Ester [-C(=O)-O-C] | 0.1402 | 0.2804

Frag | 2 | Alkyl substituent on aromatic ring | -0.0749 | -0.1497

MolWt| * | Molecular Weight Parameter | | -0.8538

Const| * | Equation Constant | | 3.1992

============+============================================+=========+=========

RESULT | Biowin3 (Survey Model - Ultimate Biodeg) | | 3.2053

============+============================================+=========+=========

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin4 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 2 | Aliphatic acid [-C(=O)-OH] | 0.3856 | 0.7711

Frag | 2 | Ester [-C(=O)-O-C] | 0.2290 | 0.4579

Frag | 2 | Alkyl substituent on aromatic ring | -0.0685 | -0.1371

MolWt| * | Molecular Weight Parameter | | -0.5574

Const| * | Equation Constant | | 3.8477

============+============================================+=========+=========

RESULT | Biowin4 (Survey Model - Primary Biodeg) | | 4.3823

============+============================================+=========+=========

Result Classification: 5.00 -> hours 4.00 -> days 3.00 -> weeks

(Primary & Ultimate) 2.00 -> months 1.00 -> longer

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin5 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 2 | Aliphatic acid [-C(=O)-OH] | 0.1812 | 0.3623

Frag | 2 | Ester [-C(=O)-O-C] | 0.3437 | 0.6875

Frag | 2 | Aromatic-CH3 | 0.0415 | 0.0829

Frag | 8 | Aromatic-H | 0.0082 | 0.0657

Frag | 2 | -CH- [linear] | -0.0507 | -0.1013

MolWt| * | Molecular Weight Parameter | | -1.1494

Const| * | Equation Constant | | 0.7121

============+============================================+=========+=========

RESULT | Biowin5 (MITI Linear Biodeg Probability) | | 0.6598

============+============================================+=========+=========

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin6 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 2 | Aliphatic acid [-C(=O)-OH] | 1.1346 | 2.2692

Frag | 2 | Ester [-C(=O)-O-C] | 2.4462 | 4.8923

Frag | 2 | Aromatic-CH3 | 0.3072 | 0.6144

Frag | 8 | Aromatic-H | 0.1201 | 0.9611

Frag | 2 | -CH- [linear] | -0.0998 | -0.1995

MolWt| * | Molecular Weight Parameter | |-11.1538

============+============================================+=========+=========

RESULT |Biowin6 (MITI Non-Linear Biodeg Probability)| | 0.4774

============+============================================+=========+=========

A Probability Greater Than or Equal to 0.5 indicates --> Readily Degradable

A Probability Less Than 0.5 indicates --> NOT Readily Degradable

------+-----+--------------------------------------------+---------+---------

TYPE | NUM | Biowin7 FRAGMENT DESCRIPTION | COEFF | VALUE

------+-----+--------------------------------------------+---------+---------

Frag | 2 | Aliphatic acid [-C(=O)-OH] | 0.1868 | 0.3735

Frag | 2 | Ester [-C(=O)-O-C] | 0.1719 | 0.3437

Frag | 2 | Alkyl substituent on aromatic ring | -0.1145 | -0.2289

Frag | 2 | Aromatic-CH3 | -0.2573 | -0.5146

Frag | 8 | Aromatic-H | -0.0954 | -0.7634

Frag | 2 | -CH- [linear] | -0.1659 | -0.3317

Const| * | Equation Constant | | 0.8361

============+============================================+=========+=========

RESULT | Biowin7 (Anaerobic Linear Biodeg Prob) | | -0.2854

============+============================================+=========+=========

A Probability Greater Than or Equal to 0.5 indicates --> Biodegrades Fast

A Probability Less Than 0.5 indicates --> Does NOT Biodegrade Fast

Ready Biodegradability Prediction: (YES or NO)

----------------------------------------------

Criteria for the YES or NO prediction: If the Biowin3 (ultimate survey

model) result is "weeks" or faster (i.e. "days", "days to weeks", or

"weeks" AND the Biowin5 (MITI linear model) probability is >= 0.5, then

the prediction is YES (readily biodegradable). If this condition is not

satisfied, the prediction is NO (not readily biodegradable). This method

is based on application of Bayesian analysis to ready biodegradation data

(see Help). Biowin5 and 6 also predict ready biodegradability, but for

degradation in the OECD301C test only; using data from the Chemicals

Evaluation and Research Institute Japan (CERIJ) database.

Validity criteria fulfilled:
not specified
Interpretation of results:
readily biodegradable
Conclusions:
The biodegradability of the substance 2,3-bis[(4-methylbenzoyl)oxy]succinic acid (CAS no. 32634-68-7)was calculated using seven different Biowin 1-7 models of the BIOWIN v4.10 software. The results indicate that the test chemical is expected to be readily biodegradable.
Executive summary:

Estimation Programs Interface Suite (EPI suite, 2018) was run to predict the biodegradation potential of the test compound 2,3-bis[(4-methylbenzoyl)oxy]succinic acid (CAS no. 32634 -68 -7) 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 chemical   2,3-bis[(4-methylbenzoyl)oxy]succinic acid is expected to be readily biodegradable.

Description of key information

Estimation Programs Interface Suite (EPI suite, 2018) was run to predict the biodegradation potential of the test compound 2,3-bis[(4-methylbenzoyl)oxy]succinic acid (CAS no. 32634 -68 -7) 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 chemical 2,3-bis[(4-methylbenzoyl)oxy]succinic acid is expected to be readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Predicted data study for target chemical 2,3-bis[(4-methylbenzoyl)oxy]succinic acid (CAS no. 32634 -68 -7) and experimental studies for its read across chemical have been conducted and their results are summarized below.

 

The first study was predicted data study in this study the Estimation Programs Interface Suite (EPI suite, 2018) was run to predict the biodegradation potential of the test compound 2,3-bis[(4-methylbenzoyl)oxy]succinic acid (CAS no. 32634 -68 -7) 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 chemical 2,3-bis[(4-methylbenzoyl)oxy]succinic acid is expected to be readily biodegradable.

 

Next study was experimental study reviewed from peer reviewed journal (1955) in this study an experiment was performed to determine BOD 5 value of test chemical by using O2 uptake BOD as parameter and warburg respirometry method at 25 oC. The BOD 5 value of test chemical was observed to be 0.30gO2/g by considering this value percent degradation obtained was 57 % in 5 days. On the basis of percent degradability test chemical is considered to be readily biodegradable in nature.

 

Another experimental study was reviewed from authoritative database in this study the test chemical was subjected to biodegradation test by taking activated sludge as inoculums at 30 mg/L concentration. Biodegradation was analysed by using three parameters namely BOD, TOC and HPLC. The initial concentration of test chemical was 100 mg/L. The test chemical showed 76 % biodegradability by BOD parameter 100 % by TOC and HPLC parameter by using activated sludge as inoculums in 14 days. On the basis of percent biodegradability it is concluded that test chemical is readily biodegradable.

 

On the basis of results of all the studies mentioned above it can be concluded that test chemical 2,3-bis[(4-methylbenzoyl)oxy]succinic acid (CAS no. 32634 -68 -7) is readily biodegradable in nature.