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Title Structural requirements for anaerobic biodegradation of organic chemicals: A fragment model analysis
Creator/Author Rorije, E. ; Peijnenburg, W.J.G.M. [National Inst. of Public Health and the Environment, Bilthoven (Netherlands). Lab. for Ecotoxicology] ; Klopman, G. [Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Chemistry]
Publication Date1998 Oct 01
OSTI IdentifierOSTI ID: 290162
Other Number(s)ETOCDK; ISSN 0730-7268
Resource TypeJournal Article
Resource RelationEnvironmental Toxicology and Chemistry ; VOL. 17 ; ISSUE: 10 ; PBD: Oct 1998
Subject54 ENVIRONMENTAL SCIENCES ; BIODEGRADATION; ANAEROBIC CONDITIONS; STRUCTURE-ACTIVITY RELATIONSHIPS; M CODES; MATHEMATICAL MODELS; FORECASTING; THIOLS
Description/Abstract A computer-automated structure evaluation program (MCASE) has been used to analyze rates of aquatic anaerobic biodegradation of a set of diverse organic compounds, and a predictive model for this endpoint has been developed. The model was evaluated in terms of possible anaerobic metabolic steps. The most important fragments linked to biodegradability (biophores) were aromatic and aliphatic thiol, methoxy, and alcohol groups and the carboxylic ester group. Fragments that can possibly inhibit anaerobic biodegradation were also identified but were not significant. A metabolic transformation step is proposed for all identified fragments. Their results are therefore such that the most likely transformation under anaerobic conditions is anticipated when biophores are present in the molecule, while nonbiodegradability is assumed when none of these fragments are present. The number of correct classifications by the model is over 93%. When predictions for all compounds were generated using cross-validation of the model, 84% of the overall predictions were correct. However, when only the predictions of possible biodegradability under anaerobic conditions are considered, the number of correct predictions is over 89%, whereas the percentage of correct predictions for nonbiodegradability is only 64%. It is therefore concluded that the analysis given in this contribution yields a model that can predict anaerobic biodegradability, but the assumption that the absence of a biophore leads to nonbiodegradability is not valid. Predictions of nonbiodegradability of compounds are therefore unreliable, probably due to the limited amount of data on anaerobic biodegradation available for use in this study.
Country of PublicationUnited States
LanguageEnglish
Formatpp. 1943-1950 ; PL:
System Entry Date2001 May 04

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