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QSARS for acute toxicity of halogenated benzenes to bacteria in natural waters / 生物医学与环境科学(英文)
Biomedical and Environmental Sciences ; (12): 457-460, 2006.
Artigo em Inglês | WPRIM | ID: wpr-249902
ABSTRACT
<p><b>OBJECTIVE</b>To measure the acute toxicity of halogenated benzenes to bacteria in natural waters and to study quantitative relationships between the structure and activity of chemicals.</p><p><b>METHODS</b>The concentration values causing 50% inhibition of bacteria growth (24h-IC50) were determined according to the bacterial growth inhibition test method. The energy of the lowest unoccupied molecular orbital and the net charge of carbon atom of 20 halogenated benzenes were calculated by the quantum chemical MOPAC program.</p><p><b>RESULTS</b>The log1/IC50 values ranged from 4.79 for 2,4-dinitrochlorobenzene to 3.65 for chlorobenzene. A quantitative structure-activity relationship model was derived from the toxicity and structural parameters log1/IC50 = -0.531(E(LUMO)) + 1.693(Qc) + 0.163(logP) + 3.375. This equation was found to fit well (r2 = 0.860, s = 0.106), and the average percentage error was only 1.98%.</p><p><b>CONCLUSION</b>Halogenated benzenes and alkyl halogenated benzenes are non-polar narcotics, and have hydrophobicity-dependent toxicity. The halogenated phenols and anilines exhibit a higher toxic potency than their hydrophobicity, whereas 2,4-dinitrochlorobenzene is electrophile with the halogen acting as the leaving group.</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Poluentes Químicos da Água / Benzeno / Química / Testes de Toxicidade Aguda / Relação Quantitativa Estrutura-Atividade / Rios / Aliivibrio fischeri / Toxicidade / Halogênios / Microbiologia Idioma: Inglês Revista: Biomedical and Environmental Sciences Ano de publicação: 2006 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Poluentes Químicos da Água / Benzeno / Química / Testes de Toxicidade Aguda / Relação Quantitativa Estrutura-Atividade / Rios / Aliivibrio fischeri / Toxicidade / Halogênios / Microbiologia Idioma: Inglês Revista: Biomedical and Environmental Sciences Ano de publicação: 2006 Tipo de documento: Artigo