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首页> 外文期刊>Environmental toxicology and chemistry >TRANSFORMATION OF BENZONITRILES IN ANAEROBIC SEDIMENT AND IN SEDIMENT EXTRACT
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TRANSFORMATION OF BENZONITRILES IN ANAEROBIC SEDIMENT AND IN SEDIMENT EXTRACT

机译：厌氧沉积物中和提取物中苯甲腈的转化

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Transformations of para-substituted benzonitriles in sediment and in sediment extract were studied. In raw anaerobic sediment, most of the benzonitriles were transformed to benzoic acids without benzamide intermediates. Very slow disappearance of benzonitrile in autoclave-sterilized sediment was explained by the chemical hydrolysis, while relatively rapid decrease in γ-irradiation-sterilized sediment indicated another abiotic mechanism. Hence, extracted protein fraction from sediment active against benzonitrile was surveyed. The obtained active fraction transformed para-substituted benzonitriles to corresponding benzoic acids without any intermediates, which resembled reported nitrilase enzyme activity. Quantitative structure-reactivity relationship (QSRR) analyses of para-substituted benzonitrile transformation-rate constants in raw sediment and in sediment extract fraction indicated that both of them had some correlation with hydrophobicity. This contrasted with the chemical hydrolysis of these compounds, which was controlled by electronic substituent constant (Hammett σ_p). This was an encouraging sign that the obtained sediment extract fraction is possibly responsible at least for part of the reaction in raw sediment. Various reaction mechanisms are present for degradation of xenobiotics in anaerobic sediment. This study presented the possible abiotic mechanism attributable to protein fraction in sediment. Further studies are necessary to understand the total reaction mechanisms in aquatic sediment.
机译：研究了对位取代的苄腈在沉淀物中和沉淀物中的转化。在原始的厌氧沉积物中，大多数苯甲腈都转化为苯甲酸，而没有苯甲酰胺中间体。高压灭菌后的沉积物中苯甲腈的消失非常缓慢，这可通过化学水解来解释，而γ-射线灭菌后的沉积物中相对较快的减少表明了另一个非生物机制。因此，调查了从对苯甲腈具有活性的沉积物中提取的蛋白质部分。所获得的活性级分将对位取代的苄腈转化为相应的苯甲酸，而没有任何中间体，其类似于报道的腈水解酶活性。原始沉积物和沉积物提取物级分中对位取代的苯甲腈转化率常数的定量结构-反应关系（QSRR）分析表明，二者均与疏水性相关。这与这些化合物的化学水解相反，后者受电子取代基常数（Hammettσ_p）控制。这是一个令人鼓舞的迹象，表明所获得的沉淀物提取物馏分可能至少对原始沉淀物中的部分反应负责。存在用于降解厌氧沉积物中的异源生物的各种反应机理。这项研究提出了可能归因于沉积物中蛋白质含量的非生物机制。需要进一步的研究来了解水生沉积物中的总反应机理。

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