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Estimation of n-octanol/water partition coefficients (logKOW) of polychlorinated biphenyls by using quantum chemical descriptors and partial least squares
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نویسنده
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zhang f.-l. ,yang x.-j. ,xue x.-l. ,tao x.-q. ,lu g.-n. ,dang z.
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منبع
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journal of chemistry - 2013 - دوره : 2013 - شماره : 0
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چکیده
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The n-octanol/water partition coefficient (log k ow) is a useful parameter for the assessment of the environmental fate and impact of xenobiotic trace contaminants. quantitative structure-activity relationship (qsar) model for log k ow of polychlorinated biphenyls (pcbs) was analyzed by using the density functional theory at b3lyp/6-31g(d) level and the partial least squares (pls) method with an optimizing procedure. a pls model with reasonably good coefficient (r 2 = 0.992) and cross-validation test (q 2 cum = 0.988) values was obtained. all the predicted values are within the range of ± 0.3 log unit from the observed values. the log k ow values of 7 pcbs in the test set predicted by the model are very close to those observed,indicating that this model has high fitting precision and good predictability. the pls analysis showed that pcbs with larger electronic spatial extent and lower molecular total energy values tend to be more hydrophobic and lipophilic. © 2013 fang-li zhang et al.
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آدرس
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school of environment and energy,south china university of technology, China, school of environment and energy,south china university of technology, China, college of chemical engineering,huaqiao university, China, school of environmental science and engineering,zhongkai university of agriculture and engineering, China, school of environment and energy,south china university of technology,guangzhou 510006,china,guangdong provincial key laboratory of atmospheric environment and pollution control, China, school of environment and energy,south china university of technology,guangzhou 510006,china,key lab of pollution control and ecosystem restoration in industry clusters,ministry of education, China
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Authors
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